20-24 May 2013

Bonn

Europe/Berlin timezone

- planck2013@uni-bonn.de

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## Contribution List

Displaying 131
contributions
out of
131

Session:
Parallel Session on String Theory

The location of matter fields and the pattern of gauge symmetry in extra dimensions are crucial ingredients for string model building. We analyze realistic MSSM models from the heterotic Z6 Mini-Landscape and extract those properties that are vital for their success. We find that Higgs bosons and the top quark are not localized in extra dimensions and live in the full D=10 dimensional space-time.
... More

Presented by Paul OEHLMANN
on
22 May 2013
at
4:40 PM

I present the 5D realization of a composite Higgs model with minimal tuning. The Higgs is a (pseudo-)Goldstone boson from the spontaneous breaking of a global SO(5) symmetry to an SO(4) subgroup. The peculiarity of our construction lies in the specific choice of the SO(5) representations of the 5D fermions which reduces the tuning to the minimal model-independent value allowed by electroweak preci
... More

Presented by Andrea THAMM
on
22 May 2013
at
5:20 PM

Session:
Parallel Session on Formal BSM

Some experimental anomalies suggest the possible existence of light sterile neutrino(s) mixing with the active ones. In this talk, we present a (supersymmetric) scenario in which the sterile neutrino is the fermionic partner of the pseudo-Goldstone boson associated with the spontaneous breaking of an approximate global symmetry. This property protects the sterile neutrino mass against large contri
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Presented by Stéphane LAVIGNAC
on
21 May 2013
at
2:30 PM

Session:
Parallel Session on Formal BSM

We propose an extension of the standard model in which dark sector respects an unbroken local U(1) symmetry and communicates with standard model sector via portal interactions of Higgs, right-handed neutrinos and kinetic mixing. Various constraints and physics involved in the model are discussed.

Presented by Wan-Il PARK
on
21 May 2013
at
4:40 PM

Session:
Parallel Session on Cosmology

I present a model of baryogenesis through leptogenesis, inspired from arXiv:0804.0801, in which a lepton asymmetry is generated by the CP-violating decay of an electroweak scalar triplet. This triplet also gives rise to neutrino Majorana masses through the type II seesaw mechanism. Therefore, there is a very direct link between the CP asymmetry and neutrino parameters, which are already known or c
... More

Presented by Benoit SCHMAUCH
on
21 May 2013
at
4:20 PM

Session:
Parallel Session on Cosmology

We evaluate the modifications to the CMB anisotropy spectrum that result from a semiclassical expansion of the Wheeler–DeWitt equation for a real scalar field coupled to gravity in a spatially flat FLRW universe. Recently, such an investigation has led to the prediction that the power at large scales is suppressed. We make here a more general analysis and show that there is an ambiguity in the c
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Presented by Giampiero ESPOSITO
on
21 May 2013
at
2:00 PM

Session:
Parallel Session on Dark Matter

High-energy photons from dark matter annihilation in dark matter halos and subhalos may contribute to the diffuse gamma-ray background. We study here the features of the angular power spectrum of the signal expected from dark matter annihilation in galactic halos and subhalos. We evaluate the anisotropy signal obtained from various galactic-sized cosmological simulations and discuss the relevant p
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Presented by Valentina DE ROMERI
on
22 May 2013
at
5:20 PM

Session:
Parallel Session on BSM Physics

In light of the conspicuous absence of SUSY in the energy range explored by the LHC in 2012, non-supersymmetric BSM scenarios are becoming more and more attractive. One key ingredient in exploring such BSM physics are the renormalization group equations (RGEs) that are essential for extrapolating the theory to higher energy scales. Although the 2-loop RGEs for a general quantum field theory are kn
... More

Presented by Florian LYONNET
on
22 May 2013
at
5:20 PM

Session:
Parallel Session on Higgs Physics

We discuss how to probe Beyond Standard Model theories with Higgs coupling data. I will discuss, first, how much Higgs couplings deviate from their Standard Model values in different theories if no other states are accessible at the LHC. We will argue that this is the experimental precision required in the measurement of Higgs couplings. Finally, I will discuss how present and future Higgs couplin
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Presented by Rick Sandeepan GUPTA
on
23 May 2013
at
2:30 PM

We discuss issues surrounding the definition of CP transformations in theories with discrete flavour symmetries. We will show that the consistency of the theory implies that every generalised CP transformation can be interpreted as a representation of an automorphism of the discrete group. Using this formalism, we will discuss various approaches that try to derive CP phases from geometrical proper
... More

Presented by Martin HOLTHAUSEN
on
22 May 2013
at
4:20 PM

Session:
Parallel Session on Flavor Physics

We discuss the advantages of combining the experimental bound on Br(B_s -> mu+ mu-) and the measured Br(B -> K l+l-) to get the model independent constraints on physics beyond the Standard Model. Since the two decays give complementary information, one can study not only the absolute values of the Wilson coefficients that are zero in the Standard Model, but also their phases. We study benchmark ph
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Presented by Nejc KOSNIK
on
21 May 2013
at
2:30 PM

Session:
Parallel Session on Formal BSM

I study precision gauge coupling unification (PGU) in the MSSM with pure gravity and mixed gravity/anomaly mediation. Implications of PGU for SUSY searches at the LHC are discussed.

