Isospin violating effects in e+e- vs. τ measurements of the pion form factor |Fπ|2(s)

被引：78

作者：

Ghozzi, S ^{[1
]}

Jegerlehner, F ^{[1
]}

机构：

[1] DESY, Zeuthen, Germany

来源：

PHYSICS LETTERS B | 2004年 / 583卷 / 3-4期

关键词：

D O I：

10.1016/j.physletb.2004.01.021

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study possible so far unaccounted isospin breaking effects in the relation between the pion form factor as determined in e(+)e(-) experiments and the corresponding quantity obtained after accounting for known isospin breaking effects by an isospin rotation from the tau-decay spectra. In fact the observed 10% discrepancy in the respective pion form factors may be explained by the isospin breaking which is due to the difference between masses and widths of the charged and neutral rho mesons. Since the hadronic contribution to the muon anomalous magnetic moment can be calculated directly in terms of the e(+)e(-)-data the cortesponding evaluation seems to be more reliable. Our estimate is a(mu)(had(1)) = (694.8 +/- 8.6) x 10(-10). The tau-data are useful at the presently aimed level of accuracy only after appropriate input from theory. (C) 2004 Published by Elsevier B.V.

引用

页码：222 / 230

页数：9

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