SUSY10

23 Aug 2010, 08:00 → 28 Aug 2010, 18:00 Europe/Berlin

Bonn

18th International Conference on Supersymmetry and Unification of Fundamental Interactions

Slides juste.ppt

Monday, 23 August

09:00 → 09:30 Search for New Phenomena at the Tevatron, J. Strologas

Plenary talk
Chair: H. Baer

slides strologas.pdf

09:30 → 10:00 Higgs Searches at the Tevatron, A. Juste

Plenary talk
Chair: H. Baer

slides juste.ppt

10:10 → 10:40 Technicolor and Beyond: Unification in Theory Space, F. Sannino

Plenary talk
Chair: H. Baer

slides Sannino-SUSY-2010.pdf

10:45 → 11:15 Coffee break

11:15 → 11:45 Flavour and SUSY in Local String Models, F. Quevedo

Plenary talk
Chair: A. Klemm

slides quevedo-SUSY2010.pdf

11:50 → 12:20 Strings at the LHC, S. Stieberger

Plenary talk
Chair: A. Klemm

slides stieberger.pdf

12:25 → 12:55 Gauge Theories as Curved Spacetimes, I. Klebanov

Plenary talk
Chair: A. Klemm

slides SUSY-Klebanov.pdf

13:00 → 14:00 LUNCH

14:00 → 15:42 Collider 23-1 Chair: H. Dreiner

14:00 Stop Reconstruction with Tagged Tops

At the LHC, combinatorics make it unlikely that we will be able to observe stop pair production with a decay to a semileptonic top pair and missing energy. Using a Standard-Model top tagger on fully hadronic top decays we can not only extract the stop signal but also measure the top momentum. To illustrate the promise of tagging tops with moderate boost we include a detailed discussion of our fat-jet algorithm.

Speaker: Dr Michihisa Takeuchi (Institut f. Theoretische Physik Heidelberg)

Slides SUSY10_Takeuchi.pdf

14:17 New measurement of the B0_s mixing phase at CDF

CDF presents improved bounds on the CP-violating phase beta_s and on the decay-width difference DeltaGamma_s of the neutral B0_s meson system. We use 6500 B0_s --> J/psi phi decays collected by the dimuon trigger and reconstructed in a sample corresponding to 5.2 fb^{-1} of data. Besides exploiting a two-fold increase in statistics with respect to the previous measurement, several improvements have been introduced in the analysis including a fully data-driven flavor-tagging calibration and proper treatment of possible S-wave contributions.

Speaker: Dr Martin Heck (KIT)

Slides HECK_ODP.odp HECK_PDF.pdf

14:34 Search for a low mass standard model Higgs boson in ppbar collisions at sqrt(s)=1.96 TeV

We present a search for a low mass standard model Higgs boson in proton-antiproton collisions at a center-of mass energy of 1.96 TeV with the D0 detector at the Fermilab Tevatron collider. The search is performed using the associated production of the Higgs boson with a W or a Z boson which decay, resulting in final state with one or two b-tagged jets in association with either two charged leptons, one leptons plus missing transverse energy or just missing transverse energy. We also present a combination of these searches with those exploiting the decay of the Higgs boson in tau pairs and photon pairs. Recent improvements to the sensitivity of these searches, including the extension to the full dataset corresponding to an integrated luminosity of 6.7 fb-1, will also be discussed.

Speaker: Dr Kwok Ming Chan (University of Notre Dame)

Slides susy10_low_mass_higgs_leo_v3.pdf

14:51 Search for neutral supersymmetric Higgs bosons in bbb(b) final states in ppbar collisions at sqrt(s)=1.96 TeV

We present a search for Higgs bosons in bh(-->bb) and bbh(-->bb) channels at a center-of-mass energy of 1.96 TeV using up to 6.3 fb-1 opf data collected with the D0 detector at the Fermilab Tevatron collider. In many supersymmetric models the cross-section for the production of neutral Higgs bosons in association with bottom quarks is greatly enhanced compared to the standard model and over much of the parameter space the dominant decayu process is h-->bbar. We search for an excess of events above the multijet background in events with 3 and 4 b-tagged jets. Understanding the multijet background in this channel is particularly challenging. The treatment of the background, the multivariate techniques used to improved the sensitivity and the limit setting procedure are discussed.

Speaker: Dr Fabrice Couderc (CEA)

Slides Fabrice_SUSY2010_MSSMhiggsDzero.pdf

15:08 Searches for physics beyond the standard model in final states with long lived particles.

Using 5.4 fb-1 of data from ppbar collisions at sqrt(s)=1.96 TeV recorded with the D0 detector at the Fermilab Tevatron collider we investigate various models of new physics using final states with new long-lived particles. We investigate models in which charged massive long-lived particles are pair produced, as well as models in which a single heavy ionizing state is observed in the detector. Such state could arise as the bound state of pairs of new fermions bound by a new SU(N) "infracolor" gauge coupling (quirks). We also investigate models in which relatively light particles exist in a "potential valley" separated from the standard model by a high potential barrier. This barrier could be crossed leading to the production of hidden valley particles which could decay to standard model particles after moderately short lifetimes. Results from multiple searches for hidden valley particles will be presented.

Speaker: Dr Sudeshna Banerjee (Tata Institute of Fundamental Research)

Slides banerjee-SUSY10_long_lived.pdf

15:25 Composite Higgs Search at the LHC

One of the major goals at the LHC will be the search for Higgs boson(s). Once found, ambitious measurements and analyses will have to be performed in order to establish experimentally the Higgs mechanism as being responsible for the creation of particle masses without violating gauge principles. I will present the composite Higgs model as a possible alternative to the elementary Higgs picture. In this model the Higgs boson emerges as composite bound state from a strongly interacting sector. It is identified with the pseudo-Goldstone boson of a global symmetry G of the strong sector which is spontaneously broken down to a subgroup H. Its couplings to matter and gauge particles are modified with respect to the Standard Model Higgs couplings. After a discussion of the bounds from electroweak precision data and direct Higgs boson searches at LEP and Tevatron, the modifications in Higgs boson production and decay channels and their implication for Higgs discovery at the LHC will be presented. They turn out to be significant for certain values of the parameters.

Speaker: Dr Margarete Mühlleitner (ITP Karlsruhe)

Slides muhlleitner.pdf

14:00 → 15:42 Formal 23-1 Chair: T. Grimm

14:00 More on Dimension-4 Proton Decay Problem in F-theory

Recently, supersymmetric compactifications of F-theory have been considerably studied for the construction of realistic GUT models in string theory. In supersymmetric compactifications for realistic models, dimension-4 proton decay operators have to be brought under control. So-called factorized spectral surface scenario, which uses an U(1) symmetry to forbid dimension-4 proton decay operators, has been considered as one of solutions to the dimension-4 proton decay problems in F-theory. However, the factorized spectral surface scenario is not without a theoretical concern. In this talk, I will discuss whether the U(1) symmetry in such a scenario is maintained or not in global F-theory compactifications and show that it is generally broken and dimension-4 proton decay operators are likely to be generated in a simple factorized spectral surface scenario. I will also present a list of chances to save the scenario.

Speaker: Hirotaka Hayashi (The University of Tokyo)

Slides hayashi_susy2010.pdf

14:17 Heterotic Z7 Orbifold and its Blowup

Heterotic String Theory compactified on Orbifolds provides exactly solvable models in 4D. Smooth Calabi-Yau compactifications obtained as deformations of some T6/Z7 orbifolds are studied by adding abelian gauge fluxes, which break the original E8xE8 gauge symmetry of the Heterotic Supergravity Action in 10D. We present two blow up models with the gauge group of the SM: One comming from an SM-like orbifold model, and the other being a blow up of an orbifold model with E6-gauge symmetry.

Speaker: Ms Nana Cabo Bizet (University Bonn)

Slides cabo-bizet-susy10NGCBOK.pdf

14:34 Supersymmetric Fully Localized Intersecting D-brane Systems

We construct supersymmetric fully localized intersecting D-brane systems by reducing down the new M2 and M5 solutions based on embedding self-dual geometries lifted to M-theory. One novel feature of M-brane solutions is that the metric functions depend on two and more than two transverse coordinates. All the D-brane systems have eight preserved supersymmetries.

Speaker: Prof. Amir Ghezelbash (University of Saskatchewan)

Slides Susy10-Aug-23-10-ghezelbash.ppt

14:51 Phenomenology of D-branes at toric singularities

We discuss general properties of D-brane model building at toric singularities. Using dimer techniques to obtain the gauge theory from the structure of the singularity, we extract results on the matter sector and superpotential of the corresponding gauge theory. We show that the number of families in toric phases is always less than or equal to three, with a unique exception being the zeroth Hirzebruch surface. With the physical input of three generations we find that the lightest family of quarks is massless and the masses of the other two can be hierarchically separated. We compute the CKM matrix for explicit models in this setting and find the singularities possess sufficient structure to allow for realistic mixing between generations and CP violation.

Speaker: Mr Sven Krippendorf (DAMTP, University of Cambridge)

Slides krippendorfsusy2010a.pdf

15:08 Matching of singular and resolved Orbifolds

We present recent developments on matching singular heterotic orbifolds with their smooth (resolved) counterparts. The results are illustrated at a Z_2 x Z_2 heterotic orbifold MSSM with an additional freely acting Z_2.

Speaker: Dr Patrick Vaudrevange (LMU München)

Slides Vaudrevange.pdf

15:25 On low-energy effective actions in three-dimensional N=4 and N=8 supergauge models

We study the general structure of effective actions for N=2, N=4 and N=8 three-dimensional gauge theories in the N=2, d=3 superspace. We compute the one-loop contributions to the effective actions in these models and express them in terms of superconformal invariants. Some aspects of duality for the obtained effective actions are clarified.

Speaker: Dr Igor Samsonov (Tomsk Polytechnic University)

Slides Samsonov.pdf

14:00 → 15:42 Model Building Chair: A. Dedes

14:00 Supersymmetry with extra vector-like matter

I will discuss the motivations and phenomenology of supersymmetry with extra vector-like matter, including corrections to the Higgs mass, precision electroweak constraints, and collider constraints and signatures.

Speaker: Prof. Stephen Martin (Northern Illinois University)

Slides smartin.pdf.pdf

14:17 The Phenomenology of E6-inspired SUSY GUTs

We discuss the low-energy phenomenology of E6-inspired SUSY GUTs with an intermediate-scale breaking. These models have TeV scale exotic particles beyond the MSSM like a Z' boson and leptoquark states. Our focus lies on the investigation of the parameter space of these models, the specifics of their spectra as well as their possible LHC phenomenology. We especially discuss the search and discrimination of the scalar leptoquarks. For their fermionic superpartners, the leptoquarkinos, interesting search modes show up in several kinds of potential decay cascades.

Speaker: Alexander Knochel (University of Freiburg)

Slides knochel.pdf

14:34 Reconstruction of the cE6SSM parameters from LHC data.

The constrained Exceptional Supersymmetric Standard Model (cE6SSM) is an E6 inspired model, where the matter content fills three generations of E6 multiplets at low energies (predicting exciting exotic matter such as diquarks or leptoquarks) and has a universal scalar mass m0 , trilinear mass A and gaugino mass M1/2 at the GUT scale. If some or all of these particles are discovered at the LHC we will want to perform cE6SSM hypothesis tests and/or reconstruct the fundamental cE6SSM parameters from our low energy data. It is therefore important that a link between the GUT scale parameters and the physics at low energies is made. We will review phenomenological predictions of the model, present typical mass spectra which may be observed and provide important corrections which have previously been neglected, specifically individual sparticle threshold corrections to dimensionless couplings, and discuss the impact they have.

Speaker: Dr Peter Athron (TU Dresden)

Slides Athron_Susy2010.pdf Athron_Susy2010.pptx

14:51 Minimal Supersymmetric SU(5) and Gauge Coupling Unification at Three Loops

We consider the relations between the gauge couplings at the electroweak scale and the high scale where unification of the three gauge couplings is expected. Threshold corrections are incorporated both at the supersymmetric and at the grand unified scale and, where available three-loop running and two-loop decoupling are employed. We study the impact of the current experimental uncertainties of the coupling constants and the supersymmetric mass spectrum on the prediction of the super-heavy masses within the so-called minimal supersymmetric SU(5) and also of the missing doublet model.

Speaker: Mr Waldemar Martens (Institut für Theoretische Teilchenphysik (KIT))

Slides martens.pdf.pdf

15:08 Cascade Textures in SUSY GUT

We study cascade textures in supersymmetric grand unified theories. The neutrino Dirac mass matrix of the cascade form can lead the tri-bimaximal generation mixing at the leading order in the seesaw mechanism while the down quark mass matrix of a hybrid cascade form naturally gives the CKM structure. We embed such experimentally favored mass textures into SUSY GUT, which gives relations between the quark and lepton mass matrices. The related phenomenologies, such as the lepton flavor violating processes and leptogenesis, are also investigated in addition to the lepton mixing angles.

Speaker: Dr Ryo Takahashi (MPIK)

Slides R-Takahashi.pdf

15:25 Towards MSSM from F-theory

We describe the SU(3)xSU(2)xU(1)_Y gauge theory without resorting to an intermediate unification group. Its group is the commutant to a structure group SU(5) x U(1)_Y of a gauge bundle in E_8. The spectrum contains three generations of quarks and leptons plus vectorlike electroweak and colored Higgses. The minimal MSSM Yukawa couplings with matter parity is obtained at the renormalizable level.

Speaker: Dr Kang Sin Choi (Kyoto University)

Slides 10susy.pdf

14:00 → 15:42 Phenomenology 23-1 Chair: K. Matchev

14:00 HiggsBounds: Using results from the Higgs searches at LEP and the Tevatron to constrain extensions to the Standard Model

The limits from Higgs searches at LEP and the Tevatron play an important role in constraining extensions to the Standard Model, and will need to be taken into account in the interpretation of any new physics observed at the LHC. HiggsBounds is a Fortran code which facilitates this task. It uses the expected and observed topological cross section limits from the charged and neutral Higgs searches at LEP and the Tevatron to determine whether a parameter point has already been excluded at 95% CL. We show the results in a variety of MSSM scenarios.

Speaker: Dr Karina Williams (University of Bonn)

Slides susytalk1.pdf

14:17 Comparison of Mass Determination methods at the LHC

In this talk, I report on the comparison of different mass determination methods for BSM scenarios with heavy initial cascade particles and long subsequent decay chains. For any BSM theory, the underlying particle mass spectrum will be among the first available information on the new physics involved. A multitude of techniques is currently available to determine the masses of new particles in these models from measured data. In our study, different mass determination variables have been applied to a common SUSY event sample, generated including a generic collider detector simulation. I comment on advantages and drawbacks of the methods which were investigated in our analysis.

Speaker: Dr Tania Robens (Department of Physics and Astronomy, University of Glasgow)

Slides trobens_masses.pdf

14:34 Incorporating Event Rates Into MSSM Parameter Determinations

The LHC could provide many observables from which the parameters of the MSSM can be determined. Technical difficulties in accommodating experimental cuts as well as large theoretical uncertainties have led to absolute rates of SUSY signal events being ignored in favor of more easily-measured observables such as kinematic edges. In this talk, I present a code which calculates a fast approximation and how incorporating this into Fittino allows for more accurate determination of SUSY parameters with early LHC data.

Speaker: Dr Ben O'Leary (RWTH Aachen University and Bonn University)

Slides O'Leary-talk.pdf

14:51 Measuring Unification

If supersymmetry is observed at the LHC, the parameters of the MSSM will be measured at the electroweak scale. Using SPS1a as an example, the expected precision on the parameter determination, including a proper treatment of experimental and theoretical errors, is discussed. Particular attention is paid to the question of degenerate solutions at the LHC. Using the SFitter framework a full bottom-up reconstruction of the unified parameters at the unification scale is performed with a full propagation of all errors. The difference between the MSSM and the high scale MSSM parameter determination is analyzed in detail. Talk based on arXiv:1007.2190

Speaker: Mrs Claire Adam (LAL, IN2P3/CNRS, Orsay, France)

Slides Adam-MeasuringUnification.pdf

15:08 Spin Discrimination in Three-Body Decays

The identification of the correct model for physics beyond the Standard Model requires the determination of the spin of new particles. We investigate to which extent the spin of a new particle $X$ can be identified in scenarios where this particle decays dominantly via three-body decays $X\rightarrow f\overline{f} Y$ where we assume that all intermediate particles are heavy and the particle $Y$ is a candidate for dark matter and escapes direct detection at a high energy collider such as the LHC. We develop a model-independent strategy based on the invariant mass distribution of the two SM-fermions $m_{ff}^2$ and show how spin assignments for $X$ and $Y$ can be supported or excluded independent of the couplings.

Speaker: Lisa Edelhäuser (Uni Würzburg)

Slides edelhäuser-talk.pdf

15:25 Supersymmetric Spins in Cascade Decays

If supersymmetry is discovered at the LHC, the first task will be to determine the mass spectrum, and to this end Susy Cascade decays would prove extremely useful. However, in order to prove that the model really is supersymmetry, one must measure not only the masses of the new states, but their spins as well. In this talk I will discuss the determination of these superpartner spins using cascade decays and the measured masses as inputs.

Speaker: Dr David Miller (University of Glasgow)

Slides DMiller_susy2010.pdf

15:42 → 16:12 Coffee break

16:12 → 18:12 Collider 23-2 Chair: J. Conley

16:12 Analysis of a Multi-Muon Signal at Collider and Fixed-Target Experiments

We examined an until now unexplained CDF measurement of multi-muon events (arXiv:0810.5357v2). We investigate whether similar events could (and should) have been seen in already completed experiments. The bulk of the CDF data can be reproduced by a simple model; a correct description of events with more than two muons requires a more complicated model. We conclude that the CDF measurement is (at least partly) wrong.

Speaker: Mr Nicki Bornhauser (University of Bonn)

Slides Bornhauser_Susy10.pdf

16:46 Searches for physics beyond the standard model in final states with two leptons and jets with the D0 detector

Using 5.4 fb-1 of data from ppbar collisions at sqrt(s)=1.96 TeV recorded with the D0 detector at the Fermilab Tevatron collider we investigate various models of new physics using final states with two leptons (either pairs of charged leptons, or single lepton final states with missing transverse momentum from neutrinos) and one or two jets. The searches are used to set limits on the production cross section for resonances decaying into WZ pairs, leptoquarks, vector quarks and technicolor models. We also consider, for the first time, cases in which the highly boosted decay products of a weak boson are observed in the detector as a single jet with large mass.

Speaker: Prof. Sudeshna Banerjee (Tata Institute of Fundamental Research)

Slides SUSY10_lepton_jets_full.pdf

17:03 Searches in Same-Charge Dilepton Events and Searches for Supersymmetry Using the Triplepton Signature at CDF

We study same-charge dilepton events in the CDF Run II data sample using up to 5/fb of integrated luminosity collected at the Fermilab Tevatron. These events are rare in the standard model and could indicate new physics processes such as chargino-neutralino production in supersymmetric models. We adopt a model-independent approach and compare the yields and kinematics of events containing an electron or muon and another charged lepton (including taus) to the standard model.