Presented by Martin WINKLER
on
21 May 2013
at
2:00 PM

Session:
Parallel Session on LHC and DM

Models with universal extra dimensions predict that each Standard Model particle is accompanied by a tower of Kaluza-Klein resonances. Canonical searches for the production and cascade decays of first Kaluza-Klein modes through missing transverse momentum signatures suffer in general from low detection efficiencies because of the rather compressed Kaluza-Klein particle mass spectrum. We analyze si
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Presented by Lisa EDELHÄUSER
on
23 May 2013
at
5:40 PM

Session:
Parallel Session on Dark Matter

Decaying dark matter is an interesting and viable alternative to the common paradigm of stable dark matter. Our purpose is to investigate whether the LHC can probe scenarios of decaying DM. Although the limits on the DM lifetime forbid the direct collider observation of its decays, the couplings responsible for these processes can determine, thanks to crossing symmetries, DM production cross secti
... More

Presented by Giorgio ARCADI
on
22 May 2013
at
2:30 PM

Session:
Parallel Session on Dark Matter

Co-annihilation can be dominant in many scenarios. We adopt an effective operator approach to the dark matter physics where co-annihilation is dominant in giving the right amount of relic abundance. The related collider constraints on these effective operators are also studied.

Presented by Yi CAI
on
22 May 2013
at
5:00 PM

Session:
Parallel Session on LHC and DM

The Lyman-alpha forest bound severely constrains the non-resonant production of warm dark matter in the nuMSM. It has been shown that an extension of the nuMSM by a Higgs singlet phi can provide a dark matter production mechanism through the decays of phi that readily satisfies or escapes the Lyman-alpha bound. I will discuss the astrophysical and cosmological constraints on such models and demons
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Presented by Kyle ALLISON
on
23 May 2013
at
4:20 PM

Session:
Parallel Session on String Theory

Discrete symmetries are usually invoked to explain the absence of baryon- and lepton-number violating operators in the MSSM. In global D-brane models, discrete Z_n symmetries arise as remnants of massive Abelian gauge symmetries. I will discuss the conditions for the existence of Z_n symmetries in intersecting D-brane worlds on orbifold backgrounds. An examplary global model with particle physics
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Presented by Gabriele HONECKER
on
22 May 2013
at
2:00 PM

Session:
Parallel Session on Higgs Physics

In this talk we revisit the simplest Higgs sector extension containing an additional scalar singlet. We perform a detailed analysis of double Higgs production at the LHC, exploring in particular the bbWW channel. We also comment the relevance of the results for Higgs portal DM models.

Presented by Jesus M. MORENO
on
23 May 2013
at
2:00 PM

Session:
Parallel Session on Dark Matter

We show that there exists only a quite limited number of higher dimensional operators which can naturally lead to a slow decay of dark matter particles into monochromatic photons. As each of these operators inevitably induces decays into particles other than photons, we show that the g-lines it induces are always accompanied by a continuum flux of cosmic rays. Hence constraints on cosmic-ray fluxe
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Presented by Tiziana SCARNA
on
22 May 2013
at
4:00 PM

Session:
Parallel Session on Formal BSM

We present the formalism of computing one-loop effective action for quantum gravitation using non-local heat kernel methods. We find agreement with previous old results. In main part of my talk I consider the system of E-H gravitation and scalar fields. We are able to derive nonlocal quantum effective action up to the second order in heat kernel generalized curvatures. By going to flat spacetime e
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Presented by Leslaw RACHWAL
on
21 May 2013
at
5:40 PM

We examine the compatibility of the composite Higgs models with the constraints coming from Electroweak Precision Tests from the low-energy effective theory (EFT) prospective. The EFT approach allows us to capture the common features of the composite Higgs models and incorporate a broad class of explicit models. In our analysis we concentrate on the effects related to a presence of relatively ligh
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Presented by Oleksii MATSEDONSKYI
on
22 May 2013
at
4:40 PM

Session:
Parallel Session on Higgs Physics

The a 125 GeV Higgs boson can be most naturally realized within the MSSM if there is significant stop squark mixing. This talk deals with the difficulties in obtaining large stop mixing from high-scale SUSY breaking models. We detail the necessary conditions on the high-scale soft terms, and review several scenarios of SUSY breaking mediation with regards to their compatibility with maximal stop m
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Presented by Felix BRUEMMER
on
23 May 2013
at
3:00 PM

Session:
Parallel Session on Formal BSM

I will present ideas of how to predict fermion mixing with the help of discrete non-abelian flavor symmetries which are broken in a particular way and give examples of models in which such ideas are realized. In the leptonic sector emphasis will be put on the possibility to explain the recently measured value of the reactor mixing angle and the possibilities to predict CP violating phases.

Presented by Claudia HAGEDORN
on
23 May 2013
at
5:50 PM

Session:
Parallel Session on Formal BSM

The motivation behind flavour-messenger unification originates from some F-theory constructions of GUT theories where flavour and messengers come from the same D7-brane intersection. This means that messengers and visible matter should be treated on equal footing. This scenerio has very strong consequences on model building and low energy phenomenology.

