The hadronic contribution to (g-2)μ

被引：102

作者：

Davier, Michel ^{[1
]}

机构：

[1] Univ Paris 11, CNRS, IN2P3, Lab Accelerateur Lineaire, F-91898 Orsay, France

来源：

NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2007年 / 169卷

关键词：

D O I：

10.1016/j.nuclphysbps.2007.03.023

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：

The evaluation of the hadronic contribution to the muon magnetic anomaly a. is revisited, taking advantage of new experimental data on e(+)e(-) annihilation into hadrons: SND and CMD-2 for the pi(+)pi(-) channel, and BABAR for multihadron final states. Discrepancies are observed between KLOE and CMD-2/SND data, preventing one from averaging all the e(+)e(-) results. The long-standing disagreement between spectral functions obtained from tau decays and e(+)e(-) annihilation is still present, and not accounted by isospin-breaking corrections, for which new estimates have been presented. The updated Standard Model value for a(mu) based on e(+)e(-) annihilation data is now reaching a precision better than experiment, and it disagrees with the direct measurement from BNL at the 3.3 sigma level, while the tau-based estimate is in much better agreement. The tau/e(+)e(-) discrepancy, best revealed when comparing the measured branching fraction for tau(-) -> pi(-)pi(0)nu(tau) to its prediction from the isospin-breaking-corrected e(+)e(-) spectral function, remains a serious problem to be understood.

引用

页码：288 / 296

页数：9

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