Speaker: Prof. Maxwell Chertok (UC Davis)

Slides chertok-SUSY2010.pdf

17:20 Searches for Squarks and Gluinos in Jets and Missing Energy Final States at CDF

We present results on searches for squarks and gluinos in proton-antiproton collisions in Run II at the Tevatron. Events containing jets of hadrons and large missing transverse energy in the final state are studied and compared to standard model predictions. In addition to inclusive multijet final states, events containing b-tagged and c-tagged jets are studied in order to enhance the sensitivity to final states containing the third-generation scalar top and scalar bottom supersymmetric partners. Data samples corresponding to up to 3/fb of integrated luminosity are used. MSSM scenarios are employed to interpret the results and set mass limits.

Speaker: Dr Gianluca De Lorenzo (IFAE)

Slides de_lorenzo-MET_Jets_gdl.pdf

17:37 Searches for supersymmetry in ppbar collisions at sqrt(s) = 1.96 TeV with the D0 detector

We present the result of various searches for the production of supersymmetric particles in ppbar collisions at sqrt(s)=1.96 TeV using 5.4 fb-1 of data collected with the D0 detector at the Fermilab Tevatron collider. We search for the pair production of the supersymmetric partner of the bottom quarks in final states with two b-tagged jets and missing transverse momentum, for sneutrinos produced in R-parity violating models using their decays into electron-muon pairs and for final states with two photons and missing transverse momentum which could arise in gravity mediates SUSY breaking scenarios. The latter search is also interpreted inm models with extra dimensions. In all cases the results presented set the most stringent limits on new physics in these models.

Speaker: Dr Mark Cooke (Fermilab)

Slides mcooke_SUSY10.pdf

17:54 Dirac Neutralinos, Charginos and Electroweak Scalar Bosons of N=1/N=2 Hybrid Supersymmetry at Colliders

In the N=1 supersymmetric extension of the Standard Model, neutralinos associated in supermultiplets with the neutral electroweak gauge and Higgs bosons are, as well as gluinos, Majorana fermions. They can be paired with the Majorana fermions of novel gaugino/scalar supermultiplets, as suggested by extended N=2 supersymmetry, to Dirac particles. Matter fields are not extended beyond the standard N=1 supermultiplets in N=1/N=2 hybrid supersymmetry to preserve the chiral character of the theory. Complementing earlier analyses in the color sector, central elements of such an electroweak scenario are discussed in the present talk. The decay properties of the Dirac fermions and of the scalar bosons are worked out, and the single and pair production channels of the new particles are described for proton collisions at the LHC and linear colliders.

Speaker: Prof. Seong Youl Choi (Chonbuk National University)

Slides susy10_sychoi-1.pptx

16:12 → 18:11 Formal 23-2 Chair: I. Klebanov

16:12 Heterotic MSSM on a Resolved Orbifold

We construct an MSSM with three generations from the heterotic string compactified on a smooth 6D internal manifold using Abelian gauge fluxes only. The compactification space is obtained as a resolution of the T6/Z2×Z2×Z2,free orbifold. The Z2,free involution of such a resolution breaks the S U(5) GUT group down to the SM using a suitably chosen Wilson line. Surprisingly the spectrum on a given resolution is larger than that on the corresponding orbifold taking into account the branching and Higgsing due to the blow-up modes. The existence of extra resolution states is closely related to the fact that the resolution procedure is not unique, rather the various resolutions are connected to each other by flop transitions.

Speaker: Prof. Stefan Groot Nibbelink (ASC, LMU)

Slides susy10.pdf

16:29 Monte Carlo simulation of Wilson loop operator in N=4 Super Yang-Mills theory

We numerically compute the vacuum expectation value (VEV) of the BPS Wilson loop operator in 4 dimensional planar N=4 Super Yang-Mills theory. Since it is difficult to keep supersymmetries in the lattice theory, we use an alternative regularization based on an idea of the large N reduction. Using this new regularization, one can keep SU(2|4) symmetry which contains 16 supersymmetries. We perform a Monte Carlo simulation based on this method to compute VEV of circular and rectangular Wilson loop operators. We also compare the result with the gravity side to test the AdS/CFT correspondence.

Speaker: Dr Goro Ishiki (CQUeST (Sogang University))

Slides SUSY10.pdf

16:46 Maximally Non-Abelian Vortices from Self-dual Yang--Mills Fields

A particular dimensional reduction of SU(2N) Yang-Mills theory on Sigma x S^2, with Sigma a Riemann surface, yields an S(U(N) x U(N)) gauge theory on Sigma, with a matrix Higgs field. The SU(2N) self-dual Yang--Mills equations reduce to Bogomolny equations for vortices on Sigma. These equations are formally integrable if Sigma is the hyperbolic plane, and we present a subclass of solutions.

Speaker: Prof. Norisuke Sakai (tokyo woman's christian university)

Slides nsakai100823bonn.pdf

17:03 7D Super-Yang-Mills Theory in N=1 Superfields

I present a formulation of seven-dimensional super-Yang-Mills theory in N=1 superfields and outline some applications.

Speaker: Dr Christoph Lüdeling (Uni Bonn)

Slides luedeling.pdf

17:20 Globally and Locally Supersymmetric Effective Theories for Light Fields

We study how and under which conditions heavy fields can be integrated out in a supersymmetric way in globally and locally supersymmetric theories. We argue that to neglect higher-derivatives compatibly with supersymmetry one has to require that also fermions and auxiliary fields are small in unit of the heavy fields mass scale. In supergravity theories this means in particular that the gravitino mass must be small. We show then that under these assumptions, heavy chiral and vector multiplets can be integrated out at the superfield level by imposing stationarity respectively of the superpotential and the Kahler potential, both in globally and locally supersymmetric theories.

Speaker: Mr Leonardo Brizi (EPFL, Lausanne)

Slides Brizi.pdf

17:37 Vacuum distribution and tuning for F-type SUSY breaking

Using the effective field theory method, the vacuum distribution with respect to the SUSY breaking scale and cosmological constant is obtained from general F-type SUSY breaking models. There is always a parameter region where a metastable vacuum exists. By inserting mass scales to the superpotential and Kahler potential, The amount of tuning is obtained in general cases.

Speaker: Mrs Zheng Sun (Tata Institute of Fundamental Research)

Slides SUN_ZHENG_SUSY10.pdf

17:54 N=2 instanton effective action in Omega-background from superstrings

We derived the instanton effective action of N=2 super Yang-Mills theory deformed by generic Omega-background. In the string theory context, the instanton effective action is computed as the D-instanton moduli effective action of fractional D3/D(-1)-brane system and Omega-background deformation to the instanton effective action can be realized as the effect of appropriate constant RR 3-form background. We also obtained the deformed supersymmetry of the deformed instanton effective action, which is interpreted as the BRST operator of the action.

Speaker: Mr Takuya Saka (Tokyo Institute of Technology)

Slides SUSY10_saka.pdf

16:12 → 18:11 Model Building 23-2 Chair: K. Choi

16:12 Non-standard supersymmetric spectra in gauge mediation

The experimental signatures of supersymmetric extensions of the Standard Model, such as the Minimal Supersymmetric Standard Model (MSSM), depend on the actual spectrum of superpartners, which in turn is determined by the mechanism responsible for the breaking of supersymmetry and for its mediation to the MSSM. An attractive possibility, known as gauge mediation, is that supersymmetry breaking be transmitted by gauge interactions through loops of messenger fields. In this talk, I will discuss the possibility that the messenger fields couple to the Higgs multiplets of an underlying Grand Unified Theory. This leads to rather unusual supersymmetric spectra, with distinctive collider signatures and implications for cosmology.

Speaker: Dr Stéphane Lavignac (IPhT Saclay)

Slides Lavignac_SUSY10.pdf.pdf

16:29 Low-scale Gaugino-mediation in Warped Spacetime

We consider gaugino-mediated SUSY breaking in 5D warped spacetime, where matter is localized on the UV brane, main source of SUSY breaking is on the IR brane and gauge and Higgs superfields propagate in the bulk. We show that warped geometry in gaugino-mediation framework is required from the point of view of SUSY fine-tuning problem. Also, warped spacetime solves the stau LSP problem of gaugino mediation because gravitino becomes the LSP in this model. Finally, we add a small SUSY breaking term on the UV brane. This gives a correlation between tiny FCNC effects from gravity mediation contributions and gravitino mass.

Speaker: Mr Toshifumi Yamada (Sokendai, KEK)

Slides Low-scale_Gaugino_Mediation_in_Warped_Spacetime.pdf

16:46 Dirac Gauginos, Gauge Mediation and Unification

We investigate the building of models with Dirac gauginos and perturbative gauge coupling unification. Here, in contrast to the MSSM, additional fields are required for unification, and these can naturally play the role of the messengers of supersymmetry breaking. We discuss the constraints upon such models, present a framework within which such models can be constructed, and give some example models with spectra.

Speaker: Dr Mark Goodsell (DESY, Hamburg)

Slides goodsell-SUSY2010.pdf

17:03 Strongly Interacting Gauge Mediation at the LHC

Among models of supersymmetric extension of the Standard Model, low-energy gauge mediation models are very attractive, since they avoid the problem of flavor changing neutral current and are free from the notorious gravitino problem. Strongly interacting gauge mediation models are those with messengers, which are strongly coupled to a SUSY-breaking hidden sector. These models have a stable vacuum and are naturally compatible with a light gravitino. In this talk, I will discuss such models and their collider phenomenology.

Speaker: Mr Eita Nakamura (University of Tokyo)

Slides nakamura-pp.pdf

17:20 General Semi Direct Gauge Mediation

After an overview of known models of gauge mediation of supersymmetry breaking, I will describe one specific framework, known as semi-direct gauge mediation, which arises quite generically in string/D-brane models. Using a general gauge mediation formalism I discuss the generic phenomenological properties of this scenario, and the way to take advantage of its apparent problems, as well as possible interesting ways to evade them.

Speaker: Dr Alberto Mariotti (VUB)

Slides MariottiSUSY.pdf

17:37 Generalized Gaugino Condensation and Discrete R-Symmetries

One can define generalized models of gaugino condensation as theories which dynamically break a discrete R-symmetry, but do not break supersymmetry. We consider general examples consisting of gauge and matter fields, and the minimal number of gauge singlet fields to avoid flat directions in the potential. We explore which R-symmetries can arise, and their spontaneous breaking. In general, for a wide range of gauge groups, we find that the discrete symmetry is $\mathbb{Z}_{2b_0R}$ and the number of supersymmetric vacua is $b_0$, where $b_0$ is the coefficient of the one-loop beta function. We also comment on model building applications where a discrete R-symmetry, broken by the singlet vevs, can account for $\mu$-type terms and allow a realistic Higgs spectrum naturally, or be applied more broadly. This work is found in arXiv:1005.4686 (and has it's basis in the earlier work with Michael Dine in arXiv:0909.1615).

Speaker: John Kehayias (University of California, Santa Cruz)

Slides susy2010_kehayias.pdf

17:54 Stochastic supersymmetry

We propose a new realization of softly broken supersymmetric theories as theories defined on stochastic superspace. At the classical level, the supersymmetry breaking is parameterized in terms of a single (in general complex) mass parameter, $\xi$, describing the stochasticity of the Grassmannian superspace coordinates. In the context of the standard model with stochastic supersymmetry, the structure of the soft breaking terms has various characteristic features that can be tested in LHC experiments. We also discuss the phenomenology of extended models incorporating non-zero neutrino masses.

Speaker: Dr Kobakhidze Archil (The University of Melbourne)

Slides kobakhidze-BONN10.pdf

16:12 → 18:12 Phenomenology 23-2 Chair: B. Allanach

16:12 New particle mass spectrometry at the LHC

M_CT2 (Constransverse mass) variable has unique properties which can be utilized in the new particle mass measurement of SUSY-like events including multiple missing particles. We present the recent developments on using the M_CT2 for resolving new particle masses.

Speaker: Dr Won Sang Cho (University of Tokyo, IPMU)

Paper http://arxiv.org/abs/0912.2354 http://arxiv.org/abs/1008.0391

Slides mct2boost_susy10_wonsangcho.pdf

16:29 Determining the Structure of Supersymmetry-Breaking with Renormalization Group Invariants

If collider experiments demonstrate that the Minimal Supersymmetric Standard Model (MSSM) is a good description of nature at the weak scale, the experimental priority will be the precise determination of superpartner masses. These masses are governed by the weak scale values of the soft supersymmetry (SUSY)-breaking parameters, which are in turn highly dependent on the SUSY-breaking scheme present at high scales. It is therefore of great interest to find patterns in the soft parameters that can distinguish different high scale SUSY-breaking structures, identify the scale at which the breaking is communicated to the visible sector, and determine the soft breaking parameters at that scale. In this work, we demonstrate that 1-loop Renormalization Group (RG) invariant quantities present in the MSSM may be used to answer each of these questions. We apply our method first to generic flavor-blind models of SUSY-breaking, and then examine in detail the subset of these models described by General Gauge Mediation and the constrained MSSM with non-universal Higgs masses. As RG invariance generally does not hold beyond leading-log order, we investigate the magnitude and direction of the 2-loop corrections. We find that with superpartners at the TeV scale, these 2-loop effects are either negligible, or they are of the order of optimistic experimental uncertainties and have definite signs, which allows them to be easily accounted for in the overall uncertainty.

Speaker: Dr Nausheen Shah (Fermi National Accelerator Laboratory)

Slides RGI_SUSY10_Shah.pdf

16:46 The global electroweak fit and constraints on new physics with Gfitter

Supersymmetry and other physics beyond the Standard Model (SM) can modify the relations between electroweak observables and their theoretical predictions. Such effects can be parametrized in terms of effective, so-called oblique parameters. A global fit of the electroweak SM, as performed with the Gfitter package, allows one to determine the oblique parameters and to derive constraints on new physics. In this talk, the Gfitter results for the oblique parameters are presented coherently together with constraints on various new physics models, including Little Higgs models, Extra Dimensions, Technicolour and Four Generations. Emphasis is given to new Supersymmetry results.

Speaker: Mrs Dörthe Ludwig (Universität Hamburg)

Slides Ludwig_GlobalEWFit_BSM.pdf

17:03 SUSY-Yukawa Sum Rule at the LHC

We propose the "SUSY-Yukawa sum rule", a relationship between physical masses and mixing angles of the third-generation quarks and squarks. The sum rule follows directly from a relation between quark and squark couplings to the Higgs, enforced by SUSY. It is exactly this relation that ensures the cancellation of the one-loop quadratic divergence in the Higgs mass from the top sector. Testing the sum rule experimentally at a lepton collider would thus provide a powerful check on SUSY as the solution to the gauge hierarchy problem. At a hadron collider, we can use this sum rule as a tool to place strong bounds on the stop and sbottom mixing angles (within the SUSY framework) by measuring the lightest stop and sbottom masses. We outline how the required mass measurements could be performed, and estimate the accuracy that can be achieved at the LHC.

Speaker: Mr David Curtin (Cornell University)

Slides susy_sumrule_SUSY10presentation.pdf

17:20 Exploring the SUSY Landscape: A New Bayesian Approach

Supersymmetry (SUSY), with its multi-parameter space, has been a popular playground for many years. But now that the Large Hadron Collider (LHC) is operational, the goal is to determine whether this playground has anything to do with reality. In principle, the Bayesian approach provides a well-founded, coherent, way to perform such studies. However, such studies face a common problem: the construction of a suitable prior on the parameter space, from basic principles. Current studies place flat or logarithmic priors on the SUSY parameter spaces, but it is well-established that such priors can lead to pathological results in multi-parameter spaces. Here we propose a solution that starts with a reference prior and constructs the signal posterior density for a single count analysis. Since the signal is a function of the SUSY parameters, this posterior density induces some prior on that space. We argue that every SUSY model point, consistent with a given signal, that is, every "look-alike", be assigned the same prior density. We show that this is sufficient to construct a well-defined prior that permits the recursive inclusion of other measurements using standard Bayesian methods and therefore a prior than can be used for the systematic exploration of the SUSY landscape at the LHC.

Speaker: Sezen Sekmen (Florida State University)

Slides SekmenSUSY10.pdf SekmenSUSY10.pptx

17:37 Viability of MSSM scenarios at very large tan(beta)

We investigate the MSSM with very large tan(beta) > 50, where the fermion masses are strongly affected by loop-induced couplings to the "wrong" Higgs, imposing perturbative Yukawa couplings and constraints from flavour physics. Performing a low-energy scan of the MSSM with flavour-blind soft terms, we find that the branching ratio of B->tau nu and the anomalous magnetic moment of the muon are the strongest constraints at very large tan(beta) and identify the viable regions in parameter space. We also analyse the very large tan(beta) regime of General Gauge Mediation (GGM) with a low mediation scale. We point out that the possibility of a vanishing Bmu term at the mediation scale M, the "uplifted SUSY" scenario, is challenged by the experimental data on B->tau nu and the anomalous magnetic moment of the muon if M = 100 TeV.

Speaker: Mr David Straub (Technische Universität München)

Slides straub_susy10.pdf

17:54 Next-to-leading order SUSY pair productions at the LHC

SUSY pair productions at the LHC are studied at the next-to-leading corrections with the MadGraph/MadDipole+GOLEM framework. We present the NLO cross sections and discuss the perturbative behavior.

Speaker: Dr Kentarou Mawatari (ITP Heidelberg)

Slides mawatari_susy10.pdf

19:00 → 22:00 Reception

Tuesday, 24 August

09:00 → 09:30 Superconformal Symmetry and Inflation in NMSSM, A. Linde

Plenary talk
Chair: J.E. Kim

slides LindeSUSY.pdf

09:35 → 10:05 Asymmetric Dark Matter, S. Sarkar

Plenary talk
Chair: J. E. Kim

slides Sarkar_SUSY'10.pdf

10:10 → 10:40 Supersymmetric Dark Matter and SuperGUT Unification Models, K. Olive

Plenary talk
Chair: J.E. Kim

slides olivesusy10.pdf

10:45 → 11:15 Coffee break

11:15 → 11:45 Status of the LHC Operation, J. Wenniger

Plenary talk
Chair: G. Polesello

slides wenninger-LHC.SUSY10.v7.ppt

11:50 → 12:10 Recent Results from CMS, Chr. Sander

Plenary talk
Chair: G. Polesello

slides Sander-Susy10_CMS_v3.pdf

12:12 → 12:32 ATLAS Recent Results, A. Belloni

Plenary talk
Chair: G. Polesello

slides 100824_abelloni_FINAL.pdf

12:35 → 13:05 SUSY Mass Measurements at the LHC, K. Matchev

Plenary talk
Chair: G. Polesello

slides Matchev_SUSY2010_pdf.pdf

13:00 → 14:00 LUNCH

14:00 → 15:42 Collider 24-1 Chair: V. Büscher

14:00 Top, W and Z in ATLAS

Top quarks are expected to be produced copiously at the LHC, even at the lower beam energy and luminosity expected in the first year of running. Establishing the top-pair signal and measuring the production cross-section will be important benchmarks for ATLAS, which will also help understand the detector performance for events with high-pT leptons, high jet multiplicity, missing transverse energy and b-jets. With more data, the single top production process will also become observable, allowing detailed studies of electroweak top quark production and measurement of the CKM matrix element Vtb. The prospects for these early top physics measurements will be shown, with a particular emphasis on the progress achieved with data so far. The top quark is unique in the Standard Model by virtue of its large mass, possible role in electroweak symmetry breaking, and rapid decay without forming bound states. Precise measurements of its properties offer both sensitive tests of the Standard Model and possible pathways to discovering new physics, and are an important and challenging part of the ATLAS physics program. The prospects for measurements of the top quark mass, top quark decay properties such as polarization, spin correlations and anomalous couplings, and rare top decays signaling beyond-Standard Model physics, will be described The first measurement of the production cross-sections for W and Z bosons in proton proton interactions at sqrt(s) = 7 TeV are reported from the ATLAS experiment. Based on its excellent capability for reconstructing both high pT electrons and muons, the electron and the muon decay modes of the W/Z bosons are compared. First results for the ratio of W/Z production and of W+/W- production will also be described.