Presented by Jacek PAWEŁCZYK
on
21 May 2013
at
4:20 PM

The observed hierarchies of fermion masses and mixing angles can be explained in the framework of Froggatt and Nielsen by imposing a family dependent U(1) symmetry. Based on a supersymmetric setting, we consider the possibility of a flavor U(1) R-symmetry which breaks down to a remnant Z4 R-symmetry. While containing R-parity as a subgroup, this discrete R-symmetry provides a solution to the mu-pr
... More

Presented by Christoph LUHN
on
22 May 2013
at
2:00 PM

Session:
Parallel Session on BSM Physics

We discuss a minimal modification of Gauge Mediation in which the messenger sector couples directly to the MSSM matter fields. These couplings are controlled by the same dynamics that explain the flavor hierarchies, and therefore are parametrically as small as the Yukawas. This setup gives rise to an interesting SUSY spectrum that is calculable in terms of a single new parameter. Due to large A-te
... More

Presented by Lorenzo CALIBBI
on
22 May 2013
at
4:00 PM

We construct a general class of pseudo-Goldstone composite Higgs models, within the minimal SO(5)/SO(4) coset structure. We characterize the main properties these models should have in order to give rise to a Higgs mass around 125 GeV. We assume the existence of relatively light and weakly coupled spin 1 and 1/2 resonances. In absence of a symmetry principle, we introduce the Minimal Higgs Potenti
... More

Presented by David MARZOCCA
on
22 May 2013
at
5:00 PM

Session:
Parallel Session on Cosmology

I will report on the first numerical 3+1D simulation of a thermal first-order phase transition. The simulation includes a scalar field plus a relativistic fluid. We follow
the evolution and collisions of the bubbles related to the phase transition. We compute the generated gravitational wave spectrum, and find that their prime source are sound
produced by the colliding bubbles.

Presented by Stephan HUBER
on
21 May 2013
at
3:00 PM

Session:
Parallel Session on Flavor Physics

It is known that heavy sterile neutrinos (HSN) of order 100 MeV can serve as an agent of the baryon asymmetry and successful supernova explosions. We explore the feasibility of detecting such HSN by the existing facilities of neutrino experiments. Taking the T2K experiment as a typical example, we find that the HSN are copiously produced at the secondary beam line and their decays taking place ins
... More

Presented by Atsushi WATANABE
on
21 May 2013
at
3:00 PM

Session:
Parallel Session on Formal BSM

As is well known, a standard heterotic compactification to a maximally symmetric space-time does not allow for fluxes to stabilise moduli. By relaxing the condition of a maximally symmetric spacetime, I show how this no-go theorem may be avoided. I will work with the example of a domain wall for concreteness. After moduli stabilisation, the domain wall vacuum may be lifted by means of e.g non-pert
... More

Presented by Eirik Eik SVANES
on
23 May 2013
at
5:10 PM

Session:
Parallel Session on LHC and DM

Performing a fit to all publicly available data, we analyze the extent to which the latest results from the LHC and Tevatron constrain the couplings of the Higgs boson-like state at ~ 125 GeV, as well as invisible (or undetected) decays. This is based on arXiv:1212.5244 (to appear in JHEP) and G. Belanger, BD, U. Ellwanger, J. F. Gunion, S. Kraml, in preparation.

Presented by Beranger DUMONT
on
23 May 2013
at
5:00 PM

Session:
Parallel Session on Higgs Physics

Extending the Higgs sector of the MSSM by triplets alleviates the little hierarchy problem and naturally allows for enhancements in the diphoton decay rate of the lightest CP-even Higgs. In this talk the Higgs phenomenology of this theory with a hyperchargeless triplet is analyzed. In particular, for any value m_A > m_h there is a parameter region where the CP-even Higgs sector appears at collider
... More

Presented by Germano NARDINI
on
23 May 2013
at
6:10 PM

Session:
Parallel Session on LHC and DM

General Composite Higgs models provide an elegant solution to the hierarchy problem present in the Standard Model (SM) and give an alternative pattern leading to the mechanism of electroweak symmetry breaking (EWSB). We present a recently proposed realistic realization of this general idea analyzing in detail the Higgs production and decay modes. Comparing them with the latest Large Hadron Collide
... More

Presented by Daniele BARDUCCI
on
23 May 2013
at
5:20 PM

Session:
Parallel Session on Higgs Physics

After an introduction on the current experimental status of the Higgs boson, I will study the effect of new vector-like fermions on the h -> gamma gamma channels, in which the effect of new physics may be already showing up. In particular, I will analyze colored and uncolored fermions in their smallest SU(2) representations, and the modifications to the previously mentioned channels in regions all
... More

Presented by Enrico BERTUZZO
on
23 May 2013
at
5:30 PM

Session:
Parallel Session on Cosmology

The Higgs-Dilaton cosmological model describes simultaneously an inflationary period in the early Universe and a dark energy dominated stage responsible for the present day acceleration. The common origin of both processes gives rise to a non-trivial relation between the spectral tilt of scalar perturbations and the dark energy equation of state. We study the self-consistency of this model from an
... More

