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Measurement of the branching fraction for tau/sup -/. -->. 5. pi. /sup + -/(. pi. /sup 0/). nu. /sub tau/ and an upper limit on the. nu. /sub tau/ mass

Journal Article · · Phys. Rev. Lett.; (United States)
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The branching fraction for tau/sup -/..-->..5..pi../sup + -/(..pi../sup 0/)..nu../sub tau/ is measured from data accumulated with the Mark II detector at PEP. Four events are observed with an estimated hadronic background of (0.03/sub -0.02//sup +0.04/) events and a background from tau/sup -/..-->..e..pi../sup + -/..pi../sup 0/..nu../sub tau/ of (0.05/sub -0.04//sup +0.07/) events. This results in a measured branching fraction of (0.16 +- 0.08 +- 0.04)%. The candidate events are used to establish an upper limit of 125 MeV/c/sup 2/ on the ..nu../sub tau/ mass at the 95% confidence level.
Research Organization:
Stanford Linear Accelerator Center, Stanford University, Stanford, California 94305; Lawrence Berkeley Laboratory and Department of Physics, University of California, Berkeley, California 94720; and Department of Physics, Harvard University, Cambridge, Massachusetts 02138
DOE Contract Number:
AC03-76SF00515; AC03-76SF00098; AC02-76ER03064
OSTI ID:
5480731
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 54:23; 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
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
HADRONS
HEAVY LEPTONS
INFORMATION
LEPTONS
MASS
MASSLESS PARTICLES
MESONS
MONTE CARLO METHOD
NEUTRINOS
NUMERICAL DATA
PARTICLE DECAY
PEP STORAGE RINGS
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
SEMILEPTONIC DECAY
STORAGE RINGS
TAU NEUTRINOS
TAU PARTICLES
WEAK PARTICLE DECAY