Reevaluation of the hadronic contribution to the muon magnetic anomaly using new e+e- → π+π- cross section data from BABAR

被引：132
|
作者：
Davier, M. [1 ]
Hoecker, A. [2 ]
Malaescu, B. [1 ]
Yuan, C. Z. [3 ]
Zhang, Z. [1 ]
机构：
[1] Univ Paris 11, CNRS, Lab Accelerateur Lineaire, IN2P3, F-91405 Orsay, France
[2] CERN, CH-1211 Geneva 23, Switzerland
[3] Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China
来源：
EUROPEAN PHYSICAL JOURNAL C | 2010年 / 66卷 / 1-2期
基金：
中国国家自然科学基金;
关键词：
PION FORM-FACTOR; SPECTRAL FUNCTIONS; ENERGY-RANGE; TAU-DECAYS; MOMENT; VECTOR; CMD-2; G-2; SIGMA(E(+)E(-); DOMINANCE;
D O I：
10.1140/epjc/s10052-010-1246-1
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：
Using recently published, high-precision pi(+)pi(-) cross section data by the BABAR experiment from the analysis of e(+)e(-) events with high-energy photon radiation in the initial state, we reevaluate the lowest order hadronic contribution (a(mu)(had,LO)) to the anomalous magnetic moment of the muon. We employ newly developed software featuring improved data interpolation and averaging, more accurate error propagation and systematic validation. With the new data, the discrepancy between the e(+)e(-) - and tau-based results for the dominant two-pion mode reduces from previously 2.4 sigma to 1.5 sigma in the dispersion integral, though significant local discrepancies in the spectra persist. We obtain for the e(+)e(-)-based evaluation a(mu)(had,LO) = (695.5+/-4.1) x10-(10), where the error accounts for all sources. The full Standard Model prediction of a(mu) differs from the experimental value by 3.2 sigma.
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收藏
页码：1 / 9
页数：9
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