Presented by Javier RUBIO
on
21 May 2013
at
5:00 PM

Session:
Parallel Session on LHC

We analyze the impact of effective axial-vector coupling of the gluon on spin polarization observables in $t\bar{t}$ pair production at the LHC (arXiv:1212.3272, to appear on PRD). Working at leading order in QCD, we compute the $t\bar{t}$ spin-correlation and left-right spin asymmetry coefficients in the helicity basis in the laboratory frame as functions of the new physics scale $\Lambda$ associ
... More

Presented by Antonio RACIOPPI
on
21 May 2013
at
4:20 PM

Session:
Parallel Session on String Theory

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Presented by Francisco PEDRO
on
22 May 2013
at
4:00 PM

Session:
Parallel Session on Dark Matter

Over the last years direct dark matter detection, collider searches and gamma ray observations have made tremendous progress towards probing dark matter. In particular searches for gamma ray lines have attracted a lot of attention during the last year. A well known alternative to gamma lines is provided by the hard spectrum of Internal Bremsstrahlung. We investigate the importance of direct detect
... More

Presented by Stefan VOGL
on
22 May 2013
at
4:20 PM

Session:
Parallel Session on LHC and DM

We explore the interplay between lines in the gamma-ray spectrum and LHC searches involving missing energy and photons. As an example, we consider a singlet Dirac fermion dark matter with the mediator for Fermi gamma-ray line at 130 GeV. A new chiral or local U(1) symmetry makes weak-scale dark matter natural and provides the axion or Z' gauge boson as the mediator connecting between dark matter a
... More

Presented by Hyun Min LEE
on
23 May 2013
at
6:30 PM

Session:
Parallel Session on Flavor Physics

The recent discovery of a non-zero value of the mixing angle theta_13 has ruled out tri-bimaximal mixing as the correct lepton mixing pattern generated by some discrete flavor symmetry (barring large next-to-leading order corrections in concrete models). In this work we assume that neutrinos are Majorana particles and perform a general scan of all finite discrete groups with order less than 1536 t
... More

Presented by Kher Sham LIM
on
21 May 2013
at
4:40 PM

Session:
Parallel Session on LHC

I will discuss the 8 TeV LHC reach on pair produced heavy flavored di-jet resonances. Motivated by theories of R-parity violation in supersymmetry I will concentrate on a final state with two b-jets and two light jets. I will exploit b-tagging to reject the background and discuss its importance at the trigger level to probe light stops. I will also present kinematical selections that can be used t
... More

Presented by Riccardo TORRE
on
21 May 2013
at
2:00 PM

Session:
Parallel Session on BSM Physics

In SUSY SO(10) GUT the top, bottom and tau Yukawa couplings unify at the GUT scale. It is shown that in a MSSM scenario restricted by top-bottom-tau Yukawa unification and the SO(10) gauge symmetry the low-energy SUSY spectrum may consist of the 125 GeV Higgs and light, strongly-mixed staus leading to enhanced Higgs diphoton rate.

Presented by Marcin BADZIAK
on
22 May 2013
at
3:00 PM

Session:
Parallel Session on LHC

Recent ATLAS and CMS measurements show a slight excess in the WW cross section measurement. While still consistent with the Standard Model within 1-2 sigma, the excess could be also a first hint of physics beyond the Standard Model. We argue that this effect could be attributed to the production of scalar top quarks within supersymmetric models. The stops of mass ~200 GeV has the right cross secti
... More

Presented by Krzysztof ROLBIECKI
on
21 May 2013
at
2:30 PM

Session:
Parallel Session on BSM Physics

I discuss two possible extensions to the standard model in which an inert singlet scalar state that only interacts with the Higgs boson is added together with some fermions. In one model the fermions provide for a see-saw mechanism for the neutrino masses, in the other model for grand unification of the gauge couplings. Masses and interaction strengths are fixed by the requirement of controlling t
... More

Presented by Marco FABBRICHESI
on
22 May 2013
at
5:00 PM

Session:
Parallel Session on Formal BSM

Scenarios in which the supersymmetry breaking scale is not far above the soft parameters of the Minimal Supersymmetric Standard Model (MSSM) have two main consequences for model building. First, the particle spectrum is extended by an almost massless gravitino and possibly a sgoldstino scalar. Second, the MSSM interactions receive significant corrections from higher dimensional effective operators
... More

Presented by Pantelis TZIVELOGLOU
on
21 May 2013
at
4:00 PM

Session:
Parallel Session on Formal BSM

Recent discovery of Higgs-like particle at the LHC points to modifications of standard gauge mediation models. Those which have attracted the most attention contain additional interactions between messengers and matter. During the talk I will discuss the role of such messenger-matter couplings and give examples of low-energy spectra in that class of models.

