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arXiv 2007.04989hep-phhep-ex
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光暗物质直接探测的一个诱人方案

An Attractive Scenario for Light Dark Matter Direct Detection

Hooman Davoudiasl, Peter B. Denton, Julia Gehrlein

摘要:

如果轻暗物质的速度远高于$v\sim 10^{-3}$的维里值,则通过电子反冲直接探测低于GeV尺度的轻暗物质(DM)是有效的。我们指出,如果有一个长距离的吸引力来源于散装普通物质,即重子或电子,DM可以加速向地球和达到速度$v\sim 0.1$附近的地球表面。在这个“有吸引力的场景”中,所有DM在到达实验室中的直接检测设备时将被提升到高速度。此外,吸引力导致地球上DM数密度的增强,从而更有利于DM探测。我们阐明了这种情况下的电子反冲直接探测实验的影响,并找到可能导致潜在信号的参数,同时与恒星冷却和其他边界相一致。我们的方案可以潜在地解释最近过量的电子反冲信号报告的XENON1T实验在$\sim$千电子伏的能量制度,以及暗示非标准的恒星冷却。

英文摘要:

Direct detection of light dark matter (DM), below the GeV scale, through electron recoil can be efficient if DM has a velocity well above the virial value of $v\sim 10^{-3}$. We point out that if there is a long range attractive force sourced by bulk ordinary matter, i.e. baryons or electrons, DM can be accelerated towards the Earth and reach velocities $v\sim 0.1$ near the Earth's surface. In this "attractive scenario," all DM will be boosted to high velocities by the time it reaches direct detection apparatuses in laboratories. Furthermore, the attractive force leads to an enhanced DM number density at the Earth facilitating DM detection even more. We elucidate the implications of this scenario for electron recoil direct detection experiments and find parameters that could lead to potential signals, while being consistent with stellar cooling and other bounds. Our scenario can potentially explain the recent excess in electron recoil signals reported by the XENON1T experiment in the $\sim$ keV energy regime as well as the hint for non-standard stellar cooling.

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