Measurement of the. pi. sup + r arrow e sup +. nu. branching ratio

Journal Article · Mon May 18 04:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.68.3000· OSTI ID:7044159

Britton, D I; Ahmad, S; Bryman, D A; Burnham, R A; Clifford, E T.H.; Kitching, P; Kuno, Y; Macdonald, J A; Numao, T; Olin, A; Poutissou, J ^[1]; Dixit, M S ^[2]

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1. TRIUMF, Vancouver, British Columbia, V6T2A3 (Canada)
2. Center for Research in Particle Physics, Carleton University, Ottawa, Ontario, K1S5B6 (Canada)

A new measurement of the {pi}{sup +}{r arrow}{ital e}{sup +}{nu} branching ratio gives {ital R}{sub {pi}{ital e}{nu}}={Gamma}({pi}{r arrow}{ital e}{nu}+{pi}{r arrow}{ital e}{nu}{gamma})/{Gamma} ({pi}{r arrow}{mu}{nu}+{pi}{r arrow}{mu}{nu}{gamma}) =(1.2265{plus minus}0.0034(stat){plus minus}0.0044(sys)){times}10{sup {minus}4}. This result is in agreement with standard model calculations and confirms the hypothesis of electron-muon universality at the 0.2% level.

• OSTI ID: 7044159
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 68:20; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

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662350* -- Decays of Mesons-- (1992-)
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BASIC INTERACTIONS
BOSONS
BRANCHING RATIO
CORRECTIONS
DATA
DECAY
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
HADRONS
INFORMATION
INTERACTIONS
LEPTONIC DECAY
MATHEMATICAL MODELS
MESONS
NUMERICAL DATA
PARTICLE DECAY
PARTICLE MODELS
PIONS
PIONS PLUS
PSEUDOSCALAR MESONS
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Particle Systematics-- Unified Theories & Models-- (1992-)
RADIATIVE CORRECTIONS
STANDARD MODEL
UNIFIED GAUGE MODELS
WEAK INTERACTIONS
WEAK PARTICLE DECAY