AI 中文总结
研究利用暗物质直接探测实验中相干弹性中微子-核散射，对不可见太阳中微子衰变进行约束，通过联合分析核反冲数据约束了$\nu_{2}$寿命，评估未来氙基探测器灵敏度，结果显示核反冲和电子反冲数据可提升探测能力。
AI 中文摘要
太阳中微子的长基线和特征能量的结合为探测不可见中微子衰变提供了理想框架。本文利用暗物质直接探测实验中最近观测到的相干弹性中微子-核散射，首次对不可见太阳中微子衰变进行了约束。通过对XENONnT、PandaX-4T和LUX-ZEPLIN的核反冲数据进行联合分析，我们约束了中微子质量态$\nu_{2}$的寿命，得到的限制强度已与萨德伯里中微子观测站相当。我们还评估了未来基于氙的暗物质探测器可能达到的灵敏度。对于这个预测，我们将分析扩展到电子反冲数据，估计通过与电子的弹性散射探测来自pp链的低能太阳中微子的影响。这个通道将使我们能够对$\nu_{1}$和$\nu_{2}$质量本征态的寿命施加强约束。我们的结果表明，在未来的标称曝光量下，核反冲数据将使当前的限制提高约一个数量级，而电子反冲数据将为低能太阳中微子开辟一个新的探测通道，比现有的专用太阳中微子限制高出1至2个数量级。
英文摘要
The combination of the long baseline and characteristic energies of solar neutrinos offers an ideal framework to probe invisible neutrino decay. In this work we present the first constraint on invisible solar-neutrino decay using coherent elastic neutrino-nucleus scattering, recently observed in dark matter direct detection experiments. Through a combined analysis of nuclear-recoil data from XENONnT, PandaX-4T, and LUX-ZEPLIN, we constrain the lifetime of the neutrino mass state $ν_{2}$, obtaining a bound already comparable in strength to that from the Sudbury Neutrino Observatory. We further evaluate the sensitivity that could be reached by a future xenon-based dark matter detector. For this projection, we extend the analysis to electronic-recoil data, estimating the impact of detecting lower-energy solar neutrinos from the $pp$-chain via elastic scattering off electrons. This channel would allow us to place strong constraints on the lifetimes of both the $ν_{1}$ and $ν_{2}$ mass eigenstates. Our results show that, with nominal future exposures, nuclear-recoil data would improve the current bound by about one order of magnitude, while electronic-recoil data would open a new detection channel for low-energy solar neutrinos, surpassing existing dedicated solar-neutrino bounds by 1 to 2 orders of magnitude.
Comments17 pages, 1 table, 6 figures
