论文标题
Migdal效应和Photon Bremsstrahlung：提高对液体氩实验的光线的敏感性
Migdal effect and photon Bremsstrahlung: improving the sensitivity to light dark matter of liquid argon experiments
论文作者
论文摘要
与高贵液体相互作用的质量弱相互作用的搜索使质量向下探测，低于GEV/C^2。最终限制由能量转移到核后坐力的实验阈值表示。当前，实验灵敏度已达到与几个电离电子相当的阈值。在这些条件下，由于碰撞后的核突然加速，Bremsstrahlung光子或所谓的Migdal电子的贡献可能是相当的。在目前的工作中，我们使用贝叶斯方法研究如何在基于液体氩探测器的实验中利用这些效果。特别是，从Darkside-50公共光谱中汲取灵感，我们开发了一个模拟实验，以显示Migdal电子和Bremsstrahlung光子如何将实验灵敏度推向0.1 GEV/C^2的质量，从而扩展了先前结果的暗物质粒子的搜索区域。对于这些质量，我们估算了地球屏蔽的影响，即对于强烈相互作用的暗物质，任何探测器都蒙蔽了。最后，我们展示了如何提高暴露量的灵敏度。
The search for dark matter weakly interacting massive particles with noble liquids has probed masses down and below a GeV/c^2. The ultimate limit is represented by the experimental threshold on the energy transfer to the nuclear recoil. Currently, the experimental sensitivity has reached a threshold equivalent to a few ionization electrons. In these conditions, the contribution of a Bremsstrahlung photon or a so-called Migdal electron due to the sudden acceleration of a nucleus after a collision might be sizable. In the present work, we use a Bayesian approach to study how these effects can be exploited in experiments based on liquid argon detectors. In particular, taking inspiration from the DarkSide-50 public spectra, we develop a simulated experiment to show how the Migdal electron and the Bremsstrahlung photon allow to push the experimental sensitivity down to masses of 0.1 GeV/c^2, extending the search region for dark matter particles of previous results. For these masses we estimate the effect of the Earth shielding that, for strongly interacting dark matter, makes any detector blind. Finally, we show how the sensitivity scales for higher exposure.
