skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Decays of the heavy lepton, tau (1785)

Abstract

The structure of the weak hadronic current coupled to the tau is investigated via some of the hadronic decays of the tau. The vector current coupling is determined by measuring the tau ..-->.. rho ..nu../sub tau/ branching ratio. The axial-vector coupling is determined by measuring the tau ..-->.. ..pi.. ..nu../sub tau/ branching ratio. The Cabibbo structure of the hadronic current is established by observing the decay tau ..-->.. K*(890)..nu../sub tau/ and measuring its branching ratio. The branching ratios for the decays tau ..-->.. e anti ..nu../sub e/..nu../sub tau/ and tau ..-->.. ..mu.. anti ..nu../sub ..mu../..nu../sub tau/ are measured as a normalization for the hadronic decays and as a check on the validity of the measurements. The leptonic branching ratios agree well with previous experiments. From a kinematic fit to the pion energy spectrum in the decay tau ..-->.. ..pi.. ..nu../sub tau/, an upper limit (95% confidence level) of 245 MeV is placed on the tau neutrino mass. From a simultaneous fit of the center of mass energy dependence of the tau production cross section and the pion energy spectrum in the decay tau ..-->.. ..pi.. ..nu../sub tau/, the tau mass is determined to be 1.787 +- .010 GeV/c. All propertiesmore » of the tau measured here are consistent with it being a sequential lepton coupled to the ordinary weak hadronic current.« less

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
OSTI Identifier:
5459518
Report Number(s):
LBL-10801
TRN: 80-009936
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; TAU PARTICLES; WEAK HADRONIC DECAY; BRANCHING RATIO; CABIBBO ANGLE; K-892 RESONANCES; MASS; TAU NEUTRINOS; VECTOR CURRENTS; ALGEBRAIC CURRENTS; BOSONS; CURRENTS; DECAY; ELEMENTARY PARTICLES; FERMIONS; HADRONS; HEAVY LEPTONS; K RESONANCES; LEPTONS; MASSLESS PARTICLES; MESON RESONANCES; MESONS; NEUTRINOS; PARTICLE DECAY; POSTULATED PARTICLES; RESONANCE PARTICLES; STRANGE PARTICLES; VECTOR MESONS; WEAK PARTICLE DECAY; 645102* - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties

Citation Formats

Blocker, C A. Decays of the heavy lepton, tau (1785). United States: N. p., 1980. Web. doi:10.2172/5459518.
Blocker, C A. Decays of the heavy lepton, tau (1785). United States. https://doi.org/10.2172/5459518
Blocker, C A. 1980. "Decays of the heavy lepton, tau (1785)". United States. https://doi.org/10.2172/5459518. https://www.osti.gov/servlets/purl/5459518.
@article{osti_5459518,
title = {Decays of the heavy lepton, tau (1785)},
author = {Blocker, C A},
abstractNote = {The structure of the weak hadronic current coupled to the tau is investigated via some of the hadronic decays of the tau. The vector current coupling is determined by measuring the tau ..-->.. rho ..nu../sub tau/ branching ratio. The axial-vector coupling is determined by measuring the tau ..-->.. ..pi.. ..nu../sub tau/ branching ratio. The Cabibbo structure of the hadronic current is established by observing the decay tau ..-->.. K*(890)..nu../sub tau/ and measuring its branching ratio. The branching ratios for the decays tau ..-->.. e anti ..nu../sub e/..nu../sub tau/ and tau ..-->.. ..mu.. anti ..nu../sub ..mu../..nu../sub tau/ are measured as a normalization for the hadronic decays and as a check on the validity of the measurements. The leptonic branching ratios agree well with previous experiments. From a kinematic fit to the pion energy spectrum in the decay tau ..-->.. ..pi.. ..nu../sub tau/, an upper limit (95% confidence level) of 245 MeV is placed on the tau neutrino mass. From a simultaneous fit of the center of mass energy dependence of the tau production cross section and the pion energy spectrum in the decay tau ..-->.. ..pi.. ..nu../sub tau/, the tau mass is determined to be 1.787 +- .010 GeV/c. All properties of the tau measured here are consistent with it being a sequential lepton coupled to the ordinary weak hadronic current.},
doi = {10.2172/5459518},
url = {https://www.osti.gov/biblio/5459518}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 01 00:00:00 EST 1980},
month = {Tue Apr 01 00:00:00 EST 1980}
}