τ和e+e-谱函数差异的再审视及其对μ子磁矩反常的影响
高能物理 - 唯象学
2014-11-20 v3
摘要
我们重新审视了比较τ衰变中测得的ππ谱函数与e+e-湮灭中获得的谱函数的步骤。我们利用新的实验和理论输入重新检查了同位旋破缺修正，发现τ- → π- π0 ντ分支比的测量值与其使用经同位旋破缺修正的e+e- → π+π-谱函数的预测值之间的一致性有所改善，但并未解决所有差异。我们利用新的修正，基于e+e-和τ数据重新计算了μ子g-2的最低阶强子贡献，发现两种评估之间的差异有所减小。基于τ的新估计的μ子磁矩反常值比直接测量值低1.9个标准差。
引用
@article{arxiv.0906.5443,
title = {The Discrepancy Between tau and e+e- Spectral Functions Revisited and the Consequences for the Muon Magnetic Anomaly},
author = {M. Davier and A. Hoecker and G. Lopez Castro and B. Malaescu and X. H. Mo and G. Toledo Sanchez and P. Wang and C. Z. Yuan and Z. Zhang},
journal= {arXiv preprint arXiv:0906.5443},
year = {2014}
}
备注
10 pages, 6 figures, submitted to Eur. Phys. J. C; (v2): Revised version with improved and uniform treatment of tau and e+e- data with HVPTools and a few minor bug fixes; (v3): Final version accepted for publication