发表机构
TRIUMF; Department of Physics and Astronomy, University of Victoria; Department of Physics, Simon Fraser University（特利昂夫实验室; 维多利亚大学物理与天文学系; 西蒙菲莎大学物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究探讨Belle II的单光子过程$e^+e^- \to \boldsymbol{\nu}\boldsymbol{\bar{\nu}}$，可测量中微子有效弱混合角，其极化束流方案可研究中微子规范相互作用手征结构，同时该过程是暗玻色子搜寻的不可约本底。
AI 中文摘要
Belle II上的单光子过程$e^+e^- \to \boldsymbol{\nu}\boldsymbol{\bar{\nu}}$可同时探测不可见新粒子态和中微子的电弱耦合。本研究分析过程$e^+e^- \to \boldsymbol{\nu}\boldsymbol{\bar{\nu}}$，发现Belle II获取全部预期数据集后，可将对中微子敏感的有效弱混合角的相对统计精度确定至3.6%，与其他能量尺度下现有中微子探测手段相当。拟议的Chiral Belle升级方案采用极化束流，可分离中性流与带电流贡献并分别获取，为研究中微子规范相互作用的手征结构提供途径。该过程同时是暗玻色子搜寻的不可约本底，当亮度超过1 ab⁻¹时会产生中微子雾。
英文摘要
The mono-photon process $e^+e^- \to γ+\mathrm{invisible}$ at Belle II probes both invisible new states and the electroweak couplings of neutrinos. In this work, we study the process $e^+e^- \to γν\barν$, finding that Belle II with the full expected dataset can determine the neutrino-sensitive effective weak mixing angle to a 3.6$\%$ relative statistical precision, competitive with existing neutrino probes at other energy scales. Polarized beams, as proposed for the Chiral Belle upgrade, separate the neutral- and charged-current contributions and provide independent access to each, giving a handle on the chiral structure of the neutrino gauge interactions. The same process is an irreducible background to dark boson searches, producing a neutrino fog once the luminosity exceeds 1 ab$^{-1}$.
Comments8 pages, 4 figures
