Light scalar WIMP through the Higgs portal and CoGeNT
- Deutsches Elektronen Synchrotron, Notkestrasse 85, D-22603 Hamburg (Germany)
- Service de Physique Theorique, Universite Libre de Bruxelles, CP225, Bld du Triomphe, 1050 Brussels (Belgium)
If dark matter (DM) simply consists in a scalar particle interacting dominantly with the Higgs boson, the ratio of its annihilation cross section--which is relevant both for the relic abundance and indirect detection--and its spin-independent scattering cross section on nuclei depends only on the DM mass. It is an intriguing result that, fixing the mass and direct detection rate to fit the annual modulation observed by the DAMA experiment, one obtains a relic density in perfect agreement with its observed value. In this article we update this result and confront the model to the recent CoGeNT data, tentatively interpreting the excess of events in the recoil energy spectrum as being due to DM. CoGeNT, as DAMA, points toward a light DM candidate, with somewhat different (but not necessarily incompatible) masses and cross sections. For the CoGeNT region too, we find an intriguing agreement between the scalar DM relic density and direct detection constraints. We give the 1{sigma} region favored by the CDMS-II events, and our exclusion limits for the Xenon10 (2009) and Xenon100 data, which, depending on the scintillation efficiency, may exclude CoGeNT and DAMA. Assuming CoGeNT and/or DAMA to be due to scalar singlet DM leads to definite predictions regarding indirect detection and at colliders. We specifically emphasize the limit on the model that might be set by the current Fermi-LAT data on dwarf galaxies, and the implications for the search for the Higgs at the LHC.
- OSTI ID:
- 21420927
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 82, Issue 4; Other Information: DOI: 10.1103/PhysRevD.82.043522; (c) 2010 American Institute of Physics; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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79 ASTROPHYSICS
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ANNIHILATION
CERN LHC
CROSS SECTIONS
DENSITY
DETECTION
EFFICIENCY
ENERGY SPECTRA
FORECASTING
GALAXIES
HIGGS MODEL
MASS
NONLUMINOUS MATTER
NUCLEI
PARTICLES
RECOILS
SCATTERING
SCINTILLATIONS
SPIN
WEAK INTERACTIONS
ACCELERATORS
ANGULAR MOMENTUM
BASIC INTERACTIONS
CYCLIC ACCELERATORS
INTERACTIONS
MATHEMATICAL MODELS
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PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
SPECTRA
STORAGE RINGS
SYNCHROTRONS