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Low Mass Pseudoscalar Dark Matter in an Extended B - L Model
We study an extended B-L model, which has in its structure four neutral
scalars. In this model, a representative set of parameters enable us to
conclude that one of these scalars is a promising candidate for low-mass dark
matter. We introduce an Z_2 symmetry, which ensure the stability of the dark
matter. The dominant annihilation process will be through -channel exchange
of a scalar in . So, this is also a Higgs portal dark matter
model, but the Higgs decay to dark matter is suppressed and meets the
constraints from invisible decays of Higgs boson. The model is also in
agreement with the constraints established by XENON100, CoGeNT and CDMS
experiments, maching the relic abundance and the cross section with nucleon.Comment: Version submitted and accepted for publication in PR
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