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

• Published in: Physical review letters 1993-12, Vol.71:24
• Main Authors: 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., Arisaka, K., Roberts, D., Slater, W., Weaver, M., Barker, A.R., Swallow, E.C., Bock, G.J., Coleman, R., Crisler, M., Enagonio, J., Ford, R., Hsiung, Y.B., Jensen, D.A., Ramberg, E., Tschirhart, R., Collins, E.M., Gollin, G.D., Nakaya, T., Yamanaka, T.
• Format: Article
• Language: English
• Subjects: 662120 > General Theory of Particles & Fields-- Symmetry, Conservation Laws, Currents & Their Properties-- (1992-); 662420 > Properties of Mesons & Meson Resonances-- (1992-); ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; BOSONS; BRANCHING RATIO; CP INVARIANCE; DECAY; ELEMENTARY PARTICLES; FERMIONS; HADRONS; INVARIANCE PRINCIPLES; KAONS; KAONS NEUTRAL; KAONS NEUTRAL LONG-LIVED; LEPTONS; MATHEMATICAL MODELS; MATTER; MESONS; MUONS; MUONS PLUS; PARTICLE DECAY; PARTICLE MODELS; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PIONS; PIONS NEUTRAL; PSEUDOSCALAR MESONS; SEMILEPTONIC DECAY; STANDARD MODEL; STRANGE MESONS; STRANGE PARTICLES; UNIFIED GAUGE MODELS; VIOLATIONS; WEAK PARTICLE DECAY 662350 > Decays of Mesons-- (1992-)
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.71.3914

We report the results of a search for the decay [ital K][sub [ital L]][r arrow][pi][sup 0][mu][sup +][mu][sup [minus]] conducted by E799 at Fermilab. This decay mode is expected to have significant [ital CP][minus]violating contributions and a direct measurement could either confirm the standard model mechanisms for [ital CP]-violation or point to physics beyond the standard model. No such events were seen. The 90% confidence level upper limit is determined to be [ital B]([ital K][sub [ital L]][r arrow][pi][sup 0][mu][sup +][mu][sup [minus]])[lt]5.1[times]10[sup [minus]9].