次要形状函数与 |V_{ub}| 的确定
高能物理 - 唯象学
2010-04-05 v2
摘要
人们认为，charged-lepton 能谱在端点区域中对 衰变的主导次要形状函数贡献可以以一种与模型无关的方式与 光子谱的积分相关。 事件中 charged-lepton 能量高于 GeV 的比例的平方根可以从次要形状函数效应的残余理论不确定性下安全地控制在 10% 以下。这一效应因此对 |V_{ub}| 的确定影响不大。
引用
@article{arxiv.hep-ph/0207002,
title = {Subleading Shape Functions and the Determination of |V_{ub}|},
author = {Matthias Neubert},
journal= {arXiv preprint arXiv:hep-ph/0207002},
year = {2010}
}
备注
8 pages, 1 figure. Final version to appear in Physics Letters B. By a smarter choice of weight function, m_b and lambda_1 have been eliminated from the final results. A paragraph has been added mentioning the potentially sizeable uncertainty due to duality violations and spectator-dependent effects. The discussion of the results obtained in refs. [7,8] has been made more accurate