发表机构
Shanghai Jiao Tong University（上海交通大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出轻子phobic U(1)_B模型解释LZ实验的248 keV核反冲事件，通过重子数规范对称性自然产生稳定暗态和非对角相干流，在特定参数点与LHC双喷注限制相容，并预言了可被未来实验检验的媒介子质量范围。
AI 中文摘要
将LUX-ZEPLIN（LZ）报告的248 keV核反冲候选事件解释为吸热跃迁，通常需要两个人为引入的要素：一个稳定的暗态，以及一个纯非对角的相干流。重子数规范对称性同时提供了这两者。对于最小暗电荷 $B(\chi_L)=-3/2$ 和 $B(\chi_R)=-9/2$，产生暗质量的标量场留下一个精确的剩余宇称 $P=(-1)^{6B}$，稳定了最轻态，而相同的马约拉纳质量使矢量流跃迁成为主导，这是同一性而非选择的结果。在 $m_\chi=1$ TeV 和 $\delta=300$ keV 时，模型是超定的：观测到的LZ区间、领头阶遗迹丰度估计和LHC双喷注限制在单个微扰可接受点 $(M_{Z_B},g_B)\simeq(1.44~\mathrm{TeV},0.233)$ 处交汇。该点目前被现有搜索所允许，但恰好位于触发级双喷注边界之下，因此它仍然存活且尚未定论——对已记录在案的Run-3数据（$\sqrt s=13.6$ TeV）重新运行该分析，将排除它或发现它。这种解释并不局限于该质量劈裂：在 $\delta=200$ keV 时，同样的构造预测了一个在可比耦合下更重的媒介子，$M_{Z_B}\simeq2.4$-$3.0$ TeV 且 $g_B\simeq0.15$-$0.34$，这一范围将由HL-LHC双喷注计划进行探测。
英文摘要
Interpreting the $248$~keV nuclear-recoil candidate reported by LUX-ZEPLIN (LZ) as an endothermic transition needs two ingredients usually put in by hand: a stable dark state, and a coherent current that is purely off diagonal. Gauging baryon number supplies both. For the minimal dark charges $B(χ_L)=-3/2$ and $B(χ_R)=-9/2$, the scalars that generate the dark masses leave an exact residual parity $P=(-1)^{6B}$ stabilizing the lightest state, while the same Majorana masses make the vector current transition dominated as an identity rather than a choice. At $m_χ=1$~TeV and $δ=300$~keV the model is over-determined: the observed LZ interval, a leading-order relic estimate and the LHC dijet limit meet at the single perturbatively acceptable point $(M_{Z_B},g_B)\simeq(1.44~\mathrm{TeV},0.233)$. That point is allowed by currently existing searches but sits just below the trigger-level dijet boundary, so it is alive and not yet decided--and a re-run of that analysis on the Run-3 data at $\sqrt s=13.6$~TeV, already on tape, will exclude it or find it. Nor is the interpretation confined to that splitting: at $δ=200$~keV, the same construction predicts a heavier mediator at comparable coupling, $M_{Z_B}\simeq2.4$-$3.0$~TeV with $g_B\simeq0.15$-$0.34$, a range the HL-LHC dijet program will probe.
Comments10 pages, 4 figures, 1 table