Speaker: Dr Sara Strandberg (LBNL)

Slides susy10.pdf

14:17 Measurement of high-pT jet distributions, properties of jets and inelastic pp events at ATLAS

Making use of the excellent calorimetry of the ATLAS experiment, measurements of the cross-section for jet production and of jet properties in proton-proton interactions at sqrt(s) = 7 TeV will be presented. The corrected and unfolded inclusive cross-section for high-pT jets will be described, together with the cross-section as a function of the invariant di-jet mass. Special emphasis will be given to the discussion of the initial understanding of the jet energy scale. Furthermore, the corrected distribution of the angular difference between the two leading jets will be shown, both for the azimuthal as well as for the polar angle. Also studies of the shape of the observed jets will be presented. All results will be compared to theoretical predictions. The dijet angular distributions in bins of dijet invariant mass are analyzed with the first $7$~TeV $pp$ collisions recorded with the ATLAS detector. The data are confronted with Standard Model predictions with the goal of searching for new phenomena: contact interactions and gravitationally mediated effects and extra dimension models The measurement of the properties of proton-proton interactions at center-of-mass energies ranging from 900 GeV (injection energy) to 7 TeV in the ATLAS detector are presented for a well defined kinematic region. Using charged particles (unfolded and corrected from observed tracks for detector effects), spectra in transverse momentum, pseudo-rapidity and particle density are studied both in an inclusive manner as well as for identified particles, such as Ks and Lambda. In addition, the momentum flow with respect to a high pT reference track is investigated to study the transition to the underlying event in high pT collisions. Using charged particles allows also to study the kinematic properties of jets built from tracks. The results are compared to Monte Carlo models and have been used to derive Monte Carlo tunes using the first ATLAS measurements from LHC to constrain model parameters.

Speaker: Dr Frederik Ruehr (Heidelberg KIP)

Slides 240810_fruehr_ATLAS.pdf

14:34 Seeking Supersymmetry at LHC7

We delineate the SUSY reach for the LHC operating at $\sqrt{s}$=7 TeV, for integrated luminosities ranging from 100~pb$^{-1}$ up to 1~fb$^{-1}$, that is anticipated to be accumulated before its energyupgrade to 14~TeV. Motivated by the quality of the early LHC measurements, we include missing transverse energy in our assessment of the reach, and show that for degenerate squarks and gluinos LHC7, with 1~fb$^{-1}$ of integrated luminosity, would be sensitive to sparticles as heavy as 1.1~TeV. If it turns out that missing transverse energy cannot be reliably determined, then the corresponding reach drops to just under 700 GeV (900 GeV) in the relatively background-free trilepton/same sign dilepton (acollinear di-jet) channels. We also discuss how uncertainties on the data-driven background determination will affect the LHC7 reach.

Speaker: Prof. Xerxes Tata (University of Hawaii)

Slides susy10.pdf

14:51 Searches for SUSY in inclusive All-Hadronic Events and Studies of MET

We discuss prospects for SUSY searches in the inclusive all-hadronic channel in the CMS experiment, and we present early results demonstrating the current performance of MET and other observables that play a critical role in these searches. These signatures are expected to be amongst the most sensitive to many SUSY models, but they are also very challenging. Emphasis is placed on methodologies for data-driven background determinations, tests based on early 7 TeV data, and early assessments of the tail of the MET and related distributions.

Speaker: Mr Christopher Rogan (CalTech)

Slides Rogan_SUSY10.pdf

15:08 Searches for SUSY in All-Hadronic Events with Exclusive Jets

We discuss prospects for SUSY searches in all-hadronic events in the CMS experiment with exclusive jet reconstruction. Due to their generic nature, these signatures are expected to be amongst the most sensitive to many SUSY models, but they are also very challenging. Several methods for data-driven background determinations are presented, along with results from tests on early 7 TeV data samples. These studies allow us to start to probe the behavior of the QCD background, and to study its kinematic properties with respect to several discriminating variables used in SUSY searches.

Speaker: Dr Christian Autermann (University of Hamburg)

Slides auterman_v3.pdf

15:25 Early searches for supersymmetry with jets and missing transverse energy with ATLAS

We report on early inclusive searches for new physics, in particular supersymmetry, in events with jets and missing transverse energy, with the ATLAS detector at the LHC. We focus on the relevant performance of the ATLAS detector in measuring jets and missing energy in first collision data, and we take a first look at the 7 TeV data set from a SUSY search perspective. We also report on the sensitivity of ATLAS for supersymmetry searches in this channel for the 2010-2011 LHC run.

Speaker: Dr Renaud Bruneliere (Uni Freiburg)

Slides renaud_bruneliere_atlas.pdf

14:00 → 15:42 Formal/Astro 24-1 Chair: N. Sakai

14:00 Holographic Currents and Chern-Simons Terms

Holographic currents and their associated Ward identities are derived in the framework of gravity/gauge duality. Holographic improvements of the energy-momentum tensor and R-symmetry current which are consistent with the Ward identities are displayed. The effects of specific string loop corrections to the bulk action are included as four derivative effective lagrangian terms and their contributions to the trace and R-symmetry anomalies of the boundary theory are determined. As an example, the construction is applied to the N=2 conformal supergravity which is taken to be dual to a boundary SU(N)xSU(N), N=1 superconformal field theory.

Speaker: Dr Tonnis ter Veldhuis (Macalester College)

Slides SUSY10.pdf

14:17 Classification of BPS Objects in N=6 Chern-Simons Matter Theory

We investigate BPS conditions preserving n/12 (n=1, .. , 6) supersymmetries in the Aharony-Bergman-Jafferis-Maldacena (ABJM) model. The BPS equations are classified in terms of the number of preserved supercharges and remaining subgroups of the SU(4)_R symmetry. We study the structures of a map between projection conditions for the supercharges in eleven dimensions and those in the ABJM model. The BPS configurations in the ABJM model can be interpreted as known BPS objects in eleven-dimensional M-theory, such as intersecting M2, M5-branes, M-waves, KK-monopoles and M9-branes. We also show that these BPS conditions reduce to the BPS conditions in N=8 super Yang-Mills theory via the standard D2-reduction procedure in a consistent way with the M-theory interpretation of the BPS conditions.

Speaker: Dr Shin Sasaki (Tokyo Institute of Technology)

Slides susy2010_SASAKI.pdf

14:34 DBI and Universal Hypermultiplet in N=2 Supersymmetry

The effective action of string compactifications on Calabi-Yau manifolds can be described in 4d global N=2 supersymmetry in the gravity-decoupling limit. Adding D-branes brakes half of the supersymmetry, which is then nonlinearly realised on their worldvolume. I will describe the coupling of the DBI action for the D-brane gauge field to the Universal Hypermultiplet. Taking into account the Heisenberg symmetry of string perturbation theory uniquely fixes the form of the action, thus providing a consistent effective theory description of (the brane-dilaton sector of) string compactifications. The analysis of this system shows some interesting dynamics.

Speaker: Dr Nicola Ambrosetti (University of Bern)

Slides Ambrosetti.pdf

14:51 Non-supersymmetric Extremal RN-AdS Black Holes in N=2 Gauged Supergravity

We investigate extremal Reissner-Nordstrom-AdS black holes in four-dimensional N=2 abelian gauged supergravity. We find a new attractor equation which is not reduced to the one in the asymptotically flat spacetime. Focusing on so-called the T^3-model with a single neutral vector multiplet, we obtain non-supersymmetric extremal Reissner-Nordstrom-AdS black hole solutions with regular event horizon in the D0-D4 and the D2-D6 charge configurations. The negative cosmological constant emerges even without the Fayet-Iliopoulos parameters. Furthermore, we also argue the formal description of the non-supersymmetric black hole solutions of the T^3-model and the STU-model in generic configurations.

Speaker: Dr Tetsuji Kimura (KEK)

Slides Kimura_100824.pdf

15:08 Inflaton versus Curvaton in Higher Dimensional Gauge Theories

We construct a model of cosmological inflation and perturbation based on the higher-dimensional gauge theory. The inflaton and curvaton are the scalar fields arising from the extra space components of the gauge field living in more than four dimensions. We take the six-dimensional (6D) Yang-Mills theory compactified on $T^2$ as a toy model. The one-loop effective potential of the inflaton and the curvaton can reproduce the observed values of the spectral index and the curvature perturbation.

Speaker: Yoji Koyama (Department of Physics, Chuo University)

Slides SUSY10_talk_file,_Yoji_Koyama.pdf

15:25 Racetrack inflation and F-term uplifting

It is shown that two classes of racetrack inflation models, saddle point and inflection point ones, can be constructed in a fully supersymmetric framework with the matter field F-term as a source of supersymmetry breaking and uplifting. Two models of F-term supersymmetry breaking are considered: the Polonyi model and the quantum corrected O'Raifeartaigh model. In the former case, both classes of racetrack inflation models differ significantly from the corresponding models with non-supersymmetric uplifting. The main difference is a quite strong dominance of the inflaton by the matter field. In addition, fine-tuning of the parameters is relaxed as compared to the original racetrack models. In the case of the racetrack inflation models coupled to the O'Raifeartaigh model, the matter field is approximately decoupled from the inflationary dynamics.

Speaker: Marcin Badziak (University of Warsaw)

Slides Badziak_susy10.pdf

14:00 → 15:42 Model Building 24-1 Chair: S. Abel

14:00 Nonlinear Supersymmetry(NLSUSY) and General Relativity(GR)

NLSUSY GR theory has been constructed by the geometrical arguments on new space-time just inspired by NLSUSY. NLSUSY GR equipped with space-time origin spontaneous SUSY breaking produces the fundamental action(SGM action) in ordinary Riemann space-time, i.e. the Einstein Gravity, Nambu-Goldstone fermions and the cosmological term. The vacuum of SGM action is realised when NG frmions constitute the supermultiplet of the familiar LSUSY theory as SUSY-composites. Physical significances characterictic of SGM scenario are presented, which gives new insights into the origin of mass, dark energy, Yukawa-gauge coupling constants,etc. NLSUSY GR predicts the 4 dimensional space-time.

Speaker: Prof. Kazunari Shima (Saitama Institute of Technology)

Slides shima-SUSY2010.pdf

14:17 Aspects of Non-minimal Gauge Mediation

A large class of non-minimal gauge mediation models, such as (semi-)direct gauge mediation, predict a hierarchy between the masses of the supersymmetric standard model gauginos and those of scalar particles. In addition, the GUT relation of the gaugino masses is broken unlike the case of minimal gauge mediation. I discuss the LHC signals and cosmology of such models.

Speaker: Mr Satoshi Shirai (University of Tokyo)

Slides SUSY_shirai.pdf

14:34 Gauged supersymmetric U(1)_B × U(1)_L model

We consider an extension of the minimal supersymmetric standard model (MSSM) with extra U(1)_B × U(1)_L gauge symmetry that are broken spontaneously. Salient features of this model are that there are two different types of cold dark matter candidates, and neutral scalar sector has a rich structure. One can accommodate the neutrino masses and mixings. There could be interesting signatures of new fermions and new gauge bosons at the LHC.

Speaker: Dr Yuji Omura (KIAS)

Slides Yuji_Omura(KIAS)(Model_building_24-1-1434).pdf

14:51 Metastability bounds on flavor-violating trilinear soft terms in the MSSM

Vacuum stability bounds on flavor-violating trilinear soft terms are revisited from the viewpoint that one should not rule out parameter space that leads to a metastable standard vacuum if it is sufficiently long-lived. Bounds are obtained by numerical computation of false vacuum decay rate. Implications are discussed on future searches for FCNC processes.

Speaker: Dr Jae-hyeon Park (DESY)

Slides jhpark-susy10.pdf

15:08 SUSY breaking and soft terms in models with anomalous U(1) and non-perturbative Polonyi term

We study SUSY breaking and its transmission to the supersymmetric Standard Model in models with anomalous U(1) gauge symmetry where non-perturbative Polonyi term stabilizes the Green-Schwarz modulus. The pattern of SUSY breaking crucially relies on the ratio R between the Fayet-Iliopoulos term and the mass contribution of the Green-Schwarz modulus to the anomalous gauge boson. In the presence of anomalous U(1), soft SUSY-breaking terms are generated by modulus, anomaly and gauge mediations, whose relative importance is determined by the size of R. Furthermore, the anomalous D-term generically gives important contributions to soft scalar masses. The effects of anomalous U(1) on SUSY breaking can be understood more clearly within the low energy effective theory constructed by integrating out the anomalous vector superfield.

Speaker: Dr Kwang Sik Jeong (Tohoku University)

Slides SUS10_KSJ.pdf

15:25 Renormalization effects on MSSM from a calculable model of strongly coupled hidden sector

We investigate renormalization effects on the low energy mass spectrum of the minimal supersymmetric standard model (MSSM), using a calculable model of spontaneous supersymmetry breaking in the hidden sector. We model the hidden sector by N=2 supersymmetric quantum chromodynamics with gauge group SU(2)xU(1) and N_f=2 matter hypermultiplets, perturbed by a Fayet-Iliopoulos term which breaks the supersymmetry down to N=0 on meta-stable vacua in a controllable manner. The hidden sector Kahler metric is renormalized, contributing to the MSSM renormalization group flows via gauge mediation. It is found that the MSSM soft scalar masses can be made larger or smaller due to the hidden sector renormalisation effects, depending on how the hidden sector fields are coupled to the messenger fields. This model provides a concrete example in which strongly coupled hidden sector dynamics is related to the low energy spectrum of MSSM particles that are expected to be accessible in collider experiments.

Speaker: Dr Masato Arai (Czech Techinical University in Prague)

Slides arai-SUSY.pptx

14:00 → 15:42 Phenomology 24-1 Chair: A. Romanino

14:00 Measurement of BR(K --> e nu)/BR(K --> mu nu) The NA62 Collaboration

Measurement of the helicity suppressed ratio of charged kaon leptonic decay rates BR(K --> e nu)/BR(K --> mu nu) has long been considered as an excellent test of lepton universality and of the Standard Model (SM) description of weak interactions. It was pointed recently that the suppression of the SM contribution might enhance the sensitivity to SUSY-induced effects to an experimentally accessible level. The NA62 experiment at the CERN SPS has collected a record number of over 105 K --> e nu decays during a dedicated run in 2007, aiming at achieving 0.5% precision. Experimental strategy, details of the analysis and preliminary results are discussed.

Speaker: Riccardo Fantecchi (CERN)

Slides Fantechi_susy10.ppt

14:17 Lepton flavour observables in the MSSM

In view of the new NA62 measurement of R_K = Gamma(K -> e nu)/Gamma(K -> mu nu) probing lepton flavour universality with an unprecedented precision, I critically discuss supersymmetric contributions to this observable. The MSSM corrections to R_K are constrained using the anomalous magnetic moment of the electron a_e and the renormalisation of its mass m_e. Neither of these quantities has been studied before to place constraints on the MSSM parameter space. I include the effects of stau mixing and discuss the impact of a future determination of the lightest stau mass on R_K. Further, I present chirally enhanced non-decoupling radiative corrections to light lepton masses. By applying 't Hooft's naturalness criterion I derive new bounds on the trilinear A-terms. Finally I show how the combined information of the muon anomalous magnetic moment and of future collider data on the smuon mass can be used to disentangle the tree-level and radiatively induced contributions to the muon Yukawa coupling.

Speaker: Mrs Jennifer Girrbach (Karlsruhe Institute of Technology, Institut fuer Theoretische Teilchenphysik)

Slides girrbach.pdf

14:34 New result from the MEG experiment

MEG, Mu-E-Gamma, is an experiment aiming to detector a lepton-flavor violating muon decay, mu-->e gamma, with a better sensitivity than that of the previous experiment. The ultimate goal of the MEG experiment is to reach the sensitivity of the Br(mu->e gamma) at 10^13. Recently we have published our first result obtained using 2008 data, setting the branching ratio limit of 2.8x10^-11 at 90% C.L. We present an updated result using 2009 data in this presentation.

Speaker: Dr Satoshi Mihara (KEK)

Slides susy10-mihara.ppt

14:51 Interplay of LFV and slepton mass splittings at the LHC as a probe of the SUSY seesaw

We study the impact of a type-I SUSY seesaw concerning flavour violation (LFV) both at low energies and at the LHC. The study of the dilepton invariant mass distribution at the LHC allows to reconstruct some of the masses of the different sparticles involved in a decay chain (with an expected precision around the percent level). If slepton mass splittings are interpreted as due to the violation of lepton flavour, one expects further low-energy manifestations of LFV, such as radiative and three-body lepton decays. Under the assumption of a type-I seesaw as the source of neutrino masses and mixings, all these LFV observables will be related. Working in the framework of the cMSSM extended by three right-handed neutrino superfields, we conduct a systematic analysis adressing the simultaneous implications of the SUSY seesaw for both high- and low-energy lepton flavour violation. We discuss how the confrontation of slepton mass splittings as observed at the LHC and low-energy LFV observables may provide important information about the underlying mechanism of LFV.

Speaker: Ana M. Teixeira (LPC Clermont)

Slides teixeira.SUSY2010.pdf

15:08 Ultrarelativistic sneutrinos at the LHC and sneutrino-antisneutrino oscillation

Sneutrino-antisneutrino oscillation can be a very useful probe to look for signatures of lepton number violation ($\Delta L$ = 2) at the LHC. Here, we discuss the effect of the boost factor $\gamma$ and the travelling distance $L$ on the probability of the oscillation. We demonstrate that these two parameters can significantly alter the probability of the oscillation when the sneutrinos are ultrarelativistic and have a very small total decay width. We propose a scenario where these requirements are fulfilled and which produces interesting signals at the LHC even for a mass splitting $\Delta m$ as small as $10^{-14}$ GeV between the sneutrino mass eigenstates.

Speaker: Mr Tuomas Honkavaara (Helsinki Institute of Physics)

Slides honkavaara_t_id_115.pdf

15:25 Flavor changing neutral currents in two Higgs doublet models

After a brief introduction of the two Higgs doublet models, we compare the effectiveness of the two hypotheses of Natural Flavor Conservation and Minimal Flavor Violation, in suppressing the strength of flavor changing neutral currents. The phenomenological implications of the Minimal flavor violating scenario are discussed. Particular focus is given to the CP-violating asymmetry of the Bs meson mixing system: we will show that, introducing flavor blind CP phases, the model can accommodate a large asymmetry, as recently hinted by CDF and D0 data.

