Journal article
Measurement of the leptonic branching ratios of the τ lepton
R Akers, G Alexander, J Allison, K Ametewee, KJ Anderson, S Arcelli, S Asai, D Axen, G Azuelos, AH Ball, E Barberio, RJ Barlow, R Bartoldus, JR Batley, G Beaudoin, A Beck, GA Beck, C Beeston, T Behnke, KW Bell Show all
European Physical Journal C | SPRINGER VERLAG | Published : 1995
DOI: 10.1007/BF01579629
Abstract
The leptonic branching ratios of the tau lepton have been determined from data collected by the OPAL detector in 1991 and 1992. From a sample of 27196 e+e-→τ+τ- candidates we find 7322 {Mathematical expression} and 7941 {Mathematical expression} candidates. Using efficiency and background estimates determined from a study of Monte Carlo events and control samples of data, the branching ratios {Mathematical expression}=(18.14±0.20±0.28)% and {Mathematical expression}=(17.48±0.18±0.23)% have been obtained. These new results have been combined with the published results for the 1990 OPAL data to yield the following branching ratios for data taken between 1990 and 1992: {Mathematical expression}..
View full abstract