Update of the hadronic contribution to the QED vacuum polarization

被引：72

作者：

Burkhardt, H ^{[1
]}

Pietrzyk, B

机构：

[1] CERN, SL Div, CH-1211 Geneva 23, Switzerland

[2] IN2P3 CNRS, Phys Particules Lab, LAPP, F-74941 Annecy Le Vieux, France

来源：

PHYSICS LETTERS B | 2001年 / 513卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(01)00393-8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have updated the evaluation of the hadronic contribution to the running of the QED fine structure constant. It is obtained from a dispersion integral over a parametrization of the measured cross section of e(+)e(-) hadrons. We find this contribution to be Delta alpha ((5))(had)(s) = 0.02761 +/- 0.00036 at s = m(2) corresponding to 1/alpha ((5)) (m(Z)(2)) = 128.936 +/- 0.046. The improved experimental accuracy is mainly due to recent BES measurements. We have also updated and parametrized the hadronic contribution to Ce as a function of energy. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：46 / 52

页数：7

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