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

Journal Article · Mon May 18 00:00:00 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), Vol. 68:20; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Pa
PIONS PLUS
LEPTONIC DECAY
BRANCHING RATIO
EXPERIMENTAL DATA
RADIATIVE CORRECTIONS
STANDARD MODEL
BASIC INTERACTIONS
BOSONS
CORRECTIONS
DATA
DECAY
ELEMENTARY PARTICLES
HADRONS
INFORMATION
INTERACTIONS
MATHEMATICAL MODELS
MESONS
NUMERICAL DATA
PARTICLE DECAY
PARTICLE MODELS
PIONS
PSEUDOSCALAR MESONS
UNIFIED GAUGE MODELS
WEAK INTERACTIONS
WEAK PARTICLE DECAY
662350* - Decays of Mesons- (1992-)
662210 - Specific Theories & Interaction Models
Particle Systematics- Unified Theories & Models- (1992-)