Determination of the branching ratio of the decay [pi][sup 0][r arrow][ital e][sup +][ital e[minus]]

Journal Article · Mon Jul 05 04:00:00 EDT 1993 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.71.27· OSTI ID:6330482

Deshpande, A; Alliegro, C; Chaloupka, V; Egger, J; Gordon, H A; Hadley, N J; Herold, W D; Kaspar, H; Lee, A M; Lazarus, D M; Lubatti, H J; Ma, H; Rehak, P; Skukla, A; Zeller, M E; Zhao, T ^[1]

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1. Brookhaven National Laboratory, Upton, New York 11973 (United States) University of Maryland, College Park, Maryland 20742 (United States) Paul Scherrer Institute (Swiss Institute for Nuclear Research), CH-5234 Villigen (Switzerland) Department of Physics, University of Washington, Seattle, Washington 98195 (United States) Department of Physics, Yale University, New Haven, Connecticut 06511 (United States)

Employing the decay chain [ital K][sup +][r arrow][pi][sup +][pi][sup 0], [pi][sup 0][r arrow][ital e][sup +][ital e[minus]] we have observed the decay [pi][sup 0][r arrow][ital e][sup +][ital e[minus]]. With a signal sample of [approx]21 events we measure the branching ratio for [pi][sup 0][r arrow][ital e][sup +][ital e[minus]] to be (6.9[plus minus]2.3[plus minus]0.6)[times]10[sup [minus]8], normalized to the decay [ital K][sup +][r arrow][pi][sup +][pi][sup 0], [pi][sup 0][r arrow][ital e][sup +][ital e[minus]][gamma]. This result is consistent with the unitarity lower bound and the published 90% confidence level upper limit of 13[times]10[sup [minus]8].

• DOE Contract Number: AC02-76CH00016; AC02-76ER03075; AC05-76ER02504
• OSTI ID: 6330482
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 71:1; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BOSONS
BRANCHING RATIO
DECAY
ELECTROMAGNETIC PARTICLE DECAY
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INTERACTIONS
LEPTONS
MATTER
MESONS
PAIR PRODUCTION
PARTICLE DECAY
PARTICLE PRODUCTION
PIONS
PIONS NEUTRAL
POSITRONS
PSEUDOSCALAR MESONS
UNITARITY