# Particle Cosmology after Planck

23-26 September 2014
DESY Hamburg
Europe/Berlin timezone
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# Particle Phenomenology

## Place

Location: DESY Hamburg
Room: Seminar room 2
Date: from 24 Sep 14:00 to 25 Sep 17:30

## Timetable | Contribution List

Displaying 21 contributions out of 21
We show that the decay of the inflaton field may be incomplete, while nevertheless successfully reheating the universe and leaving a stable remnant that accounts for the present dark matter abundance. We note, in particular, that the inflaton field alternately increases and reduces the mass of its decay products as it oscillates about the minimum of its potential. By considering an appropriate dis ... More
Presented by Mr. Rafael CEREZO on 25/9/2014 at 14:40
The LHC allows to probe quantum gravity with large extra dimensions. Within the Asymptotic Safety scenario we present new constraints on the transition scale $\Lambda_T$ for the diphoton channel. These bounds will be compared to existing bounds from other channels, including Drell-Yan and MET plus jet.
Presented by Ms. Magdalena ZENGLEIN on 24/9/2014 at 14:20
The difficulties one faces when implementing CP transformations in the presence of finite non-abelian symmetries are reviewed. It is then shown that physical CP transformations in such settings always correspond to class-inverting automorphisms of the finite group and their connection to the existence of bases with real Clebsch-Gordan coefficients is explored. Furthermore, the finite groups are ca ... More
Presented by Mr. Maximilian FALLBACHER on 25/9/2014 at 14:25
Current Ice-Cube analyses show hints for an unexpected neutrino flavor ratio (1:0:0) at high energies. This may point to non-standard neutrino properties like LSND, MiniBooNE, ractor and Gallium anomalies do, e.g. sterile neutrinos. Here we discuss the 1+1 active-sterile neutrino mixing resulting from the altered dispersion relations of sterile neutrinos oscillating around a 3+1 brane in an asy ... More
Presented by Mr. Philipp SICKING on 25/9/2014 at 14:55
The new data from LHC, Planck and BICEP2 provide unseen possibilities for probing the early universe, its particle content and interactions between them. We study the cosmological constraints on a Standard Model extension with a real singlet scalar. I briefly introduce some of the main constraints on formation and decay of the scalar condensates in the early universe in order to consider the gener ... More
Presented by Mr. Tommi TENKANEN on 25/9/2014 at 15:20
The nature of the electroweak phase transition in two-Higgs-doublet models is revisited in light of the recent LHC results. A scan over an extensive region of their parameter space is performed, showing that a strongly first-order phase transition favours a light neutral scalar with SM-like properties, together with a heavy pseudo-scalar and a mass hierarchy in the scalar sector. Altogether, the ... More
Presented by Glauber CARVALHO DORSCH on 25/9/2014 at 14:20
Flavor effects play an important role in the time-evolution of particle number densities in a statistical ensemble with arbitrary flavor content. We present a fully flavor covariant formalism for transport phenomena, which captures consistently all flavor effects. As an application, we study flavor effects in a Minimal Resonant Leptogenesis scenario. In particular, we show that our flavor covarian ... More
Presented by Dr. Bhupal DEV on 25/9/2014 at 15:00
Lepton flavor violating Higgs decays can arise in flavor symmetry models where the Higgs sector is responsible for both the electroweak and the flavor symmetry breaking. Here we advocate a minimal $S_4$ Three-Higgs-Doublet-Model with Lepton Flavor Triality. This model can explain the $2.5\,\sigma$ excess of Higgs decay final states with a $\mu\tau$ topology reported recently by CMS if the Standa ... More
Presented by Mr. Erik SCHUMACHER on 24/9/2014 at 14:40
We study the possible signals at LHC of minimal models of decaying dark matter. Those models are characterized by the fact that DM interacts with SM particles through renormalizable coupling with an additional heavier charged state. Such interaction allows to produce a substantial abundance of DM in the early Universe via the decay of such charged heavy state, either in- or out-of-equilibrium. M ... More
Presented by Mr. Federico DRADI on 24/9/2014 at 14:00
We consider lepton flavour observables in the Randall-Sundrum (RS) model with and without custodial protection.To this end, we apply a fully five dimensional (5D) framework to calculate the matching coefficients of the effective field theory at the electroweak scale. This enables us to obtain predictions for the radiative decay $\mu \to e \gamma$ as well as the decay $\mu \to 3\,e$, the anom ... More
Presented by Mr. Paul MOCH on 25/9/2014 at 15:10
