Céline Bœhm

Extended gamma-ray emission from Coy Dark Matter

We show that it is possible for WIMP dark matter to produce a large signal in indirect dark matter searches without producing signals elsewhere. We illustrate our point by fitting the Fermi-LAT extended galactic gamma-ray excess with a simple model of Dirac dark matter that annihilates primarily into b quarks via a pseudoscalar. Current collider constraints are weak while the 14 TeV LHC run will constrain a limited portion of the parameter space. No signal is expected in additional indirect searches or at future direct detection experiments. Our results emphasise the importance of fully understanding potential indirect signals of dark matter as they may provide the only information about the dark matter particle.

125 GeV Higgs boson in the NMSSM in light of the LHC results and astrophysics constraints

Recent LHC data suggest an excess in the Higgs decay channels into

Naturalness of Light Neutralino Dark Matter in pMSSM after LHC, XENON100 and Planck Data

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Light and heavy dark matter particles

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Constraints on dark matter and the shape of the Milky Way dark halo from the 511‐keV line

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Interplay and Characterization of Dark Matter Searches at Colliders and in Direct Detection Experiments

at

Using the Milky Way satellites to study interactions between cold dark matter and radiation

\ensuremath{\sim}125\text{ }\text{ }\mathrm{GeV}

A lower bound on the mass of cold thermal dark matter from Planck

. The current excess in the diphoton channel is twice that expected from a standard model (SM) Higgs boson; while this may well change with more statistics, it is interesting to consider the implications should the result persist. Here, we assess whether the next-to-minimal supersymmetric standard model with a neutralino dark matter candidate could explain this excess when astrophysical constraints (e.g., no overproduction of gamma rays and radio emission in the galaxy, no anomalous excess in the dark matter direct detection experiments, and no dark matter overabundance) are imposed on the neutralino. This enables us to disregard unphysical regions of the parameter space even though the Higgs signal is compatible with the observed excess. The result of our analysis is that there are configurations of the parameter space that can explain the signal strength reported by the ATLAS and CMS Collaborations for a Higgs mass within the required range. Should the observed signal strength finally be compatible with SM expectations, it would be difficult to distinguish between the discovery of SM Higgs boson and a SM-like Higgs boson from the next-to-minimal supersymmetric standard model, unless one performs dedicated searches of very light Higgs bosons and possibly investigates peculiar signatures of supersymmetric particles. We also propose a new

PAMELA and FERMI limits on the neutralino-chargino mass degeneracy

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