Seungwon Baek, P. Ko, Wan-Il Park
We consider a simple extension of the standard model with a singlet fermionic
dark matter. Its thermal relic density can be easily accommodated by a real
singlet scalar messenger that mixes with the standard model Higgs boson. The
model can change significantly the Higgs signals at the LHC via sizable
invisible decays of two Higgs-like scalar bosons. After imposing the
constraints from the electroweak precision tests, colliders and dark matter
search experiments, one concludes that two or one or none of the two Higgs
bosons, depending on the mass relations among two scalar bosons and the dark
matter fermion and their couplings. In particular, if a standard model
Higgs-like scalar boson is discovered around 120--125 GeV region at the LHC, it
would be almost impossible to find the second Higgs-like boson since it is
mostly a singlet scalar, whether it is heavier or lighter. This model can be
further tested by direct dark matter search experiments.
View original:
http://arxiv.org/abs/1112.1847
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