Speaker: Stefania Gori (Technical University Munich)

Slides TalkGori.pdf

15:42 → 16:12 Coffee break

16:12 → 18:12 Astro 24-2 Chair: L. Covi

16:12 Gauge Non-Singlet Inflation in SUSY GUTs

We explore the novel possibility that the inflaton responsible for cosmological inflation is a gauge non-singlet in supersymmetric Grand Unified Theories. For definiteness we consider SUSY hybrid inflation where we show that the scalar components of gauge non-singlet superfields, together with fields in conjugate representations, may form a D-flat direction suitable for inflation. We apply these ideas to SUSY models with an Abelian gauge group, a Pati-Salam gauge group and finally Grand Unified Theories based on SO(10) where the scalar components of the matter superfields in the 16s may combine with a single $\bar 16$ to form the inflaton, with the right-handed sneutrino direction providing a possible viable trajectory for inflation. Assuming sneutrino inflation, we calculate the one-loop Coleman-Weinberg corrections and the two-loop corrections from gauge interactions giving rise to the ''gauge eta-problem'' and show that both corrections do not spoil inflation, and that the monopole problem can be resolved.

Speaker: Mr Jochen P. Baumann (Max-Planck-Institut für Physik (Werner-Heisenberg-Institut))

Slides JBaumannSUSY.pdf

16:29 MSSM Higgses and their cosmological consequences

I will discuss the role of MSSM Higgses in the early universe cosmology. The Higgses below the hidden sector SUSY breaking scale create a mini-landscape of potential spanned by the parameter space of soft SUSY breaking terms and the non-renormalizable operators, which can support primordial inflation at high scales and electroweak symmetry breaking at low scales. The Higgses also seed primordial density fluctuations which are responsible for creating the temperature anisotropy in the cosmic microwave background radiation. The decay of the Higgses excites all the matter we see Today including baryons and dark matter.

Speaker: Dr Mazumdar Anupam (Lancaster University)

16:46 Higgs inflation in supergravity

We consider the supersymmetric version of the Higgs inflation scenario with non-minimal coupling in 4D Jordan frame supergravity. We find that there occurs a tachyonic instability along the direction of the accompanying non-inflaton field in generic Jordan frame supergravity models. We find that a higher order correction to the Jordan frame function solves the tachyonic mass problem and show that the necessary correction can be naturally generated by the heavy thresholds without spoiling the slow-roll conditions. We discuss the implication of the Higgs inflation on NMSSM.

Speaker: Dr Hyun Min Lee (CERN)

Slides susy10_hmlee.pdf

17:03 Cosmic Ray Anomalies in the MSSM?

We present a summary of recent results obtained from a scan of the 19-dimensional parameter space of the pMSSM and its implications for indirect dark matter searches. In particular, it is well-known that the MSSM cannot accomodate the recent anomalies observed by PAMELA and Fermi without the incorporation of a rather large boost factor of order 1000. We combine a scan over the astrophysical parameters that compute the standard cosmic ray background flux (via GALPROP) with our scan in the pMSSM, and find that we are able to fit the data with sizeable excesses over background in the positron spectrum and no corresponding excess in the anti-proton spectrum with a much lower boost factor.

Speaker: Prof. JoAnne Hewett (SLAC, Stanford University)

Slides SUSY10.pdf

17:20 Entropy production and curvature perturbation from dissipative curvatons

Considering the curvaton field that follows dissipative slow-roll equation, we show that the field can lead to entropy production and generation of curvature perturbation after reheating.

Speaker: Mr Tomohiro Matsuda (Saitama Institute of Technology)

Slides tmatsuda.pdf

17:37 Mixed axion/axino cold dark matter in SUSY models

Supersymmetric models of particle physics with neutralino dark matter tend to predict too much dark matter (the case of binos) or too little dark matter (case of winos or higgsinos). If instead we solve the strong CP problem via PQ symmetry breaking, we expect dark mater to be composed of an axion/axino mixture. If the PQ breaking scale is high, then the re-heat temperature can be driven high enough to allow for leptogenesis, while solving the gravitino problem. The model works best if there is a large component of axion DM. In this case, we expect no direct/indirect WIMP signals, but possibly an axion signal, and quite different signatures for SUSY at LHC from conventional scenarios with neutralino DM.

Speaker: Prof. Howard Baer Baer (University of Oklahoma)

Slides susy2010_baer.pdf.pdf

17:54 Non-Gaussianities in string inflation

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Speaker: Dr Ivonne Zavala (University Bonn)

Slides ZavalaSUSY.pdf

16:12 → 18:12 Collider 24-2 Chair: W. Beenakker

16:12 Gluino Pair Production at the LHC

We present new results for gluino pair production at the LHC. We concentrate on production around threshold using an approach based on non-relativistic QCD. In particular, we discuss two different cases, the squarks being heavier than the gluino, here bound states of two gluinos can be formed and possibly observed, and a more general case covering open gluino production for arbitrary ratios of the masses of gluinos and squarks.

Speaker: Dr Peter Marquard (KIT)

Slides SUSY_marquard.pdf

16:29 Early Searches for supersymmetry with isolated leptons, jets and missng transverse energy at sqrt(s) = 7TeV with the ATLAS experiment

We show first results of early inclusive searches for new physics, in particular supersymmetry, in events with multiple isolated high momentum leptons, and possibly jets and missing transverse energy, with the ATLAS detector at the LHC, in the initial 7 TeV data set.

Speaker: Dr Yousuke Kataoka (Tokyo ICEPP)

Slides susy10_kataoka.pdf

16:46 Search for new Physics in the dijet mass spectrum and dijet ratio in pp Collisions at sqrt(s) = 7 TeV

We report on a search for new physics in dijet production at CMS, using the first pp collision data at sqrt{s}=7 TeV provided by CERN's Large Hadron Collider. The measured dijet mass spectrum is compared with QCD predictions. We use the dijet mass spectrum to search for dijet resonances that could come from several models, such as, axigluons, flavor univerals colorons, excited quarks or E6 diquarks.We have also measured the production ratio for events with two leading jets in two regions of pseudorapidity. The dijet centrality ratio, N(|η| < 0.7)/N(0.7 < |η| < 1.3), is sensitive to dijet angular distributions. The dijet centrality ratio is measured in bins of dijet mass, compared with the predictions of QCD, and used to search for the following new physics models: quark contact interactions and excited quarks.

Speaker: Dr James Francis Hirschauer (FNAL)

Slides hirschauer_dijets_susy10.pdf

17:03 Reconstructing particle masses from pairs of decay chains

A method is proposed for determining the masses of the new particles in collider events containing a pair of effectively identical decay chains. By first determining the upper edge of the dilepton invariant mass spectrum, we reduce the problem to a curve for each event in the 3-dimensional space of mass-squared differences. A statistical approach is applied to take account of mismeasurement of jet and missing momenta. The method is easily visualized and rather robust against combinatorial ambiguities and finite detector resolution. It can be successful even for small event samples, since it makes full use of the kinematical information from every event.

Speaker: Dr Kazuki Sakurai (Cambridge University)

Slides sakurai_SUSY10.pdf

17:20 First ATLAS searches for supersymmetry with b-tagged jets and missing transverse energy at sqrt(s) = 7 TeV

A broad range of models for new physics predict enhanced couplings to third generation quarks. We report on early searches for new physics, in particular supersymmetry, with the ATLAS detector at the LHC, focusing on events with b-tagged jets and missing transverse energy. We discuss the relevant performance of the ATLAS detector in tagging bottom quark jets in first collision data, and we present a first look at the 7 TeV data set from a SUSY search perspective.

Speaker: Dr Mark Hodgkinson (University of Sheffield)

Slides markhodgkinson_susy2010.pdf

17:37 Searches for Supersymmetry in final states with leptons

We present methods for background determinations in SUSY searches with signatures involving like-sign di-leptons or tri-leptons. These signatures have very low expected backgrounds in the Standard Model and have the characteristics of a rare search in which one searches for a small signal over a very small background. We present early results from studies of methods for data-driven background determinations in 7 TeV data.

Speaker: Mr Yuriy Pakhotin (Univ. of Florida)

Slides Pakhotin_SUSY-2010-08-24_SUSY10_v3.ppt

17:54 Discrimination between NMSSM and MSSM at LHC

Next to minimal Supersymmetric standard model is a solution to the mu problem in minimal supersymmetric standard model. We discuss how one can distinguish these two models at Large Hadron Collider. We find that signals from the third lightest neutralino are important.

Speaker: Mr Shohei Sugiyama (Nagoya University)

Slides sugiyama.pdf

16:12 → 18:11 Model Building 24-2 Chair: U. Nierste

16:12 The Aligned two-Higgs-doublet model

The alignment in flavour space of the Yukawa matrices of a general two-Higgs-doublet model (THDM) results in the absence of tree-level flavour-changing neutral currents. In addition to the usual masses and mixings, the aligned Yukawa structure is parametrized by three complex numbers which are potential new sources of CP violation. For particular values of these complex parameters all Z2-type models are recovered. One of the most distinctive features of the THDM's is the presence of a charged Higgs, whose phenomenology is also showed in this talk finding important bounds on the Aligned two-Higgs-doublet model (ATHDM) parameter space.

Speaker: Ms Paula Tuzon (Departament de Física Teòrica - IFIC, Universitat de València)

Slides tuzon.pdf

16:29 Supersymmetric Yukawaon Model

In the yukawaon model, effective Yukawa coupling constants $Y_f^{eff}$ are given by vacuum expectation values (VEVs) of gauge singlet scalars $Y_f$ ("yukawaons"): $(Y_f^{eff})_{ij} =(y_f/\Lambda) \langle (Y_f)_{ij} \rangle$ ($i,j=1,2,3$), where $\Lambda$ is a scale of an effective theory. Differently from a Froggatt-Nielsen type model, we introduce each yukawaon $Y_f$ for each fermion sector $f$ ($f=u,d, \dots$). A unified description of quark and lepton mass matrices is realized by introducing a further fundamental scalar field $\Phi_e$ and by considering that each VEV structure $\langle Y_f \rangle$ is given by a bilinear form of the VEV matrix $\langle \Phi_e \rangle$. Such VEV matrix relations are obtained from supersymmetric vacuum conditions for a superpotential which is invariant under flavor symmetries concerned. As a result, the observed tribimaximal neutrino mixing, CKM quark mixing, and quark mass ratios are explained with quite few parameters, without assuming any discrete symmetry for the neutrino sector. References: Y.Koide, Phys.Lett. B680, 76 (2009); Y.Koide, Phys.Lett. B687, 219 (2010).

Speaker: Prof. Yoshio Koide (Osaka University)

Slides Koide_SUSY2010.pdf

16:46 Lepton flavor violation in SUSY left-right symmetric theories

The seesaw mechanism is the most popular explanation for the smallness of neutrino masses. However, its high scale makes impossible to test it directly and only indirect signals at low energies are reachable for collider experiments. One of these indirect links with the high scale is LFV, known to be correlated with neutrino oscillation parameters in some scenarios. In this talk I will discuss lepton flavor violating decays of sleptons in the context of a SUSY left-right symmetric model that naturally incorporates the seesaw mechanism. In addition to the link between LFV and neutrino mixing angles, this non-minimal embedding of the seesaw leads to observable LFV effects in the right-handed sleptons sector, contrary to minimal models where these are found to be totally negligible. Therefore, LFV observables can be used as a powerful tool to study physics right below the GUT scale.

Speaker: Mr Avelino Vicente (IFIC - CSIC/U. Valencia)

Slides A_Vicente.pdf

17:03 From Flavour to SUSY Flavour Models

We consider SUSY GUT models of flavour capable of explaining the flavour structure of quarks and leptons, via the spontaneous breaking of a non-Abelian family symmetry. We focus on the consequences of such models for the SUSY-flavour structure, i.e. for the soft SUSY breaking terms. We highlight generic features of models with real triplet representations and discuss a new class of models based on $SO(3)$ or $A_4$ family symmetry, broken by the vacuum expectation values of four “flavon” fields pointing in postulated specific directions in flavour space. The class of models allows for an excellent fit to the present quark and charged lepton data and leads to interesting predictions for the neutrino sector as well as for the SUSY-flavour structure.

Speaker: Mr Vinzenz Maurer (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut))

Slides Vinzenz_Maurer_SUSY10.pdf

17:20 New GUT Predictions for Quark and Lepton Yukawa Coupling Ratios

Group theoretical factors from GUT symmetry breaking can lead to predictions for the ratios of quark and lepton Yukawa couplings at the unification scale. Due to SUSY threshold corrections the viability of such predictions can depend strongly on the SUSY parameters. For three common minimal SUSY breaking scenarios we investigate which GUT scale ratios y_e/y_d, y_\mu/y_s, y_\tau/y_b and y_t/y_b are allowed when phenomenological constraints are taken into account. We derive possible new predictions for the GUT scale mass ratios and compare them with the phenomenologically allowed ranges. We find that new GUT scale predictions such as y_\mu/y_s = 9/2 or 6 and y_\tau/y_b = 3/2 or 2 are often favoured compared to the ubiquitous relations y_\mu/y_s = 3 or y_\tau/y_b =1. We will also give a concrete implementation of these new relations.

Speaker: Mr Martin Spinrath (MPI for Physics)

Slides SUSY_Spinrath.pdf

17:37 Models of Lepton Flavor from Small Groups

Using the particle content of the Altarelli-Feruglio model as a paradigm, we generalize the family symmetry A4 x Z3 to all 1048 groups of order less than or equal to 100 and derive the Lagrangian for the lepton sector, the mixing matrices, and finally the mixing angles. We compare our findings to experimental data and identify the cases (i) where tribimaximal mixing occurs, (ii) where the mixing angles are in agreement with the experimental constraints. We explain the calculational tools that we have used and that we believe to be useful for model building. In particular, we work out one example in detail to illustrate our general approach.

Speaker: Dr Akin Wingerter (Indian Institute of Science)

Slides wingerter_talk.pdf

16:12 → 18:12 Phenomology 24-2 Chair: S. Baek

16:12 Measurements of the CKM Elements at BABAR

A variety of recent measurements determining sides of the CKM unitarity triangle have been performed with Babar data and will be reported. These include: a measurement of |Vcb| and the form-factor slope in B -> D l nu Decays in events tagged by a fully reconstructed B meson; measurement and interpretation of moments in inclusive decays B->Xc l nu; measurement of |Vub| from form-factor shapes and branching fractions of exclusive semileptonic decays; and measurements of partial branching fractions for $\B \to X_u \ell \bar{\nu}$ in a determination of |Vub|. We also report on the determination of |Vus| using tau lepton decays to pi nu and K nu.

Speaker: Mr Martin Nagel (University of Colorado)

Slides MartinNagel_CKMatBabar.pdf

16:29 First Row CKM Unitarity Tests and the MSSM

Low energy precision tests provide a probe on new physics which can complement the LHC. One such test is of first row CKM unitarity, which we are using to place limits on MSSM parameters. We scanned over the parameter space of the MSSM, and computed corrections to the Fermi constant for beta decay as a function of MSSM parameters. These corrections lead to apparent violations of first row CKM unitarity. Due to current conservation, strong dynamics do not overwhelm these corrections. Experimental precision is at the part per thousand level. Theoretical hadronic and nuclear physics uncertainties also have been reduced to this level. There is intense activity, particularly with ongoing developments in neutron decay. It is interesting to ask at what level of precision these experiments probe SUSY. Our study sets the benchmark of precision for the needed sensitivity.

Speaker: Dr Sky Bauman (University of Wisconsin-Madison)

Slides sbauman-talk13.pdf

16:46 Measurement of B->tau nu

We present a search for the fully leptonic B decay B+ -> tau+ nutau in 4.59x 10^8 B Bbar pairs collected at the Upsilon(4S) resonance using the BaBar detector. We select a sample of events with a reconstructed hadronic B decay, B- -> D^{0} X^{-}$, where $X$ represents a combination of charged and neutral light mesons; in the remainder of each event we search for the B+ -> tau+ nutau signal.

Speaker: Dr Andrew Ruland (The University of Texas at Austin)

Slides aruland_susy2010_session24-2.pdf

17:03 Radiative Penguin B decays at BABAR

We report on recent results from BABAR on radiative penguin decays of B mesons including a study of B → Xd γ decays and determination of |Vtd/Vts| and a measurement of B → Xs γ branching fraction and CP asymmetry.

Speaker: Mr David Doll (CalTech)

Slides Doll_SUSY10.pdf Doll_SUSY10.ppt

17:20 Searches for New Physics at BaBar

We report on recent results from BABAR on searches for new physics including: search for invisible decays of the Upsilon(1S); search for baryon and lepton number violation in B decays; searches for lepton flavour violation and tests of universality in the decays of the tau and narrow Upsilon states; and a search for a Light Scalar in Radiative Transitions $\Upsilon\to\gamma A^0$.

Speaker: Prof. Milind Purohit (Univ. of South Carolina)

Slides PurohitSUSY10.pdf

17:37 Strongly Coupled Semi-Direct Mediation of Supersymmetry Breaking

We study gaugino mass generation in the context of semi-direct gauge mediation models, where the messengers are charged under both the hidden sector and the standard model gauge groups while they do not play important roles in dynamical supersymmetry breaking. We clarify the cancellation of the leading contributions of the supersymmetry breaking effects to the gaugino mass in this class of models in terms of the macroscopic effective theory of the hidden sector dynamics. We also consider how to retrofit the model so that we obtain the non-vanishing leading contribution to the gaugino mass.

Speaker: Mr Yuichiro Nakai (Yukawa Institute for Theoretical Physics)

Slides nakai-SUSY10.pdf

17:54 Flavour Models at 7 TeV SUSY

The ongoing LHC experiment shall be able to probe gluino and squark masses up to values of about 1 TeV. Assuming that hints for such a superpartner are found, we explore the constraints on the CMSSM parameter space provided by flavour and CPV observables. We also characterize the predictions of U(1) and SU(3) flavour models in such a scenario, and indicate which processes are best suited to distinguish them.