Presented by Tomasz JELINSKI
on
21 May 2013
at
5:20 PM

Session:
Parallel Session on Flavor Physics

We discuss extensions of the Standard Model with two Higgs doublets, where there are flavour changing neutral currents both in the quark and leptonic sectors, with their strength controlled by the fermion mixing matrices $V_{CKM}$ and $V_{PMNS}$. These models are an extension to the leptonic sector of the class of models previously considered by Branco, Grimus and Lavoura, for the quark sector. Th
... More

Presented by Margarida Nesbitt REBELO
on
21 May 2013
at
2:00 PM

Session:
Parallel Session on BSM Physics

We revisit the minimal supersymmetric SU(5) grand unified theory (SUSY SU(5) GUT) in the high-scale SUSY scenario. Although the model has been believed to be excluded due to the too short lifetime of proton, we have found that it is possible to evade the experimental constraints on the proton decay rate if the supersymmetric particles have masses much heavier than the electroweak scale. Since th
... More

Presented by Natsumi NAGATA
on
22 May 2013
at
4:20 PM

Session:
Parallel Session on Higgs Physics

Nature seems to have chosen a light scalar to unitarize WW scattering. Yet, the Higgs discovery at the LHC does not fully resolve the electroweak symmetry breaking puzzle and one is left to find out what renders the light scalar naturally insensitive to (unknown) very short distance dynamics. New Physics models where the Higgs emerges as a Goldstone boson of some new strong dynamics at the TeV sca
... More

Presented by Cedric DELAUNAY
on
23 May 2013
at
4:30 PM

Session:
Parallel Session on String Theory

In the context of type IIB orientifold compactifications, we present a new class of Kaehler moduli inflation realized in the LARGE volume scenarios. The inflaton is a Kaehler modulus corresponding to the volume of a so-called "Wilson" divisor which is relevant for supporting the poly-instanton corrections. Further, this standard single-field model is generalized into a two-field model by the inclu
... More

Presented by Pramod SHUKLA
on
22 May 2013
at
4:20 PM

Session:
Parallel Session on Higgs Physics

If the electroweak symmetry breaking is originated from a strongly coupled sector, as for instance in composite Higgs models, the Higgs boson couplings can deviate from their Standard Model values. In such cases, at suficiently high energies there could occur an onset of multiple Higgs boson and longitudinally polarised electroweak gauge boson (VL) production. We study the sensitivity to anomalou
... More

Presented by Alexandra OLIVEIRA
on
23 May 2013
at
5:10 PM

Session:
Parallel Session on Flavor Physics

The talk will be based on the paper arXiv:1209.2679, in which is computed the μ → e conversion in the type-I seesaw model, as a function of the right-handed neutrino mixings and masses. The definite predictions will be presented and discussed. In particular, the ratios between the μ → e conversion rate for a given nucleus and the rate of two other processes which also involve a μ − e flav
... More

Presented by Mikael DHEN
on
21 May 2013
at
5:00 PM

I am going to present a SUSY flavor model based on a global SU(2) and a gauged U(1) horizontal symmetry. In the fermion sector it closely resembles the successful predictions of the U(2) models for various relations between fermion masses and mixing angles. In the sfermion sector the U(1) acquires a large D-term vev which together with the usual F-term contribution leads to split spectrum in which
... More

Presented by Robert ZIEGLER
on
22 May 2013
at
2:30 PM

Session:
Parallel Session on LHC and DM

We (P. Grothaus, M. Lindner, Y. T.) investigate neutralino dark matter in the low-energy phenomenological minimal supersymmetric standard model taking account of the newest results from the Large Hadron Collider as well as all other experimental bounds from collider physics and the cosmological abundance. We find that near updates of direct searches signicantly rule out a large area of the parame
... More

Presented by Yasutaka TAKANISHI
on
23 May 2013
at
4:00 PM

If the d=5 Weinberg operator is forbidden by a discrete symmetry, neutrino mass can be generated by new physics at the TeV scale, which can be tested at the LHC. We want to discuss models where neutrino mass originates from a d=7 operator in the framework of SUSY-GUTs containing an SU(5) subgroup. The embedding in GUT multiplets has phenomenological consequences, which we want to discuss on the ba
... More

Presented by Martin KRAUSS
on
22 May 2013
at
4:00 PM

Session:
Parallel Session on String Theory

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Presented by George LEONTARIS
on
22 May 2013
at
2:30 PM

Session:
Parallel Session on Flavor Physics

Recently the last of the neutrino mixing angle $\theta_{13}$ has been measured giving a non zero value. Using discrete symmetries to successfully explain lepton mixing is still possible. As an example, we have modified the so called Babu-Ma-Valle model in such a way that we account for the current neutrino mixing values at 3 $\sigma$.

Presented by David VANEGAS FORERO
on
21 May 2013
at
4:00 PM

Session:
Parallel Session on LHC and DM

Dark Matter (DM) may have been produced out of thermal equilibrium in the early universe. This possibility has been investigated before through the so-called "Freeze-in" scenario of Feebly-Interacting-Massive-Particles. In this talk I show that this is just a particular case of a general out-of-equilibrium-generated DM, by describing new alternatives which are totally different at a fundamental le
... More

Presented by Bryan ZALDIVAR
on
23 May 2013
at
6:00 PM

Session:
Parallel Session on Cosmology

Recent LHC results suggest the electroweak vacuum metastability. Although its lifetime is longer than the cosmic age in almost all the parameter space, quantum tunneling to the unwanted true vacuum in the quasi-de Sitter background may occur during inflation. This, in turn, constrains severely high-scale inflation models. In this talk, we discuss how to avoid such tunneling during high-scale infla
... More