The search for Supersymmetry at the LHC is an ongoing task. Despite the LHC searches push the limits on coloured sparticles of the first two generations above the 1 − 1.5 TeV range, the lightest stop can still be rather light. The relevant stop search channels in the low-mass region are the flavour-changing neutral current (FCNC) decay of the lightest stop into a charm quark and the lightest neu ... More
Presented by Eva POPENDA on 24/9/2014 at 15:25
The search for supersymmetry is a central task of the Large Hadron Collider. The interpretation of the experimental data requires accurate and flexible theoretical predictions. We present a new calculation of the next-to-leading order supersymmetric-QCD corrections to the production and the decay of squarks. In particular, we provide fully differential cross sections matched to parton showers. We ... More
Presented by Mathieu PELLEN on 24/9/2014 at 14:55
The search for supersymmetry is an ongoing quest during the future runs of the LHC. Coloured supersymmetric particles are expected to be produced in large quantities due to the high production cross sections, should supersymmetry be realised in nature. Precise theoretical predictions are therefore needed to improve the search for these yet undiscovered particles. A way to increase precision, and t ... More
Presented by Mr. Christoph BORSCHENSKY on 24/9/2014 at 14:25
Deep-inelastic $ep$ scattering receives essential contributions from heavy flavors. The determination of the strong coupling constant $\alpha_s$ and the charm quark mass $m_c$ are sensitive to NNLO corrections. In the asymptotic region where the momentum transfer $Q^2$ is large compared to the mass of the heavy quark $m^2$ the heavy flavor contributions factorize into massless Wilson coeffici ... More
Presented by Arnd BEHRING on 24/9/2014 at 14:10
Many new physics models contain new particles that interact with the Higgs boson. These particles could be produced at the LHC via gluon-gluon fusion with an off-shell Higgs, as well as via the Drell-Yan process if charged under a gauge group. We consider simplified scenarios where the Standard Model is extended by one scalar or fermionic field that interacts with the Higgs boson and we evaluate t ... More
Presented by Mr. Andre HESSLER on 24/9/2014 at 14:40
Flavor changing neutral current |\Delta B|=|\Delta S|=1 processes are sensitive to possible new physics at the electroweak scale and beyond, providing detailed information about flavor, chirality and Lorentz structure. Recently the LHCb collaboration announced a 2.6 \sigma deviation in the measurement of R_K={\cal{B}}(\bar B \to \bar K \mu \mu)/{\cal{B}}(\bar B \to \bar K ee) from the standard mod ... More
Presented by Prof. Gudrun HILLER on 25/9/2014 at 14:40
We study the phenomenology of the Standard Model (SM) Higgs sector extended by two singlet scalars. The model has two CP-even scalars h_{1,2} where one of them corresponds to the observed 125 GeV scalar resonance; in addition to a scalar singlet that can be stable and plays the role of a dark matter candidate. We discuss the effect of the extra scalars on the Higgs triple couplings and show that ... More
Presented by Dr. Amine AHRICHE on 24/9/2014 at 15:00
It is currently widely accepted that for a high scale of inflation the EW Higgs vacuum is unstable during inflation due to large fluctuations of order H. However, this conclusion is reached by neglecting potentially significant effects induced by the spacetime curvature. In this talk I review the derivation of a one-loop SM Higgs effective potential in curved space and discuss its implications. In ... More
Presented by Tommi MARKKANEN on 25/9/2014 at 14:00
We discuss effective operators describing interactions between dark matter and Standard Model particles. We are particularly interested in higher-dimensional operators, since they are typically suppressed compared to the leading order effective operators. This can explain why no conclusive direct dark matter detection has been made so far. The ultraviolet completions of the effective operators, wh ... More
Presented by Dr. Martin KRAUSS on 24/9/2014 at 15:20
We determine the mass of the bottom quark from moments of the $b\bar{b}$ production cross section near threshold. On the theory side we use NNNLO predictions both for the resonances and the continuum cross section. We compare our result to other recent precision determinations.
Presented by Mr. Thomas RAUH on 24/9/2014 at 15:10
We study gravity with torsion in extra dimensions and derive an effective four-dimensional theory containing four-fermion contact operators at the fundamental scale of quantum gravity in the TeV range. These operators may have an impact on the low-energy observables and can manifest themselves or can be constrained in precision measurements. We calculate possible contributions of these operators t ... More
Presented by Cristóbal CORRAL on 25/9/2014 at 14:10
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