发表机构
University of Chicago（芝加哥大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
XENONnT的$pp$中微子数据在$2\sigma$水平排除$\delta m_1^2 \gtrsim 5.9\times10^{-13}$ eV$^2$的赝狄拉克劈裂，最佳拟合为零劈裂。
AI 中文摘要
XENONnT测量了一个由$pp$中微子主导的低能太阳中微子信号。在这些能量下，超小的赝狄拉克质量平方劈裂会在太阳到地球的基线上诱发可探测的有源-惰性振荡。我们研究了第一质量本征态的赝狄拉克振荡，计算了由此产生的$pp+{}^7$Be电子反冲谱的修正，并根据已发表的XENONnT能谱构建了似然函数。我们发现最佳拟合出现在零赝狄拉克劈裂处，并在$2\sigma$置信水平下排除了$\delta m_1^2 \gtrsim 5.9\times10^{-13}\\,\mathrm{eV}^2$的值，接近先前为未来$pp$敏感探测器讨论的参数区间。
英文摘要
XENONnT has measured a low-energy solar-neutrino signal dominated by $pp$ neutrinos. At these energies, an ultra-small pseudo-Dirac mass-squared splitting induces detectable active-sterile oscillations over the Sun--Earth baseline. We study pseudo-Dirac oscillations of the first mass eigenstate, compute the resulting modification of the $pp+{}^7$Be electron-recoil spectrum, and construct a likelihood from the published XENONnT energy spectra. We find that the XENONnT data exclude $5.9\times10^{-13}\,\mathrm{eV}^2\lesssim δm_1^2 \leq 10^{-11}\,\mathrm{eV}^2$ at the $2σ$ level, extending current solar-neutrino sensitivity to smaller mass splittings and approaching a regime previously discussed for future $pp$-sensitive detectors.
Comments6+1 pages, 3 figures. Comments and feedback are welcome
