发表机构
Indian Institute of Technology Guwahati（印度理工学院古瓦哈提分校）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究利用LZ实验的异常事件和低能无结果，通过NREFT分析，排除了PBH蒸发产生的霍金增强暗物质，并给出了严格的丰度上限。
AI 中文摘要
LUX-ZEPLIN（LZ）合作组最近报告了一个在$248 \pm 23 \\; \rm keV$处的奇异反常核反冲事件，同时在其主要的$5.4-50 \\; \rm keV$搜索窗口中对无法解释的过量事件给出了严格的无结果。产生该事件所需的宏观动量转移在运动学上对于标准晕冷暗物质是不可达的，这自然激发了包含轻的相对论性遗留粒子的模型。在本工作中，我们研究了在$10^{11}-10^{13} \\; \rm g$质量范围内蒸发的原始黑洞（PBHs）所发射的当代霍金增强暗物质通量是否能解释该异常。通过使用重非相对论有效场论（NREFT）算符和吸热非弹性质量跃迁来参数化核散射，我们制定了一个严格的运动学排除。我们证明，霍金发射固有的热性质，加上入射通量的相对论性运动学，不可避免地过度产生低能反冲，严重违反LZ背景界限。利用这一失败，我们将LZ低能无结果映射为对PBH丰度分数的新颖且高度严格的上限，在90%置信水平下排除了$M_{\rm PBH} \sim 2 \times 10^{11} \\; \rm g$时$f_{\rm PBH} \gtrsim 10^{-6}$。
英文摘要
The LUX-ZEPLIN (LZ) collaboration recently reported a singular anomalous nuclear recoil event at $248 \pm 23 \, \rm keV$, accompanied by a strict null result for unexplained excesses in their primary $5.4-50 \, \rm keV$ search window. The macroscopic momentum transfer required to generate this event is kinematically inaccessible to standard halo cold dark matter (CDM), naturally motivating models featuring light, relativistic relics. In this work, we investigate whether a contemporary flux of Hawking-boosted dark matter (DM) emitted by evaporating Primordial Black Holes (PBHs) in the $10^{11}-10^{13} \, \rm g $ mass range can source the anomaly. By parameterizing the nuclear scattering with heavy non-relativistic effective field theory (NREFT) operators and endothermic inelastic mass transitions, we formulate a strict kinematic exclusion. We demonstrate that the inherent thermal nature of the Hawking emission, coupled with the relativistic kinematics of the incident flux, inevitably overproduces low-energy recoils, aggressively violating the LZ background bounds. Utilizing this failure, we map the LZ low-energy null results into novel, highly stringent upper limits on the PBH abundance fraction, excluding $f_{\rm PBH} \gtrsim 10^{-6}$ for $M_{\rm PBH} \sim 2 \times 10^{11} \, \rm g $ at $ 90 \% $ confidence level.
Comments8 pages, 2 figures. Minor typos corrected, references added