Speaker: Mr Joel Jones-Perez (Universitat de Valencia)

Slides j.jonesperez.susy2010.pdf

Wednesday, 25 August

09:00 → 09:30 Recent Results on Searches from CMS, M. Pierini

Plenary talk
Chair: W. de Boer

slides pierini-SUSY10.pdf

09:35 → 10:05 Higgs, SUSY & non-SUSY BSM in ATLAS, J. Haller

Plenary talk
Chair: W. de Boer

slides SUSY2010plenaryHallerfinal.ppt

10:10 → 10:40 New Search Techniques using Jet Structure, J. Butterworth

Plenary talk
Chair: W. de Boer

slides susy10-jmb.pptx

10:45 → 11:15 Coffee break

11:15 → 11:45 B Physics - Status and Prospects, U. Uwer

Plenary talk
Chair: J. Hewett

slides uwer-Talk-SUSY.pdf

11:50 → 12:20 Supersymmetric Flavour Physics, U. Nierste

Plenary talk
Chair: J. Hewett

slides nierste_susy10.pdf

12:25 → 12:55 The SUSY Flavor Code, A. Dedes

Plenary talk
Chair: J. Hewett

slides dedes-Talk_SUSY_FLAVOR-SUSY-10.pdf

13:15 → 18:15 Excursions

Thursday, 26 August

09:00 → 09:30 Dark matter, supersymmetry, and the early discovery potential at the LHC, P. Nath

Plenary talk
Chair: N. Sakai

slides Pran_Nath_Bonn_SUSY_2010.pdf

09:35 → 10:05 The Next-to-Minimal Supersymmetric Standard Model at the LHC, U. Ellwanger

Plenary talk
Chair: N. Sakai

slides ellwanger_susy2010.new.pdf

10:10 → 10:40 News on Axino and Gravitino DM, L. Covi

Plenary talk
Chair: N. Sakai

slides SUSY-10-covi.pdf

10:45 → 11:15 Coffee break

11:15 → 11:45 Direct Matter Searches: an Overview, L. Baudis

Plenary talk
Chair: X. Tata

slides baudis_susy10.pdf

11:50 → 12:20 New Models of Dark Matter, K. Zurek

Plenary talk
Chair: X. Tata

slides zurek-10_SUSY.pdf

12:25 → 12:55 Neutrino Physics from Precision Cosmology, S. Hannestad

Plenary talk
Chair: X. Tata

slides susy2010.ppt

13:00 → 14:00 LUNCH

14:00 → 15:42 Astro 26-1 Chair: Y. Wong

14:00 The degenerate gravitino scenario

In this work, we explore the "degenerate gravitino" scenario where the mass difference between the gravitino and the lightest MSSM particle is much smaller than the gravitino mass itself. In this case, the energy released in the decay of the next to lightest sypersymmetric particle (NLSP) is reduced. Consequently the cosmological and astrophysical constraints on the gravitino abundance, and hence on the reheating temperature, become softer than in the usual case. On the other hand, such small mass splittings generically imply a much longer lifetime for the NLSP. We find that, in the constrained MSSM (CMSSM), for neutralino LSP or NLSP, reheating temperatures compatible with thermal leptogenesis are reached for small splittings of order 10^{-2} GeV. While for stau NLSP, temperatures of 4x10^9 GeV can be obtained even for splittings of order of tens of GeVs. This "degenerate gravitino" scenario offers a possible way out to the gravitino problem for thermal leptogenesis in supersymmetric theories.

Speaker: Dr Oscar Vives (U. de Valencia and IFIC)

Slides vivesgravitino.pdf

14:17 Gravitino dark matter and a high reheating temperature

Supersymmetry breaking mediated by gauge interactions is regarded an attractive option due to the lack of new sources of flavor changing neutral currents other than those already present in the Standard Model. In models with gauge mediated supersymmetry breaking (GMSB), the dark matter particle is the gravitino. It is produced both thermally in scatterings in the hot plasma and non-thermally from decays of the next to lightest supersymmetric particle (NLSP). If the NLSP is sufficiently abundant during Big Bang Nucleosynthesis (BBN), these decays can alter the abundances of light elements. This, in turn, gives constraints on the gravitino mass and, for the observed dark matter abundance, on the reheating temperature of the Universe. Since sufficiently high reheating temperature is crucial for thermal leptogenesis, one obtains constraints on viable models with GMSB. We study the interplay of these constraints for a neutralino NLSP with a GeV-scale gravitino in the phenomenological MSSM, without any particular mass relations between sparticles. We identify the sparticle spectra for which the NLSP relic abundance is sufficiently small to avoid conflict with primordial nucleosythesis, but the relic abundance of the gravitinos is consistent with a reheating temperature allowing for thermal leptogenesis. This is possible e.g. in a scenario with bino-gluino mass degeneracy, in which there are strong coannihilations. We also briefly discuss the consequences of such NLSP-gluino mass degeneracy for the prospects of discovering supersymmetry at the LHC.

Speaker: Dr Krzysztof Turzynski (University of Warsaw)

Slides TurzynskiSusy10.ppt.ppt

14:34 Gravitino dark matter in the fully constrained NMSSM

The viability of a possible cosmological scenario is investigated. The theoretical framework is the constrained next-to-minimal supersymmetric standard model (cNMSSM), with a gravitino playing the role of the lightest supersymmetric particle (LSP) and a neutralino acting as the next-to-lightest supersymmetric particle (NLSP). All the necessary constraints from colliders and cosmology have been taken into account. For gravitino we have considered the two usual production mechanisms, namely out-of equillibrium decay from the NLSP, and scattering processes from the thermal bath. The maximum allowed reheating temperature after inflation, as well as the maximum allowed gravitino mass are determined.

Speaker: Dr Grigoris Panotopoulos (University of Valencia)

Slides panotopoulos-Bonn_SUSY2010.pdf

14:51 Strong CP problem reconciles Thermal Leptogenesis with Gravitino Dark Matter

Many extensions of the Standard Model predict super-weakly interacting particles, which typically have to decay before Big Bang Nucleosynthesis (BBN). The entropy produced in the decays may help to reconcile thermal leptogenesis and BBN in scenarios with gravitino dark matter, which is usually difficult due to late decays of the next-to-lightest supersymmetric particle (NLSP) spoiling the predictions of BBN. We study this possibility for a general neutralino NLSP. We elaborate general properties of the scenario and strong constraints on the entropy-producing particle. As an example, we consider the saxion from the axion multiplet and show that, while enabling a solution of the strong CP problem, it can also produce a suitable amount of entropy.

Speaker: Mr Jasper Hasenkamp (Hamburg University)

Slides hasenkamp-SUSY2010.pdf

15:08 Matter and Dark Matter from False Vacuum Decay

We study tachyonic preheating associated with the spontaneous breaking of B-L, the difference of baryon and lepton number. Reheating occurs through the decays of heavy Majorana neutrinos which are produced during preheating and in decays of the Higgs particles of B-L breaking. Baryogenesis is an interplay of nonthermal and thermal leptogenesis, accompanied by thermally produced gravitino dark matter. The proposed mechanism simultaneously explains the generation of matter and dark matter, thereby relating the absolute neutrino mass scale to the gravitino mass.

Speaker: Dr Gilles Vertongen (DESY Hamburg)

Slides vertongen_SUSY10-3.pdf

15:25 Sneutrino Hybrid Inflation and Nonthermal Leptogenesis

In sneutrino hybrid inflation the superpartner of one of the right-handed neutrinos involved in the seesaw mechanism plays the role of the inflaton field. It obtains its large mass after the 'waterfall' phase transition which ends hybrid inflation. After this phase transition the oscillations of the sneutrino inflaton field may dominate the universe and efficiently produce the baryon asymmetry of the universe via nonthermal leptogenesis. We investigate the conditions under which inflation, with primordial perturbations in accordance with the latest WMAP results, as well as successful nonthermal leptogenesis, can be realized simultaneously within the sneutrino hybrid inflation scenario. We point out which requirements successful inflation and leptogenesis impose on the seesaw parameters, i.e. on the Yukawa couplings and the mass of the right-handed (s)neutrino, and derive the predictions for the CMB observables in terms of the right-handed (s)neutrino mass and the other relevant model parameters.

Speaker: Ms Valerie Domcke (Max Planck Institut für Physik)

Slides Valerie_Domcke_SUSY2010.pdf

14:00 → 15:42 Collider 26-1 Chair: W. Porod

14:00 Performance of Etmiss reconstruction in first ATLAS data at a centre-of-mass energy of 7 TeV

The performance of the missing transverse energy (Etmiss) reconstructed with the ATLAS detector is assessed in proton-proton collisions at a centre-of-mass energy of 7 TeV. We report on results in randomly-triggered events, soft proton proton collisions and collisions with jets at high transverse momentum where Etmiss is expected to be zero. Particular attention is given to tails in the Etmiss distribution and a measurement of the Etmiss resolution. The performance of different calibration schemes developed by ATLAS and the individual terms contributing to Etmiss are discussed.

Speaker: Dr Travis Bain (University of Toronto)

Slides SUSY2010_ATLAS_EtMiss_Aug26_10.pdf

14:17 Gauge-mediated supersymmetry breaking with generalized messenger sector at LHC

We consider the generalized gauge mediated supersymmetry breaking (GMSB) models with the messenger fields which do not form the complete multiplets of SU(5) GUT symmetry. Such a situation may happen in the anomalous U(1) GUT scenario because the mass spectrum of the superheavy particle does not respect SU(5) GUT symmetry, although the success of the gauge coupling unification can be explained. In this paper, we assume that one pair of the messenger fields gives the dominant contribution, and the LHC signature for the two possible messengers, X + \bar{X} and Q + \bar{Q}, are examined. We investigate the possibility to measure the deviation from the usual GUT relation of the gaugino masses which is one of the most important features of these scenarios.

Speaker: Mr Hidetoshi Kawase (Nagoya University)

Slides kawase_susy10.pdf.pdf

14:34 Low Scale Gauge Mediation at Early LHC

Very light gravitino scenario m_{3/2} < 16 eV is very interesting, since there is no cosmological problem. In such a scenario, the stability of the vacuum is an important issue. However, it was observed that the masses of gaugino are relatively small in the model which has perturbatively stable vacuum. We show that such a model can be completely excluded/discovered at very early stage of the LHC run.

Speaker: Mr Ryosuke Sato (The University of Tokyo)

Slides SUSY2010_rsato.pdf

14:51 Searches for SUSY in Di-photon Events

We discuss prospects for SUSY searches with signatures involving two photons in the CMS experiment. We describe methodologies for such searches, as well as tests of data-driven background methods using early 7 TeV data samples. These methods are designed to establish the level of QCD background in the tail of the MET distribution.

Speaker: Ms Bernadette Heyburn (University of Colorado at Boulder)

Slides heyburn_cms.pdf

15:08 ATLAS early SUSY searches with photons and missing transverse energy

Searches for events with photons and missing transverse are motivated by a number of models for new physics, in particular models of gauge-mediated supersymmetry. We show first results of searches for supersymmetry in events with photons and missing transverse energy, with the ATLAS detector at the LHC. The performance of the ATLAS detector in identifying photons in first collision data is shown, and we take a early peek at the 7 TeV data set from a perspective oriented towards SUSY searches.

Speaker: Dr Dongliang Zhang (Hefei, China)

Slides DZhang_photon_MET_atlas.pdf

15:25 Impact of squark generation mixing on the search for superpartners at the LHC

In supersymmetric models that are embedded in grand unified theories, new sources of flavour violation may appear, beyond the hypothesis of minimal flavour violation where all flavour-changing interactions are related to the CKM-matrix. The corresponding new flavour mixing terms at the electroweak scale can induce interesting signatures at colliders. I will focus on non-minimal flavour violation in the squark sector of the MSSM. After discussing the model, I will discuss its influence on the mass spectrum and flavour decomposition of squarks. I will finally show examples of collider signatures that might allow to test the hypothesis of minimal flavour violation.

Speaker: Dr Björn Herrmann (DESY)

Slides Herrmann_Collider.pdf.pdf

14:00 → 15:42 Model Building 26-1 Chair: J. Kubo

14:00 Quark and lepton mixing angles with a dodeca-symmetry

The discrete symmetry D_12 at the electroweak scale is used to fix the quark and lepton mixing angles. At the leading order, the Cabbibo angle theta_C is 15^o, and the PMNS matrix is of a bi-dodeca-mixing form giving the Solar-neutrino angle theta_sol=30^o. Thus, there results the relation theta_sol+theta_C ~ 45^o. Out of discrete vacua, a certain vacuum is chosen for this assignment to be consistent with the dodeca-symmetry. A shift of theta_C from 15^o to 13.14^o might arise from a small breaking of the dodeca-symmetry.

Speaker: Mr Min-Seok Seo (Seoul National University)

Slides Seo-MSSeo.ppt

14:17 Radiative Flavor Violation

Recent experimental results such as the D0 measurement of the dimuon asymmetry in B_s decays hint at a flavor structure beyond that of the standard CKM mechanism. This development puts the supersymmetric flavor problem back on the agenda. I discuss an alternative to the widely studied minimally flavor violating MSSM, which cannot explain a large CP phase in B_s mixing: The smallness of the Yukawa couplings of the first two generations suggests the idea that these coupling might be induced by radiative corrections. This is possible within the MSSM where sfermion-gaugino loops involving the trilinear A-terms can generate the desired effective couplings. While this model of radiative flavour violation can solve the SUSY CP and flavour problems, it is not completely minimally flavor-violating. I discuss the phenomenological consequences of this model in the quark sector. Strong constraints come from Kaon mixing or b->s gamma and measurable effects in the rare Kaon decay K->pi nu nu are expected.

Speaker: Mr Andreas Crivellin (TTP Karlsruhe)

Slides crivellin-Bonn.ppt

14:34 Radiatively induced flavour violation in the general two-Higgs doublet model with Yukawa alignment

The most general two Higgs doublet model contains new sources of flavour violation that are usually in conflict with the experimental constraints. One possibility to suppress the exotic contribution to the flavour changing neutral currents consists on imposing the alignment of the Yukawa couplings. This condition presumably holds at a high-energy scale and is spoiled by the radiative corrections. We compute in this letter the size of the radiatively induced flavour violating Higgs couplings at the electroweak scale. These also yield the absolute lower bound on the size of the exotic contributions to the flavour changing neutral currents in any two Higgs doublet model, barring cancellations and the existence of discrete symmetries. We show that these contributions are well below the experimental bounds in large regions of the parameter space.

Speaker: Ms Carolin Barbara Braeuninger (Technische Universitaet Muenchen & Max-Planck-Institut fuer Physik)

Slides Braeuninger_neu.pdf

14:51 The flavor structure of UED with KK-parity

I will present recent work on the flavor structure in Universal Extra Dimensions (UED) with KK-parity. Specifically I will show how to construct a realistic model of fermion mass hierachies using loaclization of the wave functions in the extra dimesion. I will estimate the flavor bounds due to FCNCs and show that a lowering of the flavor scale requires mimicking a RS model with a double throat, in which the UV brane has been integrated out.

Speaker: Dr Johannes Heinonen (University of Chicago)

Slides SUSY10_v2.pdf

15:08 On the origin of neutrino flavour symmetry

Ever since Harrison, Perkins and Scott suggested that the neutrino mixing data could be approximated by the tri-bimaximal mixing matrix, there have been many proposals to explain its structure in terms of a discrete family symmetry. In this talk we discuss two classes of models - direct and indirect - which realise the effective neutrino flavour symmetry in different ways. We illustrate both possibilities in explicit models based on A4 and S4.

Speaker: Dr Christoph Luhn (University of Southampton)

Slides luhn-susy10.pdf

15:25 Beyond the Standard SUSY Seesaw

We present a supersymmetric scenario in which neutrino masses are effectively generated by Kahler operators, rather than by the usual d=5 superpotential operator. We also describe explicit realizations of such effective operators and discuss the case in which the heavy seesaw mediators are also messengers of SUSY breaking.

Speaker: Dr Andrea Brignole (INFN-Padova)

Slides brignole_bonn.pdf

14:00 → 15:42 Phenomenology 26-1 Chair: M. Spira

14:00 SUSY Predictions for the LHC and the ILC

We use currently available experimental data to determine the preferred Supersymmetry and Higgs boson mass scales. The data comprises electroweak precision observables such as the W boson mass and the anomalous magnetic moment of the muon, B physics observables such as BR(b -> s gamma), as well as the cold dark matter density in the universe. Within two GUT based realizations of the MSSM the preferred masses for SUSY particles as well as for the MSSM Higgs bosons are derived. We find a clear preference for relatively light SUSY masses. The preferred mass values can directly be compared to the reach of the LHC in the first 7 TeV run.

Speaker: Sven Heinemeyer (IFCA (CSIC, Santander))

Slides sven_mc.pdf

14:17 Effects of a light CP-odd Higgs on bottomonium spectroscopy and decays, and the light dark matter quest.

Mixing of a non-standard pseudoscalar light Higgs boson with eta_b states could both distort the bottomonium spectrum, sizeably altering the hyperfine splittings M[Y(nS)]-M[eta_b(nS)], and induce the decay of eta_b states into taus, also breaking lepton universality in Upsilon decays. Present experimental constraints from BaBar, CLEO, CDF and LEP will be reviewed in the talk, showing the corresponding exclusion limits for non-minimal supersymmetric extensions of the Standard Model. We will finally consider perspectives of searching for light Higgs-like particles at (Super) B factories and the LHC.

Speaker: Prof. Miguel-Angel Sanchis-Lozano (University of Valencia)

Slides Susy10_Sanchis_2.pdf

14:34 Higgs production in the (complex) MSSM via vector boson fusion

Higgs production via vector boson fusion is expected to be a very important process at the LHC, both as a discovery channel and as a method of examining the trilinear coupling between weak bosons and a Higgs. Complete one-loop virtual corrections to the production of all neutral Higgs bosons have been combined with two-loop Higgs propagator corrections and contributions due to real emission in both the Standard Model and the (complex) MSSM. Additionally, specifically SUSY decays of the Higgs boson are considered. These have been implemented into the Monte Carlo program VBFNLO.

Speaker: Dr Sophy Palmer (ITP, University of Karlsruhe)

Slides SophyPalmer.pdf

14:51 The interplay between Higgs and squark-gluino events at the LHC

In some extensions of the standard model with extended Higgs sectors, events from new particle production may pass the selection criteria for Higgs search in different channels at the LHC-14 TeV and mimic Higgs signals. This intriguing possibility is illustrated by Pythia based simulations using several representative points in the parameter space of the minimal supersymmetric standard model (MSSM) including a point in the minimal supergravity model consistent with the darkmatter relic density data. Our simulations explore the interplay between the charged Higgs signal and typical squark-gluino events. We argue that the standard selections like the one based on the polarization properties of the $\tau$'s from charged Higgs decay, though adequate for handling the SM background, may not be very efficient in the presence of SUSY backgrounds. We then propose an alternative search strategy based on kinematics only which sufficiently controls both the SM and the MSSM backgrounds. For charged Higgs masses in the deep deccoupling regime ($600 GeV \lsim m_H \lsim 800 GeV$)this method works well and extends the LHC reach close to 8OO GeV for an integrated luminosity of $30 fb ^{-1}$ with or without the SUSY background. For a lighter charged Higgs a judicious combination of the old selections and some of the cuts proposed by us may disentangle the Higgs signal from the squark-gluino backgrounds quite effectively.

Speaker: Prof. Amitava Datta (IISER-Kolkata, India)

Slides datta-tifr-1.pdf

15:25 Higgs Measurements in and beyond the SM at the LHC in the Forward Proton Mode

We review the prospects for Central Exclusive Diffractive (CED) production of BSM Higgs bosons at the LHC using forward proton detectors installed at 220 m and 420 m distance around ATLAS and / or CMS. We update previous analysis for the MSSM taking into account current improvements in the theoretical calculations and the most recent exclusion bounds from the Tevatron. We extend the MSSM analysis to new benchmark scenarios that are in agreement with the cold dark matter relic abundance and other precision measurements. We analyse the exclusive production of Higgs bosons in a model with a fourth generation of fermions. Finally, we discuss the determination of Higgs spin-parity and coupling structures at the LHC and show that the forward proton mode would provide a critical information on the CP properties of the Higgs bosons.

