Study of the decay K{sup +}{yields}{pi}{sup +}{nu}{nu} in the momentum region 140<P{sub {pi}}<199 MeV/c

Journal Article · Fri May 01 