arXiv 1503.082812015-03-28hep-ph

利用共振湮灭直接探测暗物质

Direct detection of dark matter with resonant annihilation

Bo Li, Yu-Feng Zhou

备注：: 19 pages, 5 figures

摘要：

在暗物质粒子$χ\barχ$对通过共振粒子$R$湮灭的情形下，由于暗物质残余密度的限制，暗物质粒子与核的弹性散射截面极小，可以低于中微子与核的相干散射所产生的中微子本底，使得常规的暗物质粒子直接探测实验无法探测到暗物质粒子.本文对$s$波和$p$波的共振DM湮灭情形下DM残留物密度的解析计算进行了改进，并研究了DM核散射截面高于中微子本底的条件。我们证明了在Higgs门型模型中，对于具有$s$波湮灭的DM粒子，自旋无关的DM-核散射截面正比于$Γ_{R}/m_{R}$，即衰变宽度与$R$质量的比值.对于典型的DM粒子质量$\sim50$ GeV，该条件导致$Γ_{R}/m_{R} \gtrsim \mathcal{O}(10^{-4})$。在$p$波湮灭情况下，只要DM粒子比顶夸克轻，自旋无关散射截面对$Γ_{R}/m_{R}$不敏感，并且总是高于中微子背景。作为一个具体的例子，讨论了真正的单态DM模型。

英文摘要：

In the scenario where the dark matter (DM) particles $χ\barχ$ pair annihilate through a resonance particle $R$, the constraint from DM relic density makes the corresponding cross section for DM-nuclei elastic scattering extremely small, and can be below the neutrino background induced by the coherent neutrino-nuclei scattering, which makes the DM particle beyond the reach of the conventional DM direct detection experiments. We present an improved analytical calculation of the DM relic density in the case of resonant DM annihilation for $s$- and $p$-wave cases and invesitgate the condition for the DM-nuclei scattering cross section to be above the neutrino background. We show that in Higgs-portal type models, for DM particles with $s$-wave annihilation, the spin-independent DM-nucleus scattering cross section is proportional to $Γ_{R}/m_{R}$, the ratio of the decay width and the mass of $R$. For a typical DM particle mass $\sim50$ GeV, the condition leads to $Γ_{R}/m_{R} \gtrsim \mathcal{O}(10^{-4})$. In $p$-wave annihilation case, the spin-independent scattering cross section is insensitive to $Γ_{R}/m_{R}$, and is always above the neutrino background, as long as the DM particle is lighter than the top quark. The real singlet DM model is discussed as a concrete example.

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。

摘要：

英文摘要：

相关论文