The discrepancy between tau and e (+) e (-) spectral functions revisited and the consequences for the muon magnetic anomaly

	The discrepancy between tau and e (+) e (-) spectral functions revisited and the consequences for the muon magnetic anomaly
	Davier, M; Hoecker, A; Castro, GL; Malaescu, B; Mo, XH; Sanchez, GT; Wang, P; Yuan, CZ; Zhang, Z; Mo XH(莫晓虎)
刊名	EUROPEAN PHYSICAL JOURNAL C
	2010
卷号	66 期号:1-2 页码:#REF!
通讯作者	Davier, M (reprint author), Univ Paris 11, CNRS, Lab Accelerateur Lineaire, IN2P3, F-91405 Orsay, France.
英文摘要	We revisit the procedure for comparing the pi pi spectral function measured in tau decays to that obtained in e (+) e (-) annihilation. We re-examine the isospin-breaking corrections using new experimental and theoretical input and find improved agreement between the tau (-)->pi (-) pi (0) nu (tau) branching fraction measurement and its prediction using the isospin-breaking-corrected e (+) e (-)->pi (+) pi (-) spectral function, though not resolving all discrepancies. We recompute the lowest order hadronic contributions to the muon g-2 using e (+) e (-) and tau data with the new corrections and find a reduced difference between the two evaluations. The new tau-based estimate of the muon magnetic anomaly is found to be 1.9 standard deviations lower than the direct measurement.
学科主题	Physics
类目[WOS]	Physics, Particles & Fields
收录类别	SCI
WOS记录号	WOS:000275453500007
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/226353]
专题	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Davier, M,Hoecker, A,Castro, GL,et al. The discrepancy between tau and e (+) e (-) spectral functions revisited and the consequences for the muon magnetic anomaly[J]. EUROPEAN PHYSICAL JOURNAL C,2010,66(1-2):#REF!.
APA	Davier, M.,Hoecker, A.,Castro, GL.,Malaescu, B.,Mo, XH.,...&苑长征.(2010).The discrepancy between tau and e (+) e (-) spectral functions revisited and the consequences for the muon magnetic anomaly.EUROPEAN PHYSICAL JOURNAL C,66(1-2),#REF!.
MLA	Davier, M,et al."The discrepancy between tau and e (+) e (-) spectral functions revisited and the consequences for the muon magnetic anomaly".EUROPEAN PHYSICAL JOURNAL C 66.1-2(2010):#REF!.