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arXiv 1607.00737hep-phastro-ph.CO
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WIMP湮灭到一对在壳标量介质中的研究

Study of WIMP annihilations into a pair of on-shell scalar mediators

Lian-Bao Jia

摘要:

在这篇文章中,我们专注于一个新的标量$ϕ$介导的标量/矢量WIMP(弱相互作用的大质量粒子),$ϕ$的质量略低于WIMP的质量。为了解释银河系中心1 - 3 GeV的伽马射线过剩,这里我们考虑的情况下,一个WIMP对主要湮灭成壳层上的$ϕϕ$对与$ϕ$主要衰减到$τ\barτ$。WIMPs的质量在14 - 22 GeV之间,并且WIMPs的湮灭在相空间中被抑制。在这个湮灭方案中,$ϕ$ -标准模型(SM)粒子的耦合几乎是任意小的,并且WIMP-核自旋无关散射可以被现有的暗物质(DM)直接探测所容忍。介绍了一种标量介体-Higgs场混合,它体积小,实用性强。导出了早期宇宙中热平衡对$ϕ$ -SM粒子耦合的下限约束,该约束在直接探测标量DM的中微子本底之上。在未来几年内,在升级后的DM直接探测实验中可能探测到WIMP,而在未来的高亮度$e^+ e^-$对撞机上可能观测到奇异衰变$h \rightarrow ϕϕ$和$ϕ$的产生。

英文摘要:

In this article, we focus on a new scalar $ϕ$ mediated scalar/vectorial WIMPs (weakly interacting massive particles) with $ϕ$'s mass slightly below the WIMP mass. To explain the Galactic center 1 - 3 GeV gamma-ray excess, here we consider the case that a WIMP pair predominantly annihilates into an on-shell $ϕϕ$ pair with $ϕ$ mainly decaying to $τ\barτ$. The masses of WIMPs are in a range about 14 - 22 GeV, and the annihilations of WIMPs are phase space suppressed today. In this annihilation scheme, the couplings of the $ϕ$ - standard model (SM) particles are almost arbitrary small, and the WIMP-nucleus spin-independent scattering can be tolerant by the present dark matter (DM) direct detections. A scalar mediator-Higgs field mixing is introduced, which is small and available. The lower limit on the couplings of the $ϕ$-SM particles set by the thermal equilibrium in the early universe is derived, and this constraint is above the neutrino background for scalar DM in direct detections. The WIMPs may be detectable at the upgraded DM direct detection experiment in the next few years, and the exotic decay $h \rightarrow ϕϕ$, the production of $ϕ$ may be observable at future high-luminosity $e^+ e^-$ collider.

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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