tau. - e and. tau. -. mu. universality from. tau. r arrow. pi. nu. decays

Journal Article · Sat Aug 01 04:00:00 EDT 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.46.1064· OSTI ID:7287006

Bryman, D A ^[1]

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1. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 (Canada)

It is pointed out that a comparison of measurements of {tau}{r arrow}{pi}{nu} decays with {pi}{r arrow}{mu}{nu} and {pi}{r arrow}{ital e}{nu} decays can be used to obtain accurate measures of {tau}-{mu} and {tau}-{ital e} universality. From current data on these processes it is found that the ratios of the electroweak charged-current couplings of the {tau} to those of the muon and electron are {ital g}{sub {tau}}/{ital g}{sub {mu}}=0.983{plus minus}0.025 and {ital g}{sub {tau}}/{ital g}{sub {ital e}}=0.986{plus minus}0.026, in agreement with the hypothesis of universality.

• OSTI ID: 7287006
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 46:3; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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BRANCHING RATIO
CHARGED-CURRENT INTERACTIONS
COUPLING CONSTANTS
DECAY
ELECTRON NEUTRINOS
ELECTRONS
ELEMENTARY PARTICLES
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PIONS
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STANDARD MODEL
TAU NEUTRINOS
TAU PARTICLES
UNIFIED GAUGE MODELS
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WEINBERG-SALAM GAUGE MODEL