排他性B衰变在次主导幂次下依赖于结构的新 QED 效应
高能物理 - 唯象学
2026-01-23 v4
摘要
我们推导了弱排他过程 中依赖于结构的新 QED 效应（即探测 介子内部结构的效应）的因子化定理。该推导需要对次主导幂次因子化公式中常见的端点发散卷积进行细致处理。我们发现衰变振幅对 介子的两粒子和三粒子光锥分布振幅以及一个新的强子参数 敏感，后者在存在 QED 效应时推广了 介子衰变常数的概念。这是首个推导出软函数为非微扰强子矩阵元的次主导幂次因子化定理。
引用
@article{arxiv.2212.14430,
title = {Structure-Dependent QED Effects in Exclusive B Decays at Subleading Power},
author = {Claudia Cornella and Matthias König and Matthias Neubert},
journal= {arXiv preprint arXiv:2212.14430},
year = {2026}
}
备注
5 pages, 2 figures, v2: inclusion of soft-collinear modes in the factorization theorem, explicit expression for IR poles in the virtual amplitude given, references added, main conclusions unchanged, v3: clarifications added, definition of hadronic parameter F adjusted, matches journal version, v4: corrected operator definition, scheme-dep. terms and sign in three-particle contribution corrected