Presented by Kohei KAMADA
on
21 May 2013
at
5:20 PM

Session:
Parallel Session on Cosmology

I give a brief overview of a recently proposed mechanism dubbed WIMPy baryogenesis. A stable Weakly Interacting Massive Particle (WIMP) is the Dark Matter (DM) candidate. Via CP-violating annihilations of the WIMP into a quark and an exotic heavy antiquark, one gets not only the right DM thermal relic abundance but also generates the observed baryon asymmetry. I discuss the key ingredients of the
... More

Presented by Lorenzo UBALDI
on
21 May 2013
at
5:40 PM

Session:
Parallel Session on Formal BSM

Dark radiation is produced in LARGE volume models in which reheating is driven by the volume modulus decaying to the visible sector. Decays of this modulus to its axion partner provide the dark radiation. I will discuss the effects of one-loop radiative corrections to the only competitive MSSM decay channel: the decay into Higgs pairs via the Giudice-Masiero term. This alone will more precisely de
... More

Presented by Stephen ANGUS
on
23 May 2013
at
4:50 PM

Session:
Parallel Session on Formal BSM

The discovery of the Higgs candidate boson last year offers a new tool to investigate BSM physics. Models with warped extra dimensions involve an additional scalar, the radion, which can mix with the Higgs. This mixing has been previously considered for Higgses localised on the infrared brane. We extend these studies to two further classes of models: those with a bulk Higgs, and gauge-Higgs unific
... More

Presented by Andrew SPRAY
on
21 May 2013
at
5:00 PM

Session:
Parallel Session on LHC

The energies attained by cosmic rays offer an opportunity for probing the mechanism for dynamical electroweak symmetry breaking directly. In this talk we will discuss which signals are expected to be observed in air showers in the presence of such mechanisms.

Presented by Dennis D. DIETRICH
on
21 May 2013
at
5:40 PM

Session:
Parallel Session on Higgs Physics

We propose a simultaneous collider search strategy for a pair of scalar bosons in the NMSSM through the decays of a very light pseudoscalar. The massive scalar has a mass around 126 GeV while the lighter one can have a mass in the vicinity of 98 GeV, thus explaining an apparent LEP excess, or be much lighter. The successive decay of this scalar pair into two light pseudoscalars, followed by lepton
... More

Presented by Chan Beom PARK
on
23 May 2013
at
5:50 PM

Session:
Parallel Session on Formal BSM

An appealing proposition to explain the suppression of proton decay mediating and other operators, in heterotic string derived models, is the existence of a low scale $Z^\prime$ that forbids the undesired operators, and thus may arise only after $Z^\prime$ breaking. We will discuss the constraints on such a $Z^\prime$ arising in string derived models and focus on the constraints arising from gauge
... More

Presented by Viraf MEHTA
on
23 May 2013
at
5:30 PM

Session:
Parallel Session on String Theory

We consider the string theory origin of R-charge conservation laws in heterotic orbifold compactifications, deriving the corresponding string coupling selection rule for factorizable and non-factorizable orbifolds, with prime ordered and non-prime ordered point groups. R-charge conservation arises due to symmetries among the worldsheet instantons that can mediate the couplings. Among our results i
... More

Presented by Damian Kaloni MAYORGA PENA
on
22 May 2013
at
5:20 PM

Session:
Parallel Session on Cosmology

We explain how non-equilibrium methods give rise to NLO corrections to the theory of unflavoured Leptogenesis in the strong washout regime. New LO predictions are made available in the weak washout case (including Leptogenesis from mixing light sterile neutrinos) and for the transition between the flavoured and unflavoured regimes. As a new source of CP-violation, we identify the mixing of active
... More

Presented by Björn GARBRECHT
on
21 May 2013
at
2:30 PM

Session:
Parallel Session on Flavor Physics

It has been pointed out that supersymmetric extensions of the Standard Model can induce significant changes to the theoretical prediction of the ratio Γ(K→eν)/Γ(K→μν)=RK, through lepton flavor violating couplings. We shall discuss these new contributions to RK arising in the context of different constrained supersymmetric models which succeed in accounting for neutrino data, further consi
... More

Presented by Renato FONSECA
on
21 May 2013
at
5:20 PM

Session:
Parallel Session on BSM Physics

In terms of physics results, 2012 has been an exciting year. In July 2012, the ATLAS and CMS collaborations have discovered a new particle that is consistent with the Standard Model Higgs boson. At the same time, the LHC has pushed the lower limits for supersymmetric particles to new heights, and this has contributed to the anxiety in the physics community that SUSY, if realized in nature, may not
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Presented by Akin WINGERTER
on
22 May 2013
at
2:30 PM

Session:
Parallel Session on Flavor Physics

What are the conditions, a minimal phenomenologically viable supersymmetric grand unified theory should fulfill? Here, we address the possibility of unification of eigenvalues of down-quark and lepton Yukawa matrices in the framework of renormalizable MSSM. Results will be presented together with a discussion of current values of relevant low-energy observables. This will present an update to prev
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Presented by Mateusz ISKRZYŃSKI
on
21 May 2013
at
5:40 PM

Session:
Parallel Session on LHC and DM

We have computed the one-loop SUSY-QCD corrections for neutralino-stop coannihilation into electroweak gauge and Higgs bosons in the MSSM. I will show that these annihilation channels are phenomenologically relevant within the pMSSM, in particular in the light of the observation of the Higgs boson with a mass of about 126 GeV at the LHC. I will show numerical results for the cross sections and the
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Presented by Quentin LE BOULC'H
on
23 May 2013
at
4:40 PM

Session:
Parallel Session on Formal BSM

Supersymmetry breaking and its mediation can be reformulated as a scattering problem. This talk will outline how pion scattering and "bottom up" AdS/QCD models may be extended to describe strongly coupled hidden sectors that break supersymmetry. We look at what can "in-principle" be measured and what it can actually predict about the MSSM.

