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arXiv 0912.4722hep-phastro-ph.COhep-ex
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最简单的暗物质模型、CDMS II结果和在LHC上的希格斯粒子探测

The Simplest Dark-Matter Model, CDMS II Results, and Higgs Detection at LHC

Xiao-Gang He, Tong Li, Xue-Qian Li, Jusak Tandean, Ho-Chin Tsai

摘要:

由CDMS II合作组进行的暗物质直接搜索实验观测到了两个候选事件。虽然这些事件不能被解释为弱相互作用大质量粒子(WIMP)暗物质(DM)存在的重要证据,但CDMS II的总数据已导致WIMP-核子自旋无关截面的上限得到改进。我们研究了这些结果对最简单的WIMP DM模型SM+D的一些影响,SM+D扩展了标准模型(SM),增加了一个真正的SM单线态标量场,称为暗子扮演DM的角色。我们发现,虽然CDMS II数据排除了相当大一部分的参数空间的模型,参数空间的很大一部分仍然是允许的。我们得到了暗子质量、暗子-核子截面、希格斯玻色子的质量及其不可见衰变的分支比之间的强关联。我们指出,在大型强子对撞机的希格斯不可见的分支比的测量可以解除一些可能的模糊性,在确定从直接DM搜索的暗子质量。

英文摘要:

The direct-search experiment for dark matter performed by the CDMS II Collaboration has observed two candidate events. Although these events cannot be interpreted as significant evidence for the presence of weakly interacting massive particle (WIMP) dark matter (DM), the total CDMS II data have led to an improved upper-limit on the WIMP-nucleon spin-independent cross-section. We study some implications of these results for the simplest WIMP DM model, the SM+D, which extends the standard model (SM) by the addition of a real SM-singlet scalar field dubbed darkon to play the role of the DM. We find that, although the CDMS II data rule out a sizable portion of parameter space of the model, a large part of the parameter space is still allowed. We obtain strong correlations among the darkon mass, darkon-nucleon cross-section, mass of the Higgs boson, and branching ratio of its invisible decay. We point out that measurements of the Higgs invisible branching-ratio at the LHC can lift some possible ambiguities in determining the darkon mass from direct DM searches.

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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