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We construct a new realization of type-II seesaw for neutrino masses andbaryon asymmetry by extending the standard model with one light and two heavysinglet scalars besides one Higgs triplet. The heavy singlets pick up smallvacuum expectation values to give a suppressed trilinear coupling between thetriplet and doublet Higgs bosons after the light singlet drives the spontaneousbreaking of lepton number. The Higgs triplet can thus remain light and beaccessible at the LHC. The lepton number conserving decays of the heavysinglets can generate a lepton asymmetry stored in the Higgs triplet to accountfor the matter-antimatter asymmetry in the Universe. We further introducestable gauge bosons from a hidden sector, which obtain masses and annihilateinto the Higgs triplet after spontaneous breaking of the associated non-Abeliangauge symmetry. With Breit-Wigner enhancement, the stable gauge bosons cansimultaneously explain the relic density of dark matter and the cosmicpositron/electron excesses.

Double Type-II Seesaw, Baryon Asymmetry and Dark Matter for Cosmic e^\pm Excesses