Speaker: Sven Heinemeyer (IFCA (CSIC, Santander))

Slides sven_diffH.pdf

15:42 → 16:12 Coffee break

16:12 → 18:12 Astro 26-2 Chair: K. Zurek

16:12 Improved Constraints on Inelastic Dark Matter

I perform a study of the DAMA annual modulation data in the context of inelastic dark matter. I find that inelastic dark matter with mass m > 15 GeV is excluded at high significance by the combination of DAMA spectral information and results from other direct detection experiments. However, at smaller m, inelastic dark matter constitutes a possible solution to the DAMA puzzle.

Speaker: Mr Martin Wolfgang Winkler (TU München)

Slides winkler.pdf

16:29 Strong dark matter constraints on GMSB models

We reconsider the dark matter problem in supersymmetric models with gauge mediated supersymmetry breaking, with and without R-parity breaking. In these classes of models, a light gravitino forms the dark matter.Consistency with the experimental data, in particular the dark matter abundance and the small-scale power spectrum, requires additional entropy production after the decoupling of the gravitino from the thermal bath. We demonstrate that the usual mechanism via messenger number violating interactions does not work in models where the messenger belongs to SU (5) representations. This is mainly a consequence of two facts: (i) there are at least two different types of lightest messenger particles and (ii) the lightest messenger particle with SU (2) quantum numbers decays dominantly into vector bosons once messenger number is broken, a feature which has been overlooked so far. In case of SO(10) messenger multiplets we find scenarios which work if the SM gauge singlet component is rather light.

Speaker: Mr Florian Staub (University Wuerzburg)

Slides SUSY_2010_Staub.pdf

16:46 Potentially Large One-loop Corrections to WIMP Annihilation

We compute one--loop corrections to the annihilation of non--relativistic particles $\chi$ due to the exchange of a (gauge or Higgs) boson $\varphi$ with mass $\mu$ in the initial state. In the limit $m_\chi \gg \mu$ this leads to the ``Sommerfeld enhancement'' of the annihilation cross section. However, here we are interested in the case $\mu \lsim m_\chi$, where the one--loop corrections are well--behaved, but can still be sizable. We find simple and accurate expressions for annihilation from both $S-$ and $P-$wave initial states; they differ from each other if $\mu \neq 0$. In order to apply our results to the calculation of the relic density of Weakly Interacting Massive Particles (WIMPs), we describe how to compute the thermal average of the corrected cross sections. We apply this formalism to scalar and Dirac fermion singlet WIMPs, and show that the corrections are always very small in the former case, but can be very large in the latter. Moreover, in the context of the Minimal Supersymmetric Standard Model, these corrections can decrease the relic density of neutralinos by more than 1\%, if the lightest neutralino is a strongly mixed state.

Speaker: Dr Ju Min Kim (University Bonn)

Slides juminkim.pdf

17:03 Supersymmetric QCD effects on dark matter annihilation: Recent developments

The possibility to compute the relic density of the dark matter candidate is an interesting possibility to constrain the parameter space of supersymmetric models and to obtain complementary information with respect to collider searches and precision measurements. On the particle physics side of this calculation, the main uncertainty is due to the annihilation cross-section of the dark matter candidate, which can receive important corrections at the loop-level. I will present recent developments in the calculation of supersymmetric QCD corrections to the neutralino pair annihilation within the MSSM. I will discuss their impact on the annihilation cross-section and the resulting prediction for the relic density of the neutralino. Finally, I will show that the effect of the corrections is more important than the current experimental uncertainty of the WMAP measurements. In consequence, including the radiative corrections will become even more important when the satellite Planck will allow to determine the cosmological parameters with much better accuracy.

Speaker: Dr Björn Herrmann (DESY)

Slides Herrmann_Astro.pdf

17:20 Sommerfeld and Sudakov corrections in heavy neutralino annihilation

We have computed the full one-loop corrections (electroweak as well as QCD) to processes contributing to the relic density of dark matter in the MSSM where the LSP is the lightest neutralino. We cover scenarios where the neutralino is a bino-higgsino one with mass around 500 GeV and an almost pure wino with a mass of order 2 TeV. In the wino case the radiative corrections exhibit important effects occurring in the non-relativistic regime as well as the ultra- relativistic one. This is due on the one hand to Sommerfeld Electroweak enhancement and on the other hand to Sudakov double logarithms corrections. The corrections can have a non- negligible impact on the predictions and should be taken into account in view of the present and forthcoming increasing precision on the relic density measurements. Our calculations are made with the help of SloopS , an automatic tool for the calculation of one-loop processes in the MSSM.

Speaker: Mr Guillaume Chalons (LAPTH)

Slides susy10_chalons.pdf

17:37 Dark matter relic density at one loop level - effective coupling approach

The lightest neutralino as a cold dark matter candidate has been widely studied. Generally, tree-level calculations of its (co-)annihilation cross sections are used to predict the relic density, which leads to constraints on the parameter space. It has been known that these cross sections can change by order 10% at one loop level. However, calculating these one loop corrections is computationally demanding and time consuming due to large number of diagrams. On the other hand, with the launch of the Planck satellite the relic density of dark matter will be experimentally determined at a percent accuracy. Matching this accuracy requires the inclusion of at least leading radiative corrections. We use the approach of effective couplings in order to reduce the computational stress. In this work, we estimate the resulting corrections to the predicted neutralino relic density, and investigate the available parameter space at one loop level.

Speaker: Ms Suchita Kulkarni (Physics Institute, University of Bonn)

Slides Kulkarni-SUSY10.pdf

16:12 → 18:12 Collider 26-2 Chair: P. Wienemann

16:12 Effective Supersymmetry at the LHC

We investigate the phenomenology of Effective Supersymmetry (ESUSY) models wherein electroweak-inos and wherein third generation scalars have sub-TeV masses while first and second generation scalars lie in the multi-TeV range. Such models ameliorate the SUSY flavor and CP problems via a decoupling solution, while at the same time maintaining naturalness. Toward this end, we assume independent GUT scale mass parameters for third and first/second generation scalars and for the Higgs scalars, in addition to $m_{1/2}$, $\tan\beta$ and $A_0$, and require radiative electroweak symmetry breaking as usual. We scan the parameter space using the Markov Chain Monte Carlo and pick out regions that lead to an ESUSY spectrum, consistent with current constraints. The lightest MSSM particle (LMP) is often, but not always the lightest neutralino, and moreover, the thermal relic density of the neutralino LMP is frequently very large. These models may phenomenologically be perfectly viable if the LMP before nucleosynthesis decays into the axino and SM particles. Dark matter is then an axion/axino mixture. At the LHC, the most important production mechanisms are gluino production (for $m_{1/2} \alt 700$~GeV) and third generation squark production, while SUSY events rich in $b$-jets are the hallmark of the ESUSY scenario. We examine the LHC phenomenology of ESUSY models by performing studies of benchmark points with characteristic features.

Speaker: Mr Andre Lessa (University of Oklahoma)

Slides LessaSUSY10.pdf.pdf

16:29 SUSY without prejudice at the LHC

We investigate the LHC signals of the models obtained in our exploration of the general CP-conserving MSSM with Minimal Flavor Violation, the pMSSM. The models studied were obtained by scanning 19 soft SUSY breaking parameters, chosen to satisfy all existing experimental and theoretical constraints assuming that the WIMP is a conventional thermal relic, i.e., the lightest neutralino. The properties of the SUSY partners encompass a broader range than found in any of the conventional SUSY breaking scenarios such as mSUGRA. As a result, they lead to many unusual expectations for SUSY signals at the LHC. We provide an update of our analysis of the LHC signatures of this model set. We present a summary of the lessons to be learned for SUSY searches at the LHC, and discuss some unique models in detail.

Speaker: Dr John Conley (Universität Bonn)

Slides conley.pdf

16:46 SUSY mass determination using kinematic fits

In R-parity conserving SUSY models a typical event topology at colliders will be the cascade decay of the two produced SUSY particles. Depending on the SUSY model cascade decays via SUSY particles of equal or similar masses at one particular position in the decay chains might occure with a high abundance. For the kinemtics of all events the few masses of the involved SUSY particles are unknowns. The momentum components of the LSPs are also unknown parameters but unique for each event. If the cascades are sufficiently long, e.g. enough mass constraints are available, then the problem can be overconstrained by making use of a large number of events. If an efficient selection of these events is possible one can utilize kinematic fits to determine the masses of the involved SUSY particles. In this talk new techniques are presented for the solution of this problem. First results using toy Monte Carlo data will be presented.

Speaker: Mr Benedikt Mura (University of Hamburg)

Slides Mura_SUSY_2010.pdf

17:03 Prospects for observing CP violating Higgs at Tevatron and LHC

We analyze the prospect for observing the intermediate neutral Higgs ($h_2$) boson in its decay to two lighter Higgs bosons ($h_1$) at the Hadron Colliders in the framework of the CP violating MSSM using the PYTHIA event generator. We consider the lepton+ 4-jets+ missing energy channel from $p \bar p \ra W h_2 \ra W h_1 h_1 \ra l \nu_l b \bar b b\bar b$, with two or three tagged $b$-jets. We treated $c$-jets separately from other light flavor jets and employed the mis-tagging criterion. We explicitly considered all possible Standard Model backgrounds. We found that it is very hard to observe this signature in the LEP-allowed region of parameter space, even though the background is manageable, due to the small signal efficiency at Tevatron. By applying judiciously kinematical selections, we suppressed huge backgrounds and left with a few ten signal events at LHC. Requiring $m_{h_2} \lsim 140$ GeV leads the total background comparable to signal. Our analysis show that the Higgs signal at LHC might be show up over the backgrounds in the vicinity of present LEP exclusion.

Speaker: Dr Siba Prasad Das (AHEP,IFIC, University of Valencia)

Slides spd_SUSY.pdf

17:20 Higgs Production under CP-violating SUSY cascade decays

We will discuss the Higgs production under supersymmetric cascade. Specially some rare decays are possible in case of CP-violating MSSM. These decays can lead to Higgs production with some non-trivial signal topologies. We will investigate the possibility of these signal and their significance considering the dominant backgrounds at the LHC. Integrated luminosity of 10 fb^{-1} is sufficient for some of bench mark points

Speaker: Dr PRIYOTOSH BANDYOPADHYAY (RESEARCH FELLOW)

Slides bandyo-talksusy.pdf

17:37 Testing supersymmetric neutrino mass models at the LHC

We study the supersymmetric version of the different seesaw mechanisms assuming minimal supergravity boundary conditions. We calculate branching ratios for lepton flavour violating (LFV) scalar tau decays, potentially observable at the LHC, as well as LFV decays at low energy, such as mu -> e gamma and compare their sensitivity to the unknown seesaw parameters. We also discuss how measurements of soft SUSY breaking parameters at the LHC can be used to indirectly extract information on the seesaw type realized as well as on the seesaw scale.

Speaker: Werner Porod (Universität Würzburg)

Slides Vortrag.pdf

16:12 → 18:11 Model Building 26-2 Chair: J. Reuter

16:12 Minimal Superconformal Technicolor and the Origin of Mass

Our recent proposal for an approximately N=4 supersymmetric extension of the MSSM will be reviewed. Depending on the soft supersymmetry breaking parameters and the size of the technicolor coupling, the electroweak scale is stablized either by supersymmetry or by nonperturbative technicolor dynamics. Within the model one can naturally interpolate between the MSSM, bosonic technicolor extensions of the SM and an unparticle model.

Speaker: Mr Matti Antola (University of Helsinki, HIP)

Slides MSCT_Bonn.pdf

16:29 Minimal Super Conformal Technicolor at the LHC

We study the Minimal Super Conformal Technicolor (MSCT) in the perturbative regime and show that breaking electroweak symmetry solely by Higgs mechanism does not allow MSCT to satisfy the experimental constraints while retaining perturbativity at the LHC scale. We conclude that a dynamical contribution to electroweak symmetry breaking is necessary for the model to be possibly viable at the LHC.

Speaker: Dr Stefano Di Chiara (CP3-Origins, Southern Denmark University)

Slides MSCT_at_LHC.pdf

16:46 Beyond the Minimal Composite Higgs Model

The composite Higgs mechanism is a very well motivated scenario for electroweak symmetry breaking. The Higgs boson emerges as a (massless) Nambu-Goldstone boson (NGB) from a spontaneous global symmetry breaking in a strongly interacting sector living at the TeV scale, providing an elegant solution to the hierarchy problem. After a brief review on how the minimal version of this scenario, based on the SO(5)/SO(4) coset, can successfully pass all the electroweak precision tests and solve the flavor problem, I will present several non-minimal coset extensions, which exhibit a richer spectrum of pseudo-NGB's, with very interesting phenomenology.

Speaker: Mr Javi Serra (Universitat Autònoma de Barcelona)

Slides susy10_jserra.pdf

17:03 Hidden two-Higgs doublet model

We present a two-Higgs doublet model where only one of the doublets gets a vacuum expectation value and there is a softly broken Z2 symmetry. In this "hidden doublet model", the CP-even states h and H mix, and therefore they both couple to fermions, whereas the hidden states A0 and H+ only couple to fermions via gauge boson-Higgs loops and thus these couplings are strongly suppressed. Our model shares some features with the inert doublet model of Barbieri, Hall and Rychkov, in that it allows h and/or H to be heavy and still satisfy the electroweak precision tests, but since the Z2 symmetry is softly broken, none of the scalars is stable. The model leads to a very interesting Higgs phenomenology. Apart from the possibility of having a heavy h and/or H and thus improving the naturalness of the Higgs sector, the hidden states A0 and H+ may predominantly decay into four fermions via off-shell gauge and Higgs bosons. On the one hand this means that A0 and/or H+ can be very light, so that they may have been produced at LEP but not detected due to the non-standard decay modes. Another possibility is that one of the CP-even Higgs bosons, h or H, is light but has escaped detection because it decays to A0 A0 or H+ H-, which decay in the four fermion modes already mentioned. We have calculated the decays of the hidden states into four fermions at tree level and to two fermions at at one-loop level and also considered electroweak and other experimental constraints on the parameter space of the model.

Speaker: Dr Johan Rathsman (Uppsala University)

Slides rathsman.pdf

17:20 Bounds on R-parity Violating Couplings at the Grand Unification Scale from Neutrino Masses

We consider the embedding of the supersymmetric Standard Model with broken R-parity in the minimal supergravity model. We restrict ourselves to the case of broken lepton number, the B3 mSUGRA model. We find in particular a strong dependence on the trilinear supersymmetry breaking A-parameter, even in the vicinity of the mSUGRA SPS1a point. We then reinvestigate the bounds on the trilinear R-parity violating couplings at the unification scale from the low-energy neutrino masses including dominant one-loop contributions. These bounds were previously shown to be very strict, as low as O(10^{-6}) for SPS1a. We show that these bounds are significantly weakened when considering the full mSUGRA parameter space. In particular the ratio between the tree-level and 1-loop neutrino masses is reduced such that it may agree with the observed neutrino mass hierarchy. We discuss in detail how and in which parameter regions this effect arises.

Speaker: Ms Marja Hanussek (Uni Bonn)

Slides hanussek.pdf

17:37 The minimal B-L model naturally realized at TeV scale

Under a hypothesis of classically conformal theories, we investigate the minimal B-L extended Standard Model, which naturally provides the seesaw mechanism for explaining tiny neutrino masses. In this setup, electroweak symmetry breaking is triggered by radiative B-L symmetry breaking. The model naturally predicts TeV scale B-L breaking as well as a light standard-model singlet Higgs boson and right-handed neutorinos around the same energy scale.

Speaker: Mr Yuta Orikasa (SOKENDAI, KEK)

Slides orikasa.pdf

16:12 → 18:12 Phenomenology 26-2 Chair: S. Kraml

16:12 MSSM Higgs Boson Production via Gluon Fusion

At the LHC one of the major production channels of neutral Higgs bosons is gluon fusion. The process is loop-induced where the coupling of the gluons to the Higgs bosons is mediated by heavy quark and squark loops. Higher order QCD contributions have turned out to be large. Recently, the full supersymmetric QCD corrections at next-to-leading order have been obtained including the full mass dependence of the loop particles. First results of this calculation will be shown. Also, a conceptual problem, i.e. the proper treatment of the large gluino mass limit, will be addressed.

Speaker: Heidi Rzehak (Institut fuer Theoretische Physik, KIT)

Slides SUSY10.pdf

16:29 BMSSM Higgs Bosons

We study extensions of the Minimal Supersymmetric Standard Model (MSSM) with new degrees of freedom that couple sizably to the MSSM Higgs sector and lie in the TeV range. After integrating out the physics at the TeV scale, the resulting Higgs spectrum can significantly differ from typical supersymmetric sce- narios, thereby providing a window Beyond the MSSM (BMSSM). Taking into account current LEP and Tevatron constraints, we perform an in-depth analysis of the Higgs collider phenomenology and explore distinctive characteristics of our scenario with respect to both the Standard Model and the MSSM. We propose benchmark scenarios to illustrate specific features of BMSSM Higgs searches at the Tevatron and the LHC.

Speaker: Dr Jose Zurita (University of Zurich)

Slides Zurita_SUSY_2010.pdf

16:46 HFOLD a program package for calculating MSSM two-body Higgs decays at full one-loop level

HFOLD (Higgs Full One-Loop Decays) is the first public available program which calculates all MSSM Higgs two-body decays at full one-loop level. The renormalization is done in the DRbar scheme following the SPA convention. The program is easy to use and supports Les Houches in- and output format. We compare the numerical results from HFOLD with some other public available programs. Particular attention is paid to the size of the electroweak corrections.

Speaker: Mr Wolfgang Frisch (HEPHY Vienna)

Slides HFOLD_wfrisch.pdf

17:03 CP-violation in stop cascade decays at the LHC

We study the potential to observe CP-violating effects in top squark cascade decay chains at the LHC. Asymmetries composed by triple products of momenta of the final state particles are sensitive to CP-violating effects. Due to large boosts that dilute the asymmetries, these can be difficult to observe. If all particle masses in a cascade decay are known, it may be possible to reconstruct the decay chains on an event-by-event basis even when we have missing momentum due to the LSP. After the reconstruction, the CP violating signal gets significantly enhanced and an observation may become feasible. The most important background and experimental effects have been included.

Speaker: Mr Krzysztof Rolbiecki (IPPP Durham)

Slides rolbiecki.pdf

17:20 Testing the Supersymmetric Coupling Relations with Monojets at the LHC

If Supersymmetry (SUSY) exists in nature, the LHC might find first evidence for it within the next few years. After new physics phenomena are discovered, there will be many proposed explanations including supersymmetric models that will be consistent with the initial discovery. It is critical to identify observables that can provide direct evidence for an underlying supersymmetric dynamics. SUSY predicts the gauge couplings and the corresponding Yukawa couplings between fermions, sfermions and gauginos to be equal. We show that monojets at LHC provide a test of the U(1) and the SU(2) coupling relations. We investigate the regions of the MSSM parameter space, where such a test is possible. We found that scenarios with a wino-like lightest supersymmetric particle are the most promising ones due to an enhanced monojet cross section.

