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arXiv 0906.0442hep-phastro-ph.COhep-th
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宇宙e^ \pm超的双II型跷跷板、重子不对称性和暗物质

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

Pei-Hong Gu, Hong-Jian He, Utpal Sarkar, Xinmin Zhang

摘要:

通过在标准模型中加入一个轻单重标量和两个重单重标量,以及一个Higgs三重态,构造了中微子质量和重子不对称性的第二类跷跷板的新实现.在轻单态驱动轻子数自发破缺后,重单态拾取小的真空期望值,从而抑制了三线态和二重态希格斯玻色子玻色子之间的三线耦合。因此,希格斯三重态可以保持轻,并在大型强子对撞机上可以接近。重单线态的轻子数守恒衰变可以产生储存在希格斯三重态中的轻子不对称性,以解释宇宙中的物质-反物质不对称性。我们进一步引入稳定的规范玻色子从一个隐藏的部门,获得质量和湮灭到希格斯三重态后,自发破缺相关的非阿贝尔规范对称性。在Breit-Wigner增强下,稳定规范玻色子可以同时解释暗物质的残余密度和宇宙正负电子过剩.

英文摘要:

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.

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