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arXiv 1102.1522hep-phastro-ph.COhep-exnucl-exnucl-th
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暗子模型中的低质量暗物质和不可见希格斯粒子宽度

Low Mass Dark Matter and Invisible Higgs Width In Darkon Models

Yi Cai, Xiao-Gang He, Bo Ren

摘要:

标准模型(SM)加上一个称为暗子的实规范单重态标量场(SM+D)是最简单的具有弱相互作用大质量粒子(WIMP)暗物质候选者的模型。在该模型中,参数由暗物质遗迹密度和直接搜索约束。暗子和SM粒子之间的相互作用仅由希格斯玻色子交换介导的事实可能导致对希格斯玻色子性质的显著修改。如果暗物质的质量小于希格斯玻色子质量的一半,希格斯玻色子可以衰变成一对暗子,从而产生一个大的不可见的分支比。希格斯玻色子将在大型强子对撞机上被搜寻,很可能在不久的将来被发现。如果一个不可见衰变宽度很小的希格斯玻色子将被发现,那么具有小暗物质质量的SM+D模型将陷入困境。我们发现,通过将SM+D模型推广到两个Higgs二重态加一个暗子模型(THDM+D),可以得到一个具有较小不可见分支比的希格斯玻色子,同时暗物质可以具有较低的质量.我们还评论这个模型的其他影响。

英文摘要:

The Standard Model (SM) plus a real gauge-singlet scalar field dubbed darkon (SM+D) is the simplest model possessing a weakly interacting massive particle (WIMP) dark-matter candidate. In this model, the parameters are constrained from dark matter relic density and direct searches. The fact that interaction between darkon and SM particles is only mediated by Higgs boson exchange may lead to significant modifications to the Higgs boson properties. If the dark matter mass is smaller than a half of the Higgs boson mass, the Higgs boson can decay into a pair of darkons resulting in a large invisible branching ratio. The Higgs boson will be searched for at the LHC and may well be discovered in the near future. If a Higgs boson with a small invisible decay width will be found, the SM+D model with small dark matter mass will be in trouble. We find that by extending the SM+D to a two-Higgs-doublet model plus a darkon (THDM+D) it is possible to have a Higgs boson with a small invisible branching ratio and at the same time the dark matter can have a low mass. We also comment on other implications of this model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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