THE TAU-LEPTONIC CURRENT - LIFETIME, LEPTONIC BRANCHING RATIOS AND MICHEL PARAMETERS

被引：19

作者：

DAVIER, M

机构：

[1] UNIV PARIS 11, F-91405 ORSAY, FRANCE

[2] CNRS, INST NATL PHYS NUCL & PHYS PARTICULES, ACCELERATEUR LINEAIRE LAB, F-91405 ORSAY, FRANCE

来源：

NUCLEAR PHYSICS B | 1995年

关键词：

D O I：

10.1016/0920-5632(95)00166-7

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：

A review of results probing the tau leptonic current is given. No evidence is found for a departure from a V-A current at a precision level about one order of magnitude worse than for the muon. Precise measurements of the tau lifetime are presented by LEP experiments, indicating a smaller value compared to older experiments. The world average of the lifetime is 291.6 +/- 1.6 (fs). LEP experiments also provide accurate values for the leptonic branching ratios. The new world average are B-e = 17.793 +/- 0.086(%) and B-mu = 17.333 +/- 0.087(%). No deviation of lepton universality in the charged current is observed with an accuracy of 3 parts per thousand for e - mu and mu - tau separately.

引用

页码：395 / 411

页数：17

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