超大质量带电引力微子与Lux-Zeplin事件

中文摘要 AI 辅助

Lux-Zeplin合作组最近报告了一个不寻常的事件，该事件被解释为WIMP的首个证据（arXiv:2609.02823 [hep-ex]）。在本笔记中，我们基于先前提出的暗物质可能由分数电荷超大质量引力微子构成的建议，为该事件提供另一种解释。这两种解释的主要区别在于：对于WIMP，预期的是小截面和大通量率；而对于超大质量引力微子则相反，即大（电磁）截面和极低的通量率。观测到的约250 keV的核反冲能量以及一年内发生一个事件，与（K.A. Meissner, H. Nicolai, Eur.Phys.J.C 84 (2024) 3, 269）中引用的估计值吻合良好。新解释的一个主要特征，使其与WIMP假说明确区分开来，是在引力微子直线轨迹上几微秒内依次出现两次或多次反冲，这一预测仍有待验证。这样的测量还将有助于克服“中微子底”。在本笔记中，我们细化了先前的估计，并提出一些额外步骤，以使实验能够区分WIMP和引力微子假说。

英文摘要

The Lux-Zeplin collaboration recently reported one unusual event which was interpreted as first evidence for a WIMP (arXiv:2609.02823[hep-ex]). In this note we offer an alternative explanation of this event, following our earlier proposal that dark matter could consist of fractionally charged supermassive gravitinos. A main difference between the two interpretations is that one expects small cross sections and large flux rates for WIMPs, whereas it is the opposite for supermassive gravitinos, namely large (electromagnetic) cross sections and very low flux rates. The observed nuclear recoil energy of about 250 keV and the occurrence of one event in one year fit well with the estimates quoted in (K.A. Meissner, H.~Nicolai, Eur.Phys.J.C 84 (2024) 3, 269). A main characteristic of the new interpretation distinguishing it unequivocally from the WIMP hypothesis would be the sequential occurrence of two or more recoils within a few microseconds along the gravitino's straight trajectory, a prediction that remains to be checked. Such a measurement would also allow to overcome the `neutrino floor'. In this note we refine our previous estimates and propose some extra steps so as to enable the experiment to discriminate between the WIMP and gravitino hypotheses.

发表机构

• University of Warsaw（华沙大学）
• Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut)（马克斯·普朗克引力物理研究所（爱因斯坦研究所））

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