ALEPH Tau Spectral Functions and QCD

被引：17
作者：
Davier, M. [1 ]
Hoecker, A.
Zhang, Z.
机构：
[1] Univ Paris 11, Lab Accelerateur Lineaire, F-91898 Orsay, France
[2] CERN, Div Phys, CH-1211 Geneva 23, Switzerland
来源：
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2007年 / 169卷
关键词：
D O I：
10.1016/j.nuclphysbps.2007.02.109
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：
Hadronic tau decays provide a clean laboratory for the precise study of quantum chromodynamics (QCD). Observables based on the spectral functions of hadronic tau decays can be related to QCD quark-level calculations to determine fundamental quantities like the strong coupling constant, quark and gluon condensates. Using the ALEPH spectral functions and branching ratios, complemented by some other available measurements, and a revisited analysis of the theoretical framework, the value alpha(s) (m(tau)(2)) = 0.345 +/- 0.004(exp) +/- 0.009(th) is obtained. Taken together with the determination of as (M-Z(2)) from the global electroweak fit, this result leads to the most accurate test of asymptotic freedom: the value of the logarithmic slope of alpha(-1)(S) 1 (s) is found to agree with QCD at a precision of 4%. The value of alpha(s)(M-z(2)) obtained from tau decays is as(M-Z(2)) = 0.1215 0.0004(CXP) +/- 0.0010(th) +/- 0.0005(evol) = 0.1215 +/- 0.0012
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页码：22 / 35
页数：14
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