Limit on the branching ratio of [ital K][sub [ital L]][r arrow][pi][sup 0][ital e+][ital e[minus]]

Journal Article · Mon Dec 13 04:00:00 EST 1993 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.71.3918· OSTI ID:5321172

Harris, D A; Briere, R A; Cheu, E; Makoff, G; McFarland, K S; Roodman, A; Schwingenheuer, B; Somalwar, S V; Wah, Y W; Winstein, B; Winston, R ^[1]; Arisaka, K; Roberts, D; Slater, W; Weaver, M ^[2]; Barker, A R ^[3]; Swallow, E C ^[4]; Bock, G J; Coleman, R; Crisler, M ; Enagonio, J; Ford, R; Hsiung, Y B; Jensen, D A; Ramberg, E; Tschirhart, R ^[5]; Collins, E M; Gollin, G D ^[6]; Nakaya, T; Yamanaka, T ^[7]

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1. The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637 (United States)
2. University of California at Los Angeles, Los Angeles, California 90024 (United States)
3. University of Colorado, Boulder, Colorado 80309 (United States)
4. Elmhurst College, Elmhurst, Illinois 60126 (United States) The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637 (United States)
5. Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
6. University of Illinois, Urbana, Illinois 61801 (United States)
7. Department of Physics, Osaka Univ

We report the results of a search for the decay [ital K][sub [ital L]][r arrow][pi][sup 0][ital e+][ital e[minus]] conducted by E799 at Fermilab. The largest contribution to this decay mode is expected to be [ital CP] violating. Observations of this decay could either confirm the standard model mechanisms for [ital CP] violation or point to physics beyond the standard model. No such events were seen in our search. The 90% confidence level upper limit is determined to be [ital B]([ital K][sub [ital L]][r arrow][pi][sup 0][ital e+][ital e[minus]])[lt]4.3[times]10[sup [minus]9].

• OSTI ID: 5321172
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 71:24; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

662120 -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662350* -- Decays of Mesons-- (1992-)
662420 -- Properties of Mesons & Meson Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BOSONS
BRANCHING RATIO
CP INVARIANCE
DECAY
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INVARIANCE PRINCIPLES
KAONS
KAONS NEUTRAL
KAONS NEUTRAL LONG-LIVED
LEPTONS
MATTER
MESONS
PARTICLE DECAY
PIONS
PIONS NEUTRAL
POSITRONS
PSEUDOSCALAR MESONS
SEMILEPTONIC DECAY
STRANGE MESONS
STRANGE PARTICLES
VIOLATIONS
WEAK PARTICLE DECAY