非热太阳停滞：氙中非弹性标量信号
Solar Capture and Suppressed Annihilation of Inelastic Scalar Dark Matter
- Dalian University of Technology（大连理工大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
构建无反常U(1)模型解释LZ候选事件，通过太阳俘获演化显示非弹性标量暗物质停滞，太阳中微子约束不适用于轻介质标量实现。
AI中文摘要：
LUX-ZEPLIN实验在扩展能量搜索中报告了一个能量为$248\kev$的核反冲候选事件。我们构建了一个无反常的$U(1)_{B-3L_\tau}$模型，其中质量为$840\gev$的复标量经历分裂能为$320\kev$的吸热跃迁。一个具有暗电荷$Q_\chi=1$、质量为$160\mev$的矢量粒子在公开的LZ响应重建中给出$0.958$个接受事件，而标量湮灭产生$\Omega h^2=0.1200$。物理核子比$f_n/f_p=-0.86985$抑制了太阳铁俘获，留下$C_\odot=1.09\times10^{19}\\,{\rm s}^{-1}$。然后我们在能量、角动量和内部状态上演化俘获粒子，包括有限碰撞率、热核速度和激发态衰变。分布停滞在等效半径$r_{\rm eff}=0.194$--$0.198\rsun$处，此时$\Gamma_{\rm ann}=(1.33$--$1.38)\times10^{15}\\,{\rm s}^{-1}$，比模型特定的IceCube公开数据代理低三个数量级以上。该基准也低于专门的NA64 $B-L$限制。因此，太阳中微子对电弱非弹性暗物质的约束不能模型无关地转移到轻介质标量实现上。
英文摘要：
Solar capture of inelastic dark matter does not by itself fix the annihilation signal. We consider a scalar low-energy model with a $B-3L_τ$ current, motivated by the high-energy recoil candidate reported by LUX-ZEPLIN. For $m_χ=840~\mathrm{GeV}$, a $320~\mathrm{keV}$ splitting, and a $160~\mathrm{MeV}$ mediator, the public LZ response gives 0.965 expected accepted events, while micrOMEGAs gives $Ωh^2=0.11999834$. Finite-momentum nuclear responses leave iron as an important solar-capture target despite the near cancellation of its coherent charge at zero momentum transfer. The captured population remains extended after thermal nuclear motion, elastic and inelastic scattering, and excited-state decay are included, with $r_{\rm eff}=0.215R_\odot$. Same-state annihilation is open, but the inferred rate is only 0.0404 of the public IceCube $W^+W^-$-calibrated proxy and is smaller than the corresponding isothermal estimate by a factor of 628. For this benchmark, substantial solar capture is accompanied by a weak neutrino signal.
