Improved sensitivity in a search for the rare decay [ital K][sub [ital L]][sup 0][r arrow][ital e][sup +][ital e[minus]]

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

DOI:https://doi.org/10.1103/PhysRevLett.71.3910· OSTI ID:5321142

Arisaka, K; Auerbach, L B; Axelrod, S; Belz, J; Biery, K A; Buchholz, P; Chapman, M D; Cousins, R D; Diwan, M V; Eckhause, M; Ginkel, J F; Guss, C; Hancock, A D; Heinson, A P; Highland, V L; Hoffmann, G W; Horvath, J; Irwin, G M; Joyce, D; Kaarsberg, T ; Kane, J R; Kenney, C J; Kettell, S H; Kinnison, W W; Knibbe, P; Konigsberg, J; Kuang, Y; Lang, K; Lee, D M; Margulies, J; Mathiazhagan, C; McFarlane, W K; McKee, R J; Melese, P; Milner, E C; Molzon, W R; Ouimette, D A; Riley, P J; Ritchie, J L; Rubin, P; Sanders, G H; Schwartz, A J; Sivertz, M; Slater, W E; Urheim, J; Vulcan, W F; Wagner, D L; Welsh, R E; Whyley, R J; Winter, R G; Witkowski, M T; Wojcicki, S G; Yamashita, A; Ziock, H J ^[1]

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1. University of California, Los Angeles, California 90024 (United States) Temple University, Philadelphia, Pennsylvania 19122 (United States) Stanford University, Stanford, California 94309 (United States) College of William and Mary, Williamsburg, Vir

In a search for the decay [ital K][sub [ital L]][sup 0][r arrow][ital e][sup +][ital e[minus]], no candidates have been observed. We determine the sensitivity from the detected number of [ital CP]-violating [ital K][sub [ital L]][sup 0][r arrow][pi][sup +][pi][sup [minus]] decays and place a 90% confidence level upper limit on the branching ratio of [ital B]([ital K][sub [ital L]][sup 0][r arrow][ital e][sup +][ital e[minus]],[vert bar][ital M][sub [ital K]][minus][ital M][sub [ital e][ital e]][vert bar][lt]6 MeV/[ital c][sup 2])[le]4.1[times]10[sup [minus]11]. This result is a significant improvement over previous measurements, although still above the standard model prediction of 3[times]10[sup [minus]12].

• OSTI ID: 5321142
• Journal Information: Physical Review Letters; (United States), Vol. 71:24; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Pa
KAONS NEUTRAL LONG-LIVED
PARTICLE DECAY
SENSITIVITY
BRANCHING RATIO
CP INVARIANCE
ELECTRONS
PHOTONS
PIONS MINUS
PIONS PLUS
POSITRONS
VIOLATIONS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BOSONS
DECAY
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INVARIANCE PRINCIPLES
KAONS
KAONS NEUTRAL
LEPTONS
MASSLESS PARTICLES
MATTER
MESONS
PIONS
PSEUDOSCALAR MESONS
STRANGE MESONS
STRANGE PARTICLES
662350* - Decays of Mesons- (1992-)
662210 - Specific Theories & Interaction Models
Particle Systematics- Unified Theories & Models- (1992-)