Evidence for the Decay K{sup +}{r_arrow}{pi}{sup +}{nu}{bar v}

Journal Article · Mon Sep 01 00:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.79.2204· OSTI ID:542659

Adler, S; Atiya, M S; Chiang, I; Diwan, M V; Frank, J S; Haggerty, J S; Kettell, S H; Kycia, T F; Li, K K; Littenberg, L S; Ng, C; Sambamurti, A; Stevens, A; Strand, R C; Witzig, C ^[1]; Komatsubara, T K; Kuriki, M; Muramatsu, N; Sugimoto, S ^[2]; Inagaki, T ; Kabe, S; Kobayashi, M; Kuno, Y; Sato, T; Shinkawa, T; Yoshimura, Y ^[3]; Kishi, Y; Nakano, T ^[4]; Ardebili, M; Bazarko, A O; Convery, M R; Ito, M M; Marlow, D R; McPherson, R A; Meyers, P D; Shoemaker, F C; Smith, A J; Stone, J R ^[5]; Aoki, M; Blackmore, E W; Bergbusch, P C; Bryman, D A; Konaka, A; Macdonald, J A; Mildenberger, J; Numao, T; Padley, P; Poutissou, J; Poutissou, R; Redlinger, G; Roy, J; Turcot, A S ^[6]; Kitching, P; Soluk, R ^[7]

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1. Brookhaven National Laboratory, Upton, New York 11973 (United States)
2. High Energy Accelerator Research Organization (KEK), Tanashi-branch, Midoricho, Tanashi, Tokyo 188 (Japan)
3. High Energy Accelerator Research Organization (KEK), Oho, Tsukuba, Ibaraki 305 (Japan)
4. Department of Physics, Osaka University, Machikaneyama, Toyonaka, Osaka 560 (Japan)
5. Joseph Henry Laboratories, Princeton University, Princeton, New Jersey 08544 (United States)
6. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada, V6T 2A3 (CANADA)
7. Centre for Subatomic Research, University of Alberta, Edmonton, Alberta, Canada, T6G 2N5 (CANADA)

An event consistent with the signature expected for the rare kaon decay K{sup +}{r_arrow}{pi}{sup +}{nu}{bar {nu}} has been observed. In the pion momentum region examined, 211{lt}P{lt}230 MeV/c , the backgrounds are estimated to contribute 0.08{plus_minus}0.03 events. If the event is due to K{sup +}{r_arrow}{pi}{sup +}{nu}{bar {nu}} , the branching ratio is 4.2{sup +9.7}{sub {minus}3.5}{times}10{sup {minus}10} . {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• DOE Contract Number: AC02-76CH00016; FG02-91ER40671; W-7405-ENG-36
• OSTI ID: 542659
• Journal Information: Physical Review Letters, Vol. 79, Issue 12; Other Information: PBD: Sep 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
KAONS PLUS
WEAK HADRONIC DECAY
PROTONS
NEUTRONS
BRANCHING RATIO
KOBAYASHI-MASKAWA MATRIX
MATRIX ELEMENTS
SENSITIVITY
ISOSPIN