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arXiv 1102.3024hep-phastro-ph.CO
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标准模型的实规范单重标量延拓:冷暗物质的可能候选者

The Real Gauge Singlet Scalar Extension of Standard Model: A Possible Candidate of Cold Dark Matter

Anirban Biswas, Debasish Majumdar

摘要:

本文考虑了标准模型的一个最简单的推广,其中在标准模型中引入了一个带有离散对称性$Z_2$的实SM规范单重标量。这个额外的标量可以是冷暗物质的可行候选者,因为$S$的稳定性是通过在$S$上应用$Z_2$对称性来实现的。考虑到$S$可能是冷暗物质的候选者,我们求解了玻尔兹曼方程,得到了在5 GeV到1 TeV标量质量范围内,当Higgs质量为120 GeV时,$S$的冻结温度和残余密度。由于$HHSS$耦合$δ_2$出现在拉格朗日依赖于标量质量$m_S$和Higgs质量$m_h$的值,我们约束$m_S - δ_2$参数空间,通过使用WMAP限制宇宙中的暗物质的残余密度和最近正在进行的暗物质直接搜索实验,即CDMS-II,CoGeNT,DAMA,EDELWEISS-II,XENON-10,XENON-100的结果。从这样的分析中,我们发现两个不同的质量区域(较低和较高的质量域)这样的暗物质候选人,满足WMAP限制和实验结果考虑在这里。我们已经估计了可能的差分直接检测率和总检测率的年度变化的标量暗物质候选人$S$的两种探测器材料,即锗,锗。最后,我们计算了由于两个130 GeV纯量暗物质湮灭为两条单能$γ-$射线而产生的来自银河系中心的$γ-$射线通量。

英文摘要:

We consider a simplest extension of Standard Model in which a real SM gauge singlet scalar with an additional discrete symmetry $Z_2$ is introduced to SM. This additional scalar can be a viable candidate of cold dark matter since the stability of $S$ is achieved by the application of $Z_2$ symmetry on $S$. Considering $S$ as a possible candidate of cold dark matter we have solved Boltzmann's equation to find the freeze out temperature and relic density of $S$ for Higgs mass 120 GeV in the scalar mass range 5 GeV to 1 TeV. As $HHSS$ coupling $δ_2$ appearing in Lagrangian depends upon the value of scalar mass $m_S$ and Higgs mass $m_h$, we have constrained the $m_S - δ_2$ parameter space by using the WMAP limit on the relic density of dark matter in the universe and the results of recent ongoing dark matter direct search experiments namely CDMS-II, CoGeNT, DAMA, EDELWEISS-II, XENON-10, XENON-100. From such analysis we find two distinct mass regions (a lower and higher mass domain) for such a dark matter candidate that satisfy both the WMAP limit and the experimental results considered here. We have estimated the possible differential direct detection rates and annual variation of total detection rates for this scalar dark matter candidate $S$ for two detector materials namely Ge, Xe. Finally we have calculated the $γ-$ray flux from the galactic centre due to annihilation of two 130 GeV scalar dark matter into two monoenergetic $γ-$rays.

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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