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Upper bound on the tau-neutrino mass from the previously unobserved decay mode tau. -->. KK. pi nu. /sub tau/

Journal Article · · Phys. Rev. Lett.; (United States)
; ; ; ; ; ; ; ; ;
We report a measurement of the branching ratios for two decay modes of the tau lepton: R/sub B/(tau/sup + -/..-->..K/sup + -/K/sup - +/..pi../sup + -/..nu../sub tau/) = (0.22/sub -0.11//sup +0.17/)% and R/sub B/(tau/sup + -/..-->..k/sup + -/..pi../sup - +/..pi../sup + -/(..pi../sup 0/ )..nu../sub tau/) = (0.22/sub -0.13//sup +0.16/)%. The separation of these channels is accomplished in the DELCO detector by use of a gas Cerenkov counter to identify fast kaons. The invariant-mass distribution of the k/sup + -/K/sup - +/..pi../sup + -/ system has been used to set an upper bound on the tau neutrino mass of 157 MeV at 95% confidence level.
Research Organization:
California Institute of Technology, Pasadena, California 91125 and Stanford Linear Accelerator Center and Physics Department, Stanford University, Stanford, California 94305
DOE Contract Number:
AC03-76SF00515; AC03-81ER40050
OSTI ID:
5921700
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 54:7; ISSN PRLTA
Country of Publication:
United States
Language:
English

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Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BRANCHING RATIO
DATA
DECAY
DISTRIBUTION
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
HADRONS
HEAVY LEPTONS
INFORMATION
KAONS
LEPTONS
LIMITING VALUES
MASS
MASS DISTRIBUTION
MASSLESS PARTICLES
MESONS
NEUTRINOS
NUMERICAL DATA
PARTICLE DECAY
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
SEMILEPTONIC DECAY
SPATIAL DISTRIBUTION
STRANGE PARTICLES
TAU NEUTRINOS
TAU PARTICLES
WEAK PARTICLE DECAY