Presented by Moritz MCGARRIE
on
23 May 2013
at
3:00 PM

Session:
Parallel Session on LHC

This talk will focus on the consequences of electroweak symmetry breaking by strong dynamics, assuming the existence of a light composite scalar appearing as a pseudo- Goldstone boson of some global symmetry of the new strongly interacting sector. In such a scenario, the composite scalar has properties very similar to the Standard Model Higgs, but the existence of additional resonances with differ
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Presented by Anna KAMINSKA
on
21 May 2013
at
4:00 PM

We revisit a two right-handed neutrino model with two texture zeros, namely an indirect model based on A4 with the recently proposed new type of constrained sequential dominance (CSD2), involving vacuum alignments along the (0,1,-1)^T and (1,0,2)^T directions in flavour space, which are proportional to the neutrino Dirac mass matrix columns. In this paper we construct a renormalizable and unified
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Presented by Martin SPINRATH
on
22 May 2013
at
3:00 PM

Session:
Parallel Session on Cosmology

We do a random scan over the parameter space of the two-Higgs-doublet model searching for points with a strong phase transition. The results show that the model is a robust candidate for explaining baryogenesis, especially in the light of the recent results by ATLAS and CMS regarding the properties of the recently discovered scalar.

Presented by Glauber CARVALHO DORSCH
on
21 May 2013
at
4:00 PM

Session:
Parallel Session on Dark Matter

We show evidence for the existence of internal bremsstrahlung signatures in the Inert Doublet Model (IDM). In particular, we show they naturally arise in the high dark matter mass regime due to the near-degeneracy of the extra scalar masses. We calculate the corresponding annihilation cross-sections and compare them against constraints coming from direct and indirect dark matter searches. Finally
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Presented by Camilo A GARCIA CELY
on
22 May 2013
at
4:40 PM

Session:
Parallel Session on LHC

Finding signs of new physics and even knowing the underlying theory does not automatically come along with the knowledge of the model parameters. In most new physics theories the relation mapping the measured observables onto the model parameters is unknown. In this talk the ability of a neural network is demonstrated to find this unknown relation in parameter space. As example different reference
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Presented by Nicki BORNHAUSER
on
21 May 2013
at
5:20 PM

Session:
Parallel Session on Formal BSM

We construct supersymmetric $SO(10)$ models with different intermediate scales, consistent with gauge coupling unification. We found the complete list of sets of fields that can be added in each regime that allows to preserve unification and a "sliding scale mechanism". Using mSugra boundary conditions we calculate some particular combinations of soft SUSY breaking terms, called "invariants", that
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Presented by Carolina ARBELÁEZ
on
23 May 2013
at
4:30 PM

Session:
Parallel Session on BSM Physics

The recent LHC discovery of a Higgs-like particle that could be involved in electroweak symmetry breaking places strong bounds on the parameter space of supersymmetric models. In particular, it has been argued that minimal gauge mediated supersymmetry breaking scenarios seem to be at odds with a Higgs boson of ~126 GeV. Supersymmetric quiver gauge theories are an already well-established attractiv
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Presented by Andreas GOUDELIS
on
22 May 2013
at
4:40 PM

Session:
Parallel Session on Dark Matter

An analysis of the Fermi gamma ray space telescope data has recently revealed a resolved gamma-ray feature close to the galactic center which is consistent with monochromatic photons at an energy of about 130 GeV. If interpreted in terms of dark matter (DM) annihilating into \gamma \gamma, this would correspond to a DM particle mass of roughly 130 GeV. The rate for these loop-suppressed processes,
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Presented by Masaki ASANO
on
22 May 2013
at
3:00 PM

Session:
Parallel Session on Higgs Physics

The basis of CP-even chiral effective operators describing a dynamical Higgs sector, is generalized to the case in which the Higgs-like particle is light. Gauge a nd gauge-Higgs operators are considered up to mass dimension five. This analysis completes the tool needed to explore at leading order the connection between linear realizations of the electroweak symmetry breaking mechanism - whose extr
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Presented by Juan Alberto YEPES
on
23 May 2013
at
4:50 PM

Session:
Parallel Session on Formal BSM

The Higgs quartic coupling has now been indirectly measured at the electroweak scale. Assuming no new low-scale physics, its running is known and, together with gauge and Yukawa couplings, it is a crucial new piece of information constraining UV completions of the Standard Model. In particular, supersymmetry broken at an intermediate or high energy scale with low tan(beta) is consistent with prese
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Presented by Alexander KNOCHEL
on
23 May 2013
at
2:30 PM

Session:
Parallel Session on LHC

The discovery of the Higgs boson at 126 GeV seems to imply masses in the multi-TeV regime for the simplest constrained SUSY models. Such a heavy supersymmetric spectrum is somewhat at odds with the naturalness criterion. Moreover, in such a framework it is impossible to obtain the correct value of $(g-2)_\mu$. By construction, SUSY models with light sleptons and light third generation squarks do n
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Presented by Enrico Maria SESSOLO
on
21 May 2013
at
4:40 PM

Session:
Parallel Session on Formal BSM

We study the phenomenological viablility of a constrained NMSSM with parameters subject to unified conditions from F-theory GUTs. We find that very simple assumptions about modulus dominance SUSY breaking in F-theory unification lead to a predictive set of boundary conditions , consistent with all phenomenological constraints.

