Study of the decay K sup + r arrow. pi. sup + e+ e minus

Journal Article · Mon Jan 20 04:00:00 EST 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.68.278· OSTI ID:5083697

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

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1. Brookhaven National Laboratory, Upton, New York 11973 (United States) Fermi National Laboratory, Batavia, Illinois, 60510 (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)

We present results of an experiment in which approximately 500 events of the decay {ital K}{sup +}{r arrow}{pi}{sup +}{ital e+}{ital e{minus}} were observed. We have measured the branching ratio for {ital K}{sub {pi}{ital e}{ital e}}{sup +} to be (2.75{plus minus}0.23{plus minus}0.13){times}10{sup {minus}7} assuming a vector interaction with a form factor of {lambda}=0.105{plus minus}0.035{plus minus}0.015. We have also found the branching ratio times decay probability for {ital K}{sup +}{r arrow}{pi}{sup +}{ital X0}, {ital X}{sup 0}{r arrow}{ital e}{sup +}{ital e{minus}} to be less than 1.5{times}10{sup {minus}8} (99% C.L.) over an {ital X}{sup 0} invariant mass range from 150 to 340 MeV/{ital c}{sup 2}.

• DOE Contract Number: AC02-76CH00016; AC02-76ER03075
• OSTI ID: 5083697
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 68:3; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

662350* -- Decays of Mesons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
BRANCHING RATIO
DATA
DATA ANALYSIS
DECAY
ELECTRONS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
HADRONS
INFORMATION
KAONS
KAONS PLUS
LEPTONS
LIMITING VALUES
MASS SPECTRA
MESONS
MONTE CARLO METHOD
NUMERICAL DATA
PARTICLE DECAY
PIONS
PSEUDOSCALAR MESONS
SEMILEPTONIC DECAY
SPECTRA
STRANGE MESONS
STRANGE PARTICLES
WEAK PARTICLE DECAY