A Measurement Of The Branching Fraction Of The D(s) Meson Decay Into A Tau And A Neutrino

The purely leptonic decay Ds-->tn is studied in a sample of four million hadronic Z0 decays collected in 1991-1995 with the ALEPH detector at LEP. A linear discriminant analysis is performed to form an optimal set of discriminant variables. The total number of signal events is extracted from an u...

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Autor principal: He, L H
Lenguaje:eng
Publicado: Washington Univ. 2000
Materias:
Particle Physics
Acceso en línea:http://cds.cern.ch/record/498675
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author He, L H
author_facet He, L H
author_sort He, L H
collection CERN
description The purely leptonic decay Ds-->tn is studied in a sample of four million hadronic Z0 decays collected in 1991-1995 with the ALEPH detector at LEP. A linear discriminant analysis is performed to form an optimal set of discriminant variables. The total number of signal events is extracted from an unbinned maximum likelihood fit to the two dimensional discriminant variable distribution. The branching fractions are measured from the two leptonic decay channels of the t lepton to be B(Ds--> tn)e=0 .0586+/-0.0118(stat )+/-0.0209( syst), B(Ds-->tn )m=0.0578+/-0.0085 (stat)+/- 0.0176(syst) . The combined result is B(Ds-->tn )=0.0579+/-0.0076( stat)+/-0.0178( syst). Within the Standard Model, the result corresponds to a D s decay constant of fDs=273+/- 18(stat)+/-42( syst)MeV.
id cern-498675
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2000
publisher Washington Univ.
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spelling cern-4986752019-09-30T06:29:59Zhttp://cds.cern.ch/record/498675engHe, L HA Measurement Of The Branching Fraction Of The D(s) Meson Decay Into A Tau And A NeutrinoParticle PhysicsThe purely leptonic decay Ds-->tn is studied in a sample of four million hadronic Z0 decays collected in 1991-1995 with the ALEPH detector at LEP. A linear discriminant analysis is performed to form an optimal set of discriminant variables. The total number of signal events is extracted from an unbinned maximum likelihood fit to the two dimensional discriminant variable distribution. The branching fractions are measured from the two leptonic decay channels of the t lepton to be B(Ds--> tn)e=0 .0586+/-0.0118(stat )+/-0.0209( syst), B(Ds-->tn )m=0.0578+/-0.0085 (stat)+/- 0.0176(syst) . The combined result is B(Ds-->tn )=0.0579+/-0.0076( stat)+/-0.0178( syst). Within the Standard Model, the result corresponds to a D s decay constant of fDs=273+/- 18(stat)+/-42( syst)MeV.Washington Univ.UMI-99-75992CERN-THESIS-2000-073oai:cds.cern.ch:4986752000
spellingShingle Particle Physics
He, L H
A Measurement Of The Branching Fraction Of The D(s) Meson Decay Into A Tau And A Neutrino
title A Measurement Of The Branching Fraction Of The D(s) Meson Decay Into A Tau And A Neutrino
title_full A Measurement Of The Branching Fraction Of The D(s) Meson Decay Into A Tau And A Neutrino
title_fullStr A Measurement Of The Branching Fraction Of The D(s) Meson Decay Into A Tau And A Neutrino
title_full_unstemmed A Measurement Of The Branching Fraction Of The D(s) Meson Decay Into A Tau And A Neutrino
title_short A Measurement Of The Branching Fraction Of The D(s) Meson Decay Into A Tau And A Neutrino
title_sort measurement of the branching fraction of the d(s) meson decay into a tau and a neutrino
topic Particle Physics
url http://cds.cern.ch/record/498675
work_keys_str_mv AT helh ameasurementofthebranchingfractionofthedsmesondecayintoatauandaneutrino
AT helh measurementofthebranchingfractionofthedsmesondecayintoatauandaneutrino

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