Speaker: Dr Sebastian Grab (University of California, Santa Cruz)

Slides SGrab3.pdf

17:37 The MSSM with degenerate (GUT scale) Higgs mass matrix

Certain supersymmetric grand unified models predict that the coefficients of the quadratic terms in the MSSM Higgs potential should be degenerate at the GUT scale. We discuss some examples for such models, and we analyse the implications of this peculiar condition of a GUT-scale degenerate Higgs mass matrix for low-scale MSSM phenomenology. To this end we explore the parameter space which is consistent with existing experimental constraints by means of a Markov Chain Monte Carlo analysis. This talk is based on arXiv:1007.0321 and JHEP 0908:011 .

Speaker: Mr Sylvain Fichet (LPSC)

Slides FICHET_DHMM.ppt

19:00 → 23:00 Conference dinner

Friday, 27 August

09:00 → 09:30 Yukawa-Unified SUSY, S. Kraml

Plenary talk
Chair: G. Degrassi

slides Kraml-SUSY10-web.pdf

09:35 → 10:05 Physics in the MSSM with Complex Parameters, G. Weiglein

Plenary talk
Chair: G. Degrassi

slides weiglein-susy10.pdf

10:10 → 10:40 Precision Calculations for SUSY Searches at Hadron Collider, M. Krämer

Plenary talk
Chair: G. Degrassi

slides mkraemer_SUSY10.pdf

10:45 → 11:15 Coffee break

11:15 → 11:45 NMSSM and Strings, O. Lebedev

Plenary talk
Chair: M. Olechowski

slides lebedev.pdf

11:50 → 12:20 Anomalous Discrete Symmetries, M. Ratz

Plenary talk
Chair: M. Olechowski

slides SUSY10_Ratz.pdf

12:25 → 12:55 SUSY Breaking and the Pattern of Sparticle Masses at the LHC, K. Choi

Plenary talk
Chair: M. Olechowski

slides SUSY10_CHOI.pdf

13:00 → 14:00 LUNCH

14:00 → 15:42 Astro 27-1 Chair: K. Cheung

14:00 Relic density determination at the LHC

The neutralino is the lightest supersymmetric particle in many SUSY models. Thus in R parity conserving models it provides a perfect dark matter candidate by being electromagnetically neutral, weakly interacting and stable. Following cosmological models, at the freeze-out time most neutralinos should have been transformed into standard model particles by annihilation. The annihilation cross section is inversely proportional to the observed dark matter density and thus precisely known. In case SUSY will be discovered at the LHC, it is not a proof that the neutralino is the dark matter existing in the universe. But to get a hint one can try to determine the neutralino an- nihilation cross section from LHC data and see if it is consistent with the annihihilation cross section corresponding to the relic density, as discussed above. It is shown that in a large region of parameter space this cross section is dominated by pseudos- calar Higgs exchange and the correct value can only be obtained for values of tanβ around 50. This would lead o a large cross section for pseudoscalar Higgs production, which is proportional to tanβ squared. This cross section or the width of the pseudoscalar Higgs can be exploited to determine tanβ and thus determine the annihilation cross section in the regions without co-annihilation or very light squarks and sleptons. In the latter case the t-channel would dominate, but this region is already excluded by the Higgs limits and other electroweak constraints.

Speaker: Eva Ziebarth (Karlsruhe Institute of Technology)

Slides SUSY-10.pdf

14:17 Effects of Residue Background Events in Direct Detection Experiments on Identifying WIMP Dark Matter

We reexamine the model-independent data analysis methods for extracting properties of Weakly Interacting Massive Particles (WIMPs) using data (measured recoil energies) from direct Dark Matter detection experiments directly and, as a more realistic study, consider small fractions of residue background events, which pass all discrimination criteria and then mix with other real WIMP-induced signals in data sets. In this talk, the effects on the determination of the mass of halo Dark Matter particles as well as their spin-independent couplings on nucleons will be discussed.

Speaker: Dr Chung-Lin Shan (Department of Physics, National Cheng Kung University)

Slides DM-DD-background-SUSY10.pdf

14:34 Light dark matter in the NMSSM: upper bounds on direct detection cross sections

In the Next-to-Minimal Supersymmetric Standard Model, a bino-like LSP can be as light as a few GeV and satisfy WMAP constraints on the dark matter relic density in the presence of a light CP-odd Higgs scalar. We study upper bounds on direct detection cross sections for such a light LSP in the mass range 2--20~GeV in the NMSSM, respecting all constraints from B-physics and LEP. The OPAL constraints on $e^+ e^- \to \chi^0_1 \chi^0_i$ ($i > 1$) play an important r\^ole and are discussed in some detail. The resulting upper bounds on the spin independent and spin dependent nucleon cross sections are $\sim 10^{-42}$~cm$^{-2}$ and $\sim 4\cdot 10^{-40}$~cm$^{-2}$, respectively

Speaker: Dr Debottam Das (Laboratoire de Physique Theorique d'Orsay (LPT, Orsay))

Slides nmssm_dm.pdf

14:51 Latest results from the EDELWEISS direct Dark Matter search

EDELWEISS-2 is the second phase of a Ge-bolometer experiment located in the underground laboratory Laboratoire Souterrain de Modane (LSM, France). New cryogenic detectors with an improved background rejection (interleaved electrodes design, Phys. Lett. B681 (2009) 305) have been successfully implemented. A continuous operation of ten of these bolometers at LSM together with an active muon veto shielding has been achieved in 2009/2010. First results based on an effective exposure of 144 kg•d taken in 2009 have been published recently (Phys. Lett. B687 (2010) 29) and more than 300 kg•d have been acquired up to May 2010. The published data correspond to an improvement in sensitivity of almost 20 compared to EDELWEISS-1. We present and discuss the latest bolometer data including the identification of muon-induced background events in LSM. This work is supported in part by the German Research Foundation (DFG) through its collaborative research center SFB-TR27 ("Neutrinos and Beyond"), by the French Agence Nationale pour la Recherche (ANR) and the Russian Foundation for Basic Research (grant No. 07-02-00355-a).

Speaker: Dr Klaus Eitel (Karlsruhe Institute of Technology)

Slides Eitel_Edelweiss.pdf

15:08 Searches for Dark Matter with the IceCube Neutrino Telescope

IceCube is a km^3 scale neutrino detector being constructed deep in the Antarctic ice. When complete, IceCube will consist of over 5000 optical modules deployed on 86 strings between 1450 and 2450 m of depth. Of these, 6 strings will comprise a densely packed subarray of high efficiency modules in the deepest, clearest ice called DeepCore, which will extend the sensitivity of neutrino searches below 100 GeV. After a successful deployment season, IceCube is currently running in a 79 string configuration. IceCube can be used to indirectly probe the spin-dependent dark matter-nucleon scattering cross-section as well as the self-annihilation cross-section. Data taken with partial detector configurations has been used to search for neutrino signals of dark matter annihilations in the sun, halo, and galactic center. We present the current state of these searches as well as the projected sensitivity of the full detector.

Speaker: Dr Erik Strahler (Vrije Universiteit Brussel)

Slides SUSY_2010.pdf

15:25 Leptophilic Dirac gaugino dark matter

We investigate the leptophilic properties of Dirac gauginos in a R-symmetric N=2 supersymmetric model with extended gauge and Higgs sectors. The annihilation of Dirac gauginos to leptons requires no chirality flip in the final states so that it is not suppressed as in the Majorana case. This implies that it can be sizable enough to explain the positron excess observed by the PAMELA experiment with moderate or no boost factors. When squark masses are heavy, the annihilation of Dirac gauginos to hadrons is controlled by their Higgsino fraction and is driven by the $hZ$ and $W^+W^-$ final states. Moreover, at variance with the Majorana case, Dirac gauginos with a non-vanishing Higgsino fraction can also have a vector coupling with the $Z$ gauge boson leading to a sizable spin-independent scattering cross section off nuclei. Saturating the current antiproton limit, we show that Dirac gauginos can leave a signal in direct detection experiments at the level of the sensitivity of dark matter searches at present and in the near future.

Speaker: Dr Jong-Chul Park (KIAS)

Slides JCPark_DiracGaugino.pptx

14:00 → 15:42 Collider 27-1 Chair: S. Grab

14:00 Same-sign multileptons at the LHC

We point out that same-sign multilepton events, not given due attention yet for new physics search, can be extremely useful at the Large Hadron Collider. After showing the easy reducibility of the standard model backgrounds, we demonstrate the viability of same-sign trilepton signals for R-parity breaking supersymmetry, at both 7 and 14 TeV. We find that same-sign four-leptons, too, can have appreciable rates. Same-sign trileptons are also expected, for example, in Little Higgs theories with T-parity broken by anomaly terms.

Speaker: Mr Satyanarayan Mukhopadhyay (Harish-Chandra Research Institute)

Slides SS3l.pdf.pdf

14:17 LHC Collider Signatures with a decaying selectron-LSP in RPV mSUGRA

In R-parity violating (RPV) supersymmetry the lightest supersymmetric particle (LSP) may in principle have charge and/or flavor. I explore possible scenarios with a selectron-LSP within the RPV-mSUGRA model. The LSP decays in the detector. I shall present the relevant collider signatures. A promising search strategy for the LHC would be a trilepton analysis which I will present in detail.

Speaker: Mr Tim Stefaniak (BCTP Bonn)

Slides Stefaniak_SelectronLSP_SUSY10.pdf

14:34 Supersymmetry with Trilinear R-Parity Violation at the LHC

If Supersymmetry is realized in nature, there is no need for R-Parity to be exactly conserved. In this case, for a wide range of couplings, the MSSM production and cascade decay of sparticles would be followed by a three-body neutralino decay through trilinear R-Parity violating operators. Since neutralinos couple to all fermions and thus can potentially decay through all 45 trilinear R- violating operators, this channel is optimal for the simultaneous study of all couplings and their respective hierarchies. The goal of this study, therefore, is to extract the flavour structure of these operators from LHC data.

Speaker: Mr Nils-Erik Bomark (University of Bergen)

Slides NilsErikBomark_slides.pdf

14:51 Discovery potential with early LHC data for R-parity violating mSUGRA with stau-LSP

A well motivated model is R-parity violating minimal supergravity (mSUGRA). In this model, lepton number is violated and the lightest supersymmetric particle (LSP) is non-stable and can thus be charged. We investigate the discovery potential at the LHC of two benchmark scenarios of R-parity violating mSUGRA with a stau-LSP. The scenarios differ in their R-parity violating coupling and can be considered as two extreme cases of RPV mSUGRA with stau-LSP, where the LSP decays promptly. In the first scenario the LSP undergoes a four-body decay into leptons, whereas it decays into two light quarks in the second scenario. Fast detector simulations of the ATLAS experiment have been used to evaluate the discovery significance at a center of mass energy of 7TeV and an integrated luminosity of 1fb-1 taking the most important Standard Model backgrounds into account. With scans in the mSUGRA parameter space around the benchmark scenarios we show, that RPV mSUGRA can be discovered at the LHC within the first years of operation in certain parameter ranges. The possibility of the measurement of the stau mass is investigated and the special problems due to combinatorial background in one of the scenarios are highlighted. We shortly discuss the specific demands on the tau lepton identification in the signal events.

Speaker: Sebastian Fleischmann (University of Bonn)

Slides 100827-SUSY10-RPV-stau-LSP-fleischmann.pdf

15:08 Searches for R-parity violating SUSY at HERA

H1 experiment at HERA released recently preliminary results on SUSY searches in ep collisions using the full data set from HERA II run. This represents an increase by up to a factor of 10 in luminosity in electron-proton collisions and a factor of 3 in positron-proton collisions compared to previous studies. The searches address models with RP-violation, where squarks can be produced in e-quark fusion and could be identified at HERA using both Rp-violating decays and decays via gauginos, covering therefore close to 100% of the decay width. The searches are complementary to similar studies at other colliders and extend into so far unexplored regions of the phase space.

Speaker: Mr Michael Herbst (H1 Collaboration)

Slides Herbst-SUSY10.pdf

15:25 Top Quark Physics at CDF

A method of reconstructing t-tbar events in the lepton plus jets decay mode is applied to a measurement of the forward backward asymmetry in t- tbar pair production at CDF. The measurement is a test of discrete symmetries in t-tbar production and strong interactions at large Q^2. In the present data set it is potentially sensitive to the presence of parity-violating production channels such as a massive Z'- like boson or new physics within strong interactions. We present a measurement of the top quark forward-backward asymmetry in over 5 fb-1 of collected CDF Run II data.

Speaker: Dr Tom Schwarz (Univ.of California, Davis)

Slides schwarz-SUSY_2010.pdf

14:00 → 15:42 Model Building 27-1 Chair: O. Lebedev

14:00 FCNC in non-Abelian discrete flavor symmetry with SUSY

This talk based on "Tri-bimaximal Mixing and Cabibbo Angle in S(4) Flavor Model with SUSY", arXiv:1004.5004 (PRD in press 2010), "Non-Abelian Discrete Symmetries in Particle Physics", Prog. Theor. Phys. Supplement, No. 183 (2010), and "Delta(54) Flavor Model for Leptons and Sleptons", JHEP 0912:054, 2009. These works are collaborated with Tatsuo Kobayashi, Morimitsu Tanimoto, et al. Non-Abelian discrete symmetry can lead to tri-bimaximal mixing, since non-Abelian discrete symmetry connects different generations. Especially, A(4) flavor symmetry gives the tri-bimaximal mixing at first. However, it is difficult to explain mixing of both quarks and leptons clearly. Therefore, our purpose is building a new model with non-Abelian discrete flavor symmetry S(4), which can explain both lepton mixing and quark mixing. Then, we present a flavor model of quarks and leptons with the non-Abelian discrete symmetry S(4) in the framework of the SU(5) SUSY GUT. We predict the Cabibbo angle as well as the tri-bimaximal mixing of neutrino flavors. The non-Abelian discrete flavor symmetry constrains not only quark/lepton mass matrices, but also mass matrices of their superpartner, i.e. squark/slepton. Then, we study SUSY breaking terms in the slepton sector. Our model suppresses flavor changing neutral currents compared with the present experimental bounds.

Speaker: Mr Yusuke Shimizu (Graduate School of Science and Technology, Niigata University)

Slides SUSY10.pdf

14:17 New constraints on the flavour structure of left-handed squarks

In the light of recent experimental anomalies indicating a non-zero Bs-Bs-bar mixing phase I present a fresh look at meson-antimeson mixing in the MSSM. I present a new analysis of the up-type and down-type squark mass matrices with focus on constraints on the mass splittings among the first two generations of left-handed squarks. If the gluino is heavier than the squarks, the conventionally studied squark-gluino box contributions are small and can even vanish. This has two important consequences: First, the mass splittings between squarks of different generations can become large because of a suppressed super-GIM mechanism. Second, the SU(2) symmetry linking the chargino contributions in Bd mixing and Bs mixing leads to correlations between both meson-antimeson systems. I exemplify this correlation in a detailed numerical study (which also includes b->s gamma and Kaon CP violation) for a scenario with flavour-changing left-left elements of the squark mass matrix. I further have a critical look at D mixing.

Speaker: Mr Momchil Davidkov (Institute for Theoretical Particle Physics, Karlsruhe Institute of Technology)

Slides Vortrag-Davidkov-SUSY10.pdf

14:34 Flavor symmetry combined with spontaneous CP breaking to suppress CP violation

Flavor symmetry combined with spontaneous CP violation is used suppress CP violation in susy extension of the SM. We show how this works in a concrete model based on a discrete flavor group Q6. We find there is a built-in mechanism in the model to enhance the suppressed CP violation in the B meson system, and we compare our result with the resent results from D0 and CDF.

Speaker: Prof. Jisuke Kubo (Kanazawa University)

Slides susy-kubo.pdf

14:51 The Higgs as a harbinger of flavor symmetry

Discrete symmetries employed to explain flavor mixing and mass hierarchies are often associated with an enlarged scalar sector which might lead to exotic Higgs decay modes. We explore such a possibility in a scenario with S_3 flavor symmetry which requires three scalar SU(2) doublets. The spectrum is fixed by minimizing the scalar potential, and we observe that the symmetry of the model leads to tantalizing Higgs decay modes potentially observable at the CERN Large Hadron Collider (LHC).

Speaker: Philipp Leser (TU Dortmund, Germany)

Slides susy10_leser.pdf

15:08 Flavor in the Three-Site Model

We discuss the flavor symmetries of the three-site model at tree-level and beyond and consider the general bounds on flavor structure of the three-site model arising from neutral-meson mixing phenomenology, constraints on lepton flavor violation, and precision electroweak measurements.

Speaker: Tomohiro Abe (Nagoya University)

Slides susy2010_TomohiroABE.pdf

15:25 Relating quarks and leptons without unification

We propose a supersymmetric extension of the standard model based on the flavor symmetry A4. Charged fermion masses arise from renormalizable Yukawa couplings while neutrino masses are generated by the usual dimension five operator. We show that by a suitable choice of the soft breaking terms one can reproduce all fermion mass hierarchies, predicting a mass formula relating down quarks and charged lepton masses, and also reproduce the Cabibbo angle in the quark sector.

Speaker: Dr EDUARDO PEINADO (AHEP IFIC UNIVERSIDAD DE VALENCIA)

Slides bonn-peinado.pdf

14:00 → 15:42 Phenomenology 27-1 Chair: K. Williams

14:00 Effects of one-loop correction to the neutron beta decay within R-parity violating MSSM

Minimal Supersymmetric Standard Model with R-parity violation (RPVMSSM) contributes to the neutron beta decay via Scalar, Pseudoscalar and CP-odd vector, axial vector interactions which are absent in the Standard Model. We discuss the contribution of the RPVMSSM to the angular correlations of the neutron beta decay at the one-loop level.

Speaker: Mr Nodoka YAMANAKA (Department of Physics, Osaka University)

Slides 2010.08.27_yamanaka.pdf

14:17 NLO-QCD bottom corrections to Higgs boson production in the MSSM

We present a calculation of the two-loop bottom-sbottom-gluino contributions to Higgs boson production via gluon fusion in the MSSM. The calculation is based on an asymptotic expansion in the masses of the supersymmetric particles, which are assumed to be much heavier than the bottom quark and the Higgs bosons. We obtain explicit analytic results that allow for a straightforward identification of the dominant contributions in the NLO bottom corrections. We emphasize the interplay between the calculations of the mass and the production cross section of the Higgs bosons, discussing sensible choices of renormalization scheme for the parameters in the bottom/sbottom sector.

Speaker: Prof. Giuseppe Degrassi (Università di Roma Tre, INFN Roma Tre)

Slides Bonn.ppt

14:34 Supersymmetric Higgs Yukawa Couplings to Bottom Quarks at NNLO

The effective bottom Yukawa couplings are analyzed for the minimal supersymmetric extension of the Standard Model at two-loop accuracy within SUSY-QCD. They include the resummation of the dominant corrections for large values of tg(beta). In particular the two-loop SUSY-QCD corrections to the leading SUSY-QCD and top-induced SUSY-electroweak contributions are addressed. The residual theoretical uncertainties range at the per-cent level.

Speaker: Dr Michael Spira (Paul Scherrer Institut)

Slides spira.pdf

14:51 Electroweak contributions to squarks and gluinos production processes at the LHC

Direct Production of squarks and gluinos is one of the most important SUSY discovery channels at the LHC. After a brief review of the processes leading to the production of such particles, I will present the tree-level and next-to-leading order EW contributions. The numerical impact of these contributions in the case of squark-squark, squark--anti-squark, squark-gluino, and gluino-gluino production will be discussed.

