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arXiv 2002.04038hep-phastro-ph.COhep-ex
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Co-SIMP奇迹

Co-SIMP Miracle

Juri Smirnov, John F. Beacom

摘要:

我们提出了一个新的机制,热产生的暗物质,半湮灭的过程,$χ+ χ+\text{SM} \rightarrow χ+ \text{SM}$的基础上,有趣的后果暗物质的属性。首先,它的质量很低,为$\lesssim 1$ GeV(但为了避免结构形成的限制,它的质量是$\gtrsim 5$ keV)。第二,它是强相互作用的,导致暗区和可见区之间的动力学平衡,避免了$χ+ χ+ χ\rightarrow χ+ χ$模型的结构形成问题。第三,在$3 \rightarrow 2$过程中,一个暗物质粒子被消耗,使标准模型粒子产生单能反冲。我们表明,这种新的情况是目前允许的,这是令人惊讶的(也许是一个“小奇迹”)。然而,它可以在目前和近期的实验中通过新的分析进行系统的测试。特别是,热遗迹暗物质的Co-SIMP模型可以解释XENON 1 T过剩。

英文摘要:

We present a new mechanism for thermally produced dark matter, based on a semi-annihilation-like process, $χ+ χ+\text{SM} \rightarrow χ+ \text{SM}$, with intriguing consequences for the properties of dark matter. First, its mass is low, $\lesssim 1$ GeV (but $\gtrsim 5$ keV to avoid structure-formation constraints). Second, it is strongly interacting, leading to kinetic equilibrium between the dark and visible sectors, avoiding the structure-formation problems of $χ+ χ+ χ\rightarrow χ+ χ$ models. Third, in the $3 \rightarrow 2$ process, one dark matter particle is consumed, giving the standard-model particle a monoenergetic recoil. We show that this new scenario is presently allowed, which is surprising (perhaps a "minor miracle"). However, it can be systematically tested by novel analyses in present and near-term experiments. In particular, the Co-SIMP model for thermal-relic dark matter can explain the XENON1T excess.

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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