Measurement of D{sub s}{yields}{tau}{nu}{sub {tau}} and search for B{yields}{tau}{nu}{sub {tau}} with the L3 detector

Journal Article · Fri May 29 04:00:00 EDT 1998 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.56075· OSTI ID:21199086

Raven, Gerhard ^[1]

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1. University of California, San Diego, La Jolla, California 92093 (United States)

The purely leptonic decays of heavy mesons D{sub s}{yields}{tau}{nu}{sub {tau}} and B{yields}{tau}{nu}{sub {tau}} are studied in a sample of 1.5M Z{yields}qq-bar({gamma}) events collected in 1994 by the L3 detector at LEP. A signal for the decay chain D{sub s}{sup 0}{yields}{gamma}D{sub s}, D{sub s}{yields}{tau}{nu}{sub {tau}}, {tau}{yields}l{nu}{sub l}{nu}{sub {tau}} is observed in the invariant mass distribution M({gamma}D{sub s}). From this signal, a branching ration of B(D{sub s}{yields}{tau}{nu}{sub {tau}})=0.074{+-}0.028(stat){+-}0.016(syst){+-}0.018(norm) is derived, corresponding to a decay constant f{sub D{sub s}}=309{+-}58(stat){+-}33(syst){+-}38(norm) GeV. No signal is observed for the decay B{yields}{tau}{nu}{sub {tau}}, and an upper limit of B(B{yields}{tau}{nu}{sub {tau}})<5.7x10{sup -4} at 90% CL is set. These results have been published in [1].

• OSTI ID: 21199086
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 432; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
D MESONS
D S MESONS
ELECTRON-POSITRON INTERACTIONS
GEV RANGE
LEP STORAGE RINGS
LEPTONIC DECAY
LIMITING VALUES
MASS DISTRIBUTION
PARTICLE DECAY
PARTICLE IDENTIFICATION
PARTICLE PRODUCTION
PHOTONS
S MATRIX
TAU NEUTRINOS
TAU PARTICLES
Z NEUTRAL BOSONS