Speaker: Dr Edoardo Mirabella (IPhT CEA Saclay)

Slides mirabella.pdf

15:08 Some results on the squark interactions with charginos/neutralinos.

We propose an effective description of squark interactions with charginos/neutralinos. We recompute the strong corrections to squark partial decay widths, and compare the full one-loop computation with the effective description. The effective description includes the effective Yukawa couplings, and another logarithmic term which encodes the supersymmetry-breaking. The proposed effective couplings reproduce correctly the radiative-corrected partial decay widths of the squark decays into charginos and neutralinos in all relevant regions of the parameter space.

Speaker: Dr Siannah Penaranda Rivas (University of Zaragoza)

Slides SUSY_2010_siannah.pdf

15:25 Electroweak supersymmetric effects in Collider Physics

We show that electroweak contributions can enhance the QCD squark pair cross section up to 50% at the LHC. We also discuss how electroweak contributions lead to rapidity gap events in squark pair production and in the end we discuss how we can obtain information on the coupling between a chargino, stop and bottom.

Speaker: Jong Soo Kim (TU Dortmund)

Slides jongsookim.pdf

15:42 → 16:12 Coffee break

16:12 → 18:12 Astro 27-2 Chair: M. Drees

16:12 Indirect Dark Matter Searches in the Light of FERMI and PAMELA

The new FERMI data on the diffuse Galactic gamma rays shows a large unidentifiedcomponent. The compatibility with a dark matter annihilation (DMA) contribution has been investigated. Furthermore, the data is compared with extremely precise new data on the outer rotation curve from maser interferometry and gasflaring. Both measurements indicate a ring of dark matter in the outer Galaxy in agreement with the hypothesis of the tidal disruption of the Canis Major dwarf Galaxy. Also the FERMI data is consistent with this hypothesis. The antiproton data from PAMELA is compared with different propagation models. It is shown that as much as half of the antiprotons may originate from DMA.

Speaker: Prof. Wim de Boer (University of Karlsruhe, KIT)

Slides de_boer-SUSY_2010_short2.pdf

16:29 Decaying LSP in SO(10) GUT and PAMELA's cosmic positrons

The thermally produced LSP has long believed to be the best candidate for dark matter in the Universe. However, recently reported PAMELA/Fermi's observations on high energy cosmic positrons' excess seem to require a new dark matter theory. It will be pointed out that they do not necessarily imply the presence of a new dark matter theory, and discussed how PAMELA/Fermi data can be explained, keeping the conventional scenario of dark matter.

Speaker: Prof. Bumseok Kyae (Pusan National University)

Slides susy10KYAE.pdf

16:46 υMSSM+3 singlets+1 gauge field: A model for inflation, neutrino mass and mu-problem solution.

I look at the MSSM augmented by righthanded neutrinos and 3 new singlets. In addition a new U(1) gauge symmetry, with a Fayet-Iliopoulos term, under which two of the singlets are (oppositely) charged is added. Rather than breaking supersymmetry, the F-I term will be balanced by a MSSM flat direction vacuum expectation value during inflation. Thus ”all MSSM fields vanishes” is not a minimum, even at tree order. Loop corrections break the huge degeneracy between flat directions. We have Anomaly Mediated Supersymmetry Breaking and cosmic strings. The model contains an inflaton candidate, an elimination of the mu-problem, and a neutrino mass generating mechanism.

Speaker: Dr Anders Basboll (University of Sussex)

Slides AndersBasbollSUSYBONN2010.pdf

17:03 Cosmic positron and antiproton constraints on the gauge-Higgs Dark Matter

We calculate the cosmic ray positron and antiproton spectra of a gauge-Higgs dark matter candidate in a recently proposed warped five-dimensional SO(5) xU(1) gauge-Higgs unification model. The stability of the gauge-Higgs boson is guaranteed by the H parity under which only the Higgs boson is odd at low energy. The 4-point vertices of HHWW and HHZZ, allowed by H parity conservation, have the same magnitude as in the standard model, which yields efficient annihilation rate for $m_H > m_W$. The most dominant annihilation channel is $H H \to W^+ W^-$ followed by the subsequent decays of the $W$ bosons into positrons or quarks, which undergo fragmentation into antiproton. Comparing with the observed positron and antiproton spectra with the PAMALA and Fermi/LAT, we found that the Higgs boson mass cannot be larger than 90 GeV, in order not to overrun the observations. Together with the constraint on not overclosing the Universe, the valid range of the dark matter mass is restricted to 70-90 GeV.

Speaker: Prof. Kingman Cheung (Konkuk University/national Tsing Hua U.)

Slides kingman-cheung.pdf

17:20 Inert Neutralino Dark Matter in the E6SSM

The E6SSM is an E6 GUT group inspired supersymmetric model. The low energy theory contains an extra U(1) gauge group and a standard model singlet that is only charged under this extra U(1). The LSP dark matter candidate typically comes from a new and approximately decoupled sector containing two inert extra generations of Higgsinos and singlinos, where inert means that their scalar superpartners do not get VEVs. This naturally light neutralino LSP can account for the observed cold dark matter relic density, somewhat independently of the rest of the model, provided that tan(beta) is less than about 2 and that various Yukawa couplings in the new inert sector satisfy certain conditions. After an introduction to these results these conditions are analysed in the context of a GUT constrained version of the model and some phenomenological implications of the inert sector of this model are briefly discussed.

Speaker: Mr Jonathan Hall (University of Southampton)

Slides hall.pdf

17:37 Astrophysical Susy The High Energy Density Frontier

If broken susy is discovered at Fermilab or the LHC it may become more pressing to study the possibility of an exact susy phase to which an enhanced transition probability could arise in dense matter. In collaboration with Peter Biermann several astrophysical anomalies are addressed which could be attributed to this phase. Among these are the gap in the black hole mass distribution, the stalling out of supernovae in the standard model, the dearth of cold white dwarfs, and the surprising new indication that supernovae 1a cannot be adequately ascribed to accretion in binary systems

Speaker: Prof. Louis Clavelli (University of Alabama)

Slides ClavelliSusy10b.pdf

16:12 → 17:54 Collider 27-2 Chair: S.Y. Choi

16:12 Search for Stopped Gluinos during Beam-off Periods at CMS

We report the preliminary results of a search for long-lived particles produced in 7 TeV pp collisions from CERN’s Large Hadron Collider. We have looked for long-lived particles which have stopped in the CMS detector. We search for the subsequent decay of these particles during time intervals where there were no pp collisions. In particular, we search for decays during gaps between crossings in the LHC beam structure as well as the inter-fill period between the beam being dumped and re-injection using a dedicated calorimeter trigger.

Speaker: Dr Fedor Ratnikov (KIT)

Slides Ratnikov_SUSY2010_2.pdf

16:46 Search for Heavy Stable Charged Particles in CMS

We report the preliminary results of a search for HSCP produced in 7 TeV pp collisions from CERN’s Large Hadron Collider. A signature-based search for heavy stable charged particles using a high transverse-momentum muon trigger was performed. The search uses time-of-flight and ionization energy loss to isolate slowly moving, heavy, high transverse momentum particles. This result is interpreted within the context of stable stop squark and gluino models.

Speaker: Dr Piotr Traczyk (CalTech)

Slides ptraczyk_susy10.pdf

17:03 MUSiC - A Model Unspecific Search In CMS

MUSiC is a tool for model independent searches in the data recorded by the CMS experiment. Such an analysis can help to understand the detector and later to discover new physics by systematically scanning the data for deviations from the standard model expectations. Sensitivity to a wide range of models for new physics is achieved by minimizing the theoretical bias. Kinematic distributions, expected to be sensitive to detector effects and new physics are compared, after sorting the events into classes defined by their particle content (leptons, photons, jets and missing transverse energy). Systematic uncertainties are taken into account rigorously in advanced statistical methods, which are used to determine the significance of the deviating regions. The current status of this analysis and the state and performance of the CMS experiment in light of this analysis is shown.

Speaker: Holger Pieta (RWTH Aachen University; Institute III A)

Slides MUSiC-Pieta.pdf

17:20 Searches for semi-stable massive particles stopping in the ATLAS calorimeter

If a model such as split-SUSY is realized in nature, R-hadrons, which contain a long-lived gluino or squark, can be produced and detected by the ATLAS experiments at the CERN Large Hadron Collider. These particles will traverse the detector and may lose enough of their energy through ionization to become captured and stop in the densest materials. Such "stopped" particles would decay at some later time, producing a high energy deposit which can be picked up by the trigger and detector, provided they remain active. This presentation discusses the detailed detector simulation, trigger strategy and analysis methods for detecting these stopped long-lived particles in ATLAS. We present a first study of the data collected with ATLAS at 7TeV center of mass energy.

Speaker: Dr Paul Jackson (SLAC)

Slides JacksonSUSY2010_StoppedGluino.pdf

17:37 Kinematical variables towards new dynamics at the LHC

At the LHC, many new physics signatures feature the pair-production of massive particles with subsequent direct or cascading decays to weakly-interacting particles, such as SUSY scenarios with conserved R-parity or H->W(lnu)W(lnu). We present a novel set of dimension-less variables that can be used in establishing the discovery of processes of this type in conjunction with a set of variables with mass dimension that can be used to characterize these processes.

Speaker: Mr Christopher Rogan (Lauritsen Lab. for High Energy Physics)

Slides Rogan_SUSY2010_MR.pdf

16:12 → 17:54 Model Building 27-2 Chair: A. Brignole

16:12 Phenomenology of Resolving Orbifold

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Speaker: Mr Michael Blaszczyk (University Bonn)

Paper blaszczyk_susy2010.pdf

16:29 Constraints on the split-UED mass spectrum from flavor violation

In models with universal extra dimensions, all Standard Model particles are promoted to five dimensional fields which extend into a flat extra dimension S^1/Z_2. The inclusion of extra dimensional fermion mass terms splits the mass of the Kaluza-Klein fermion modes from Kaluza-Klein masses of the gauge bosons and the Higgs which has important implications for the collider- and the dark matter phenomenology of these so-called split-UED models. In this talk we point out, that generic choices for the five dimensional mass terms lead to flavor changing neutral currents already at tree level. We use the constraints on FCNCs in order to determine experimentally viable 5D fermion mass terms which in turn determine the fermion Kaluza-Klein spectrum. We show that the absence of FCNCs implies that the Kaluza-Klein mode masses of quarks of different flavors must be highly degenerate.

Speaker: Dr Thomas Flacke (Universitaet Wuerzburg, Germany)

Slides FlackeDieter.pdf

16:46 Universal Extra Dimensions on (Projective) Sphere

We propose a six dimensional Universal Extra Dimensions (UED) model compactified on a real projective plane $RP2$, a two-sphere with its antipodal points being identified. We utilize the Randjbar-Daemi-Salam-Strathdee spontaneous sphere compactification with a monopole configuration of an extra $U(1)_X$ gauge field that leads to a spontaneous radius stabilization. Unlike the sphere and the so-called $S2/Z_2$ compactifications, the massless $U(1)_X$ gauge boson is safely projected out. We show how a compactification on a non-orientable manifold results in a chiral four dimensional gauge theory by utilizing 6D chiral gauge and Yukawa interactions. The resultant Kaluza-Klein mass spectra are distinct from the ordinary UED models compactified on torus. We briefly comment on the anomaly cancellation and also on a possible dark matter candidate in our model.

Speaker: Dr Kin-ya Oda (Osaka University)

Slides odakin_SUSY10_v2.pdf

17:03 Moduli stabilization in gauge-Higgs unification

We discuss the modulus stabilization by the Casimir energy in a gauge-Higgs unification model in the warped spacetime. We evaluate the masses of the radion and the Higgs boson and mixing between them. We also consider effects of brane-localized kinetic and mass terms on the stabilization.

Speaker: Dr Yutaka Sakamura (KEK)

Slides SUSY10_sakamura.ppt.ppt

17:20 Stability of Scalar Fields in Warped Extra Dimensions

We show that it is possible to create an RS soft-wall model, a model with a compact extra dimension, without using fundamental branes. All that is required are bulk scalar fields minimally coupled to gravity. Of crucial importance is the stability of the size of the extra dimension. Without branes, one cannot easily implement the Goldberger-Wise mechanism, and instead it must be shown that the scalar configuration is stable in its own right. We use the superpotential apporach for generating solutions, the so called 'fake supergravity' scenario, and show that configurations generated in such a way with N scalars coupled minimally to gravity are always free of tachyonic modes. We also analyze the existence of zero modes. We present a theorem that relates the number of zero modes to the parities of the background solutions, for which we also present some examples.

Speaker: Mert Aybat (Nikhef)

Slides stability.pdf

17:37 Lepton number, black hole entropy and 10^32 copies of the SM

Lepton number violating processes are a typical problem in theories with a low quantum gravity scale. Here we examine lepton number violation in theories with a saturated black hole bound on a large number of species. Such theories have been advocated recently as a possible solution to the hierarchy problem and an explanation of the smallness of neutrino masses. Naively one would expect black holes to introduce TeV scale LNV operators, thus generating unacceptably large rates of LNV processes. We show, however, that this does not happen in this scenario due to a complicated compensation mechanism between contributions of different Majorana neutrino states to these processes. The phenomenology of such scenarios is discussed.

Speaker: Prof. Heinrich Paes (TU Dortmund)

Slides Paes-BH.pdf

16:12 → 17:54 Phenomenology 27-2 Chair: P.Slavich

16:12 Soft-gluon resummation for squark and gluino hadroproduction

We consider the resummation of soft gluon emission for squark and gluino hadroproduction at next-to-leading-logarithmic accuracy in the framework of the minimal supersymmetric standard model. We present predictions for all squark and gluino pair-production processes at the Tevatron and at the LHC. The size of the soft-gluon corrections and the reduction in the scale uncertainty are most significant for processes involving gluino production. At the LHC, where the sensitivity to squark and gluino masses ranges up to 3 TeV, the corrections due to NLL resummation over and above the NLO predictions can be as high as 35% in the case of gluino-pair production, whereas at the Tevatron, the NLL corrections are close to 40% for squark-gluino final states with sparticle masses around 500 GeV. Moreover we present predictions for the production of top and bottom squarks at the Tevatron and the LHC, including next-to-leading order corrections in supersymmetric QCD and the resummation of soft gluon emission at next-to-leading-logarithmic accuracy. We discuss the impact of the higher-order corrections on total cross sections and transverse-momentum distributions, and provide an estimate of the theoretical uncertainty due to scale variation and the parton distribution functions.

Speaker: Silja Brensing (Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen University)

Slides brensing_talk.pdf

16:29 Bound-state effects on gluino-pair production

We study bound-state effects on the pair production of gluinos at hadron colliders, in a context of the minimal supersymmetric extension of the standard model. Due to the expected large mass and the octet color-charge of gluinos, the bound-state effects can be substantial at the LHC. We find significant deformation of the invariant-mass distributions of a gluino-pair near the mass threshold, as well as an additional correction to the total cross-section.

Speaker: Dr Hiroshi Yokoya (CERN PH-TH)

Slides YOKOYA_SUSY2010_0827.pdf

16:46 Stop and Sbottom Sector Renormalization in the Complex MSSM

Various renormalization schemes are defined, analyzed analytically and tested numerically in the decays Stop2 -> Sbot_i H+/W+ (i = 1,2). No scheme is found that produces numerically acceptable results over all the cMSSM parameter space, where problems occur mostly already for real parameters. Two schemes are identified that show the most robust behavior. A numerical analysis of the four partial stop} decay widths is performed in our ``preferred'' scheme, ``m_b, A_b DRbar''. The full one-loop corrections to the corresponding partial decay widths are evaluated including hard QED and QCD radiation. We find mostly modest corrections at the one-loop level.

Speaker: Sven Heinemeyer (IFCA (CSIC, Santander))

Slides sven_stopsbot.pdf

17:03 Electroweak corrections to neutralino decays in supersymmetric models with and without R-parity

SUSY models with broken R-partiy provide an interesting alternative ansatz to explain neutrino physics, which is intrinsically supersymmetric. In most of these models one has to calculate the neutrino mass matrix at the one loop level to be consistent with current neutrino data. As the same paramters govern neutrino physics and LSP decays one obtains interesting correlations between the LSP decay properties and and neutrino mixing angles. For this purpose full electroweak corrections to the LSP decays have to be taken into account. We discuss some technical details of the electroweak corrections to the LSP decay, which can also easily be used for the decays of the heavier neutralinos in the MSSM as well as the NMSSM.

Speaker: Mr Stefan Liebler (Universität Würzburg)

Slides SUSY2010LieblerS.pdf

17:20 Probing SUSY CP phases at colliders

In the Minimal Supersymmetric Standard Model, physical phases of complex parameters lead to CP violation. We show how triple products of particle momenta or spins can be used to construct asymmetries, that allow us to probe these CP phases. We discuss the production of charginos and neutralinos at the International Linear Collider (ILC). For the Large Hadron Collider (LHC), we discuss CP asymmetries in squark decays, and in the trilepton signal. We find that the CP asymmetries can be as large as 40 %.

Speaker: Dr Olaf Kittel (University of Granada)

Slides olaf_kittel_susy10.pdf

17:37 CP Violation in meson mixing: Implications for SUSY models

As indicated by recent data from Tevatron, there might be sizable NP effects in the Bs mixing phase, S_psiphi. We discuss how large values for S_psiphi can be accommodated for in the MSSM. We emphasize that while the MFV framework is not well suited to explain potentially large effects in S_psiphi, models with large flavor changing right handed currents provide natural frameworks to account for such effects and we analyze a specific abelian flavor model where exactly this situation arises. Abelian flavor models naturally realize the alignment mechanism and thus generically predict large NP contributions to D0 - D0bar mixing. We point out that within that class of models, CP violating effects in D0 - D0bar mixing unambiguously imply a lower bound for the EDMs of hadronic systems, like the neutron EDM and the mercury EDM.

Speaker: Mr Wolfgang Altmannshofer (TU Munich)

Slides altmannshofer_SUSY10.pdf

Saturday, 28 August

09:00 → 09:30 A Review of Topics in Gauge Mediation, Z. Komargodski

Plenary talk
Chair: S. Förste

slides KomargodskitalkSUSY2010.pdf

09:35 → 10:05 Realizations of Tree Level Gauge Mediation, A. Romanino

Plenary talk
Chair: S. Förste

slides romanino.pdf

10:10 → 10:40 The Phenomenology of General Gauge Mediation, S. Abel

Plenary talk
Chair: S. Förste

slides SUSY2010-Abelv2.pdf

10:45 → 11:15 Coffee break

11:15 → 11:45 The Idea of F-theory GUTs, R. Blumenhagen

Plenary talk
Chair: H. Haber

slides Blumenhagen.pdf

11:50 → 12:20 Harmony of Scattering Amplitudes: From QCD to N=8 supergravity, Z. Bern

Plenary talk
Chair: H. Haber

slides bern-susy10.pdf

12:25 → 12:55 Prospects for Supersymmetry in the LHC Era, J. Ellis

Plenary talk
Chair: H. Haber