Presented by Luis APARICIO
on
23 May 2013
at
2:00 PM

Session:
Parallel Session on BSM Physics

The recent LHC discovery of a Higgs-like resonance at 126 GeV suggests that the minimal supersymmetric standard model must be modified in order to preserve naturalness. A simple extension is to include a singlet superfield and consider the scale-invariant NMSSM, whose renormalizable superpotential contains no dimensionful parameters. This extension not only solves the \mu-problem, but can easily a
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Presented by Michael SCHMIDT
on
22 May 2013
at
2:00 PM

Session:
Parallel Session on String Theory

We give an alternative description of the Schoen manifold as the blow-up of a Z_2 × Z_2 orbifold in which one Z_2 factor acts as a roto-translation. Since for this orbifold the fixed tori are only identified in pairs but not orbifolded, four-dimensional chirality can never be obtained using standard techniques alone. This situation is typical for orbifolds that have vanishing Euler number. Howeve
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Presented by Stefan GROOT NIBBELINK
on
22 May 2013
at
3:00 PM

Session:
Parallel Session on Formal BSM

The Goldstone theorem does not apply straightforwardly to the case of spontaneously broken spacetime symmetries such as dilatation invariance. We elucidate under which conditions a light scalar degree of freedom, identifiable with the dilaton, can naturally arise in a field theory. Our construction can be considered as an example of an explicit dynamical solution to the Cosmological Constant probl
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Presented by Paolo LODONE
on
21 May 2013
at
3:00 PM

Session:
Parallel Session on LHC

Natural composite Higgs models predict light top and bottom partners, vector-like quarks that mix strongly with the top and bottom quarks. We describe the strategy to discover them and the Large Hadron Collider and their use to explore further aspects of models of strong electroweak symmetry breaking.

Presented by Jose SANTIAGO
on
21 May 2013
at
3:00 PM

Session:
Parallel Session on Cosmology

We discuss recent progress on supersymmetric tribrid inflation, a variant of hybrid inflation which is particularly suited for connecting inflation with particle physics. Inflation ends with a phase transition near the GUT scale, and the inflaton can be a D-flat combination of charged fields in the matter sector of the particle theory. This relates the inflaton couplings -- which can be constraine
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Presented by David NOLDE
on
21 May 2013
at
4:40 PM

Session:
Parallel Session on LHC and DM

The discovery of the Higgs boson at 126 GeV seems to imply masses in the multi-TeV regime for the simplest constrained SUSY models. Thus, with the exception of limited regions of the parameter space where stop mixing is large, in these scenarios the new physics might be out of reach even for the 14 TeV run. We discuss the prospects of using two alternative and complementary ways to explore the hig
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Presented by Kamila KOWALSKA
on
23 May 2013
at
7:00 PM

Session:
Parallel Session on Flavor Physics

The ultraviolet completion of flavour models can strongly improve the predictivity of the respective effective models. We consider A4 models, existing minimal UV completions and construct several next-to-minimal UV complete models. We compare the results of these possibilities to the experimental data including theta13. Through the predictive power of the UV completions, we are able to either rule
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Presented by Ivo DE MEDEIROS VARZIELAS
on
21 May 2013
at
4:20 PM

Session:
Parallel Session on LHC

If supersymmetry is the solution to the Higgs mass hierarchy problem, this requires the existence of light stops and sbottoms. The current reach of the experimental searches for stops and sbottoms at the LHC is however still limited. In this work, we exploit the information about top polarization in sbottom (and stop) decays into tops, in order to gain better control over the signals arising from
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Presented by Suchita KULKARNI
on
21 May 2013
at
5:00 PM

Session:
Parallel Session on String Theory

A PdV term is introduced into the first law of black hole thermodynamics, with the volume being defined to be the variable thermodynamically conjugate to the pressure that arises from the cosmological constant. The black hole equation of state then bears a remarkable similarity to the van der Waals equation. The effect of this new term in the equation of state will be explored.

Presented by Brian DOLAN
on
22 May 2013
at
5:00 PM

Session:
Parallel Session on Dark Matter

In this talk, an introduction to keV sterile neutrinos as Dark Matter particles is given. After reviewing the cosmological aspects of (Warm) Dark Matter, I will explain why the topic is interesting for particle physics model building and also point out the differences to ordinary neutrino model building. We will go through a couple of generic models, all of which yield interesting and fundamental
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Presented by Alexander MERLE
on
22 May 2013
at
2:00 PM