Improved determination of the hadronic contribution to the muon (g-2) and to α(MZ2) -: Using new data from hadronic τ decays

被引:228
作者
Alemany, R [1 ]
Davier, M
Hocker, A
机构
[1] CERN, CH-1211 Geneva 23, Switzerland
[2] Univ Paris Sud, CNRS, IN2P3, Accelerateur Lineaire Lab, F-91405 Orsay, France
来源
EUROPEAN PHYSICAL JOURNAL C | 1998年 / 2卷 / 01期
关键词
D O I
10.1007/s100520050127
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We have reevaluated the hadronic contribution to the anomalous magnetic moment of the muon (g - 2) and to the running of the QED fine structure constant alpha(s) at s = M-Z(2). We incorporated new data from hadronic tau decays, recently published by the ALEPH Collaboration. In addition, compared to previous analyses, vee use more extensive e(+)e(-) annihilation data sets. The integration over the total hadronic cross section is performed using experimental data up to 40 GeV and results from perturbative QCD above 40 GeV. The improvement from tau data concerns mainly the pion form factor, where the uncertainty in the corresponding integral could be reduced by more than a factor of two. We obtain for the lowest order hadronic vacuum polarization graph alpha(mu)(had) = (695.0 +/- 15.0) x 10(-10) and Delta alpha(had)((5))(M-Z(2)) = (280.9 +/- 6.3) x 10(-4) using e(+)e(-) data only. The corresponding results for combined e(+)e(-) and tau data are alpha(mu)(had) = (701.1 +/- 9.4) x 10(-10) and Delta alpha(had)((5))(M-Z(2)) = (281.7 +/- 6.2) x 10(-4), where the latter is calculated using the contribution from the five lightest quarks.
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页码:123 / 135
页数:13
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