Improved limit on the branching ratio of K sup + r arrow. pi. sup +. mu. sup + e sup minus

Journal Article · Mon Jan 08 04:00:00 EST 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.64.165· OSTI ID:6990097

Lee, A M; Alliegro, C; Campagnari, C; Chaloupka, V; Cooper, P S; Egger, J; Gordon, H A; Hadley, N J; Herold, W D; Jagel, E A; Kaspar, H; 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 (US) Fermi National Laboratory, Batavia, Illinois 60510 Paul Scherrer Institute, Swiss Institute for Nuclear Research, CH-5234 Villigen, Switzerland Department of Physics, University of Washington, Seattle, Washington 98195 Department of Physics, Yale University, New Haven, Connecticut 06511

A search for the lepton-flavor number-violating decay {ital K}{sup +}{r arrow}{pi}{sup +}{mu}{sup +}e{sup {minus}} has been conducted at the Brookhaven Alternating Gradient Synchrotron. No candidates have been found which would be consistent with this decay mode. An upper limit on the branching ratio is placed at 2.6{times}10{sup {minus}10}, which can be combined with our previous result to yield an upper limit of 2.1{times}10{sup {minus}10} at the 90% confidence level. A limit on the branching ratio for {pi}{sup 0}{r arrow}{mu}{sup +}e{sup {minus}} of 1.6{times}10{sup {minus}8} (90% C.L.) is also established.

• DOE Contract Number: AC02-76CH00016; AC02-76ER03075
• OSTI ID: 6990097
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 64:2; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
645103 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BOSONS
BRANCHING RATIO
BROOKHAVEN AGS
CYCLIC ACCELERATORS
DATA
DATA ANALYSIS
DECAY
ELECTRONS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
HADRONS
INFORMATION
KAONS
KAONS PLUS
LEPTONS
LIMITING VALUES
MEASURING METHODS
MESONS
MONTE CARLO METHOD
MUONS
NUMERICAL DATA
PARTICLE DECAY
PARTICLE IDENTIFICATION
PIONS
PIONS PLUS
PSEUDOSCALAR MESONS
SEMILEPTONIC DECAY
STRANGE MESONS
STRANGE PARTICLES
SYNCHROTRONS
WEAK PARTICLE DECAY