Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-06-02
Phys.Rev.D80:053004,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 4 figures, minor rewording, final PRD version (in Press)
Scientific paper
10.1103/PhysRevD.80.053004
We construct a new realization of type-II seesaw for neutrino masses and baryon asymmetry by extending the standard model with one light and two heavy singlet scalars besides one Higgs triplet. The heavy singlets pick up small vacuum expectation values to give a suppressed trilinear coupling between the triplet and doublet Higgs bosons after the light singlet drives the spontaneous breaking of lepton number. The Higgs triplet can thus remain light and be accessible at the LHC. The lepton number conserving decays of the heavy singlets can generate a lepton asymmetry stored in the Higgs triplet to account for the matter-antimatter asymmetry in the Universe. We further introduce stable gauge bosons from a hidden sector, which obtain masses and annihilate into the Higgs triplet after spontaneous breaking of the associated non-Abelian gauge symmetry. With Breit-Wigner enhancement, the stable gauge bosons can simultaneously explain the relic density of dark matter and the cosmic positron/electron excesses.
Gu Pei-Hong
He Hong-Jian
Sarkar Utpal
Zhang Xinmin
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