An OPAL measurement of the $\tau^{-} \to e^{-}\nu_{e}\nu_{\tau}$ branching ratio

The branching ratio for the decay tau /sup -/ to e/sup -/ nu /sub e/ nu /sub tau / has been measured using data collected by the OPAL experiment at LEP. In total 33073 tau /sup -/ to e/sup -/ nu /sub e/ nu /sub tau / candidates were identified from a sample of 186197 selected tau decays, giving a br...

Descripción completa

Detalles Bibliográficos
Autor principal: Robertson, S
Lenguaje:eng
Publicado: 1999
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1016/S0920-5632(99)00437-5
http://cds.cern.ch/record/409300
_version_ 1780894510442610688
author Robertson, S
author_facet Robertson, S
author_sort Robertson, S
collection CERN
description The branching ratio for the decay tau /sup -/ to e/sup -/ nu /sub e/ nu /sub tau / has been measured using data collected by the OPAL experiment at LEP. In total 33073 tau /sup -/ to e/sup -/ nu /sub e/ nu /sub tau / candidates were identified from a sample of 186197 selected tau decays, giving a branching ratio of B/sub e/= (17.81+or-0.09 (stat)+or-0.06 (syst))This result is combined with other electroweak measurements to test e- mu and mu - tau universality in charged-current weak interactions at the level of 0.5Additionally, a value of the strong coupling constant alpha /sub s/(m/sub tau //sup 2/) has been extracted from B/sub e/ and evolved to the Z/sup 0/ mass scale to give alpha /sub s/(m/sub Z//sup 2/)=0.1204+or-0.0011 (exp)/sub -0.0019//sup +0.0021/ (theory). (16 refs).
id cern-409300
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1999
record_format invenio
spelling cern-4093002019-09-30T06:29:59Zdoi:10.1016/S0920-5632(99)00437-5http://cds.cern.ch/record/409300engRobertson, SAn OPAL measurement of the $\tau^{-} \to e^{-}\nu_{e}\nu_{\tau}$ branching ratioParticle Physics - ExperimentThe branching ratio for the decay tau /sup -/ to e/sup -/ nu /sub e/ nu /sub tau / has been measured using data collected by the OPAL experiment at LEP. In total 33073 tau /sup -/ to e/sup -/ nu /sub e/ nu /sub tau / candidates were identified from a sample of 186197 selected tau decays, giving a branching ratio of B/sub e/= (17.81+or-0.09 (stat)+or-0.06 (syst))This result is combined with other electroweak measurements to test e- mu and mu - tau universality in charged-current weak interactions at the level of 0.5Additionally, a value of the strong coupling constant alpha /sub s/(m/sub tau //sup 2/) has been extracted from B/sub e/ and evolved to the Z/sup 0/ mass scale to give alpha /sub s/(m/sub Z//sup 2/)=0.1204+or-0.0011 (exp)/sub -0.0019//sup +0.0021/ (theory). (16 refs).oai:cds.cern.ch:4093001999
spellingShingle Particle Physics - Experiment
Robertson, S
An OPAL measurement of the $\tau^{-} \to e^{-}\nu_{e}\nu_{\tau}$ branching ratio
title An OPAL measurement of the $\tau^{-} \to e^{-}\nu_{e}\nu_{\tau}$ branching ratio
title_full An OPAL measurement of the $\tau^{-} \to e^{-}\nu_{e}\nu_{\tau}$ branching ratio
title_fullStr An OPAL measurement of the $\tau^{-} \to e^{-}\nu_{e}\nu_{\tau}$ branching ratio
title_full_unstemmed An OPAL measurement of the $\tau^{-} \to e^{-}\nu_{e}\nu_{\tau}$ branching ratio
title_short An OPAL measurement of the $\tau^{-} \to e^{-}\nu_{e}\nu_{\tau}$ branching ratio
title_sort opal measurement of the $\tau^{-} \to e^{-}\nu_{e}\nu_{\tau}$ branching ratio
topic Particle Physics - Experiment
url https://dx.doi.org/10.1016/S0920-5632(99)00437-5
http://cds.cern.ch/record/409300
work_keys_str_mv AT robertsons anopalmeasurementofthetautoenuenutaubranchingratio
AT robertsons opalmeasurementofthetautoenuenutaubranchingratio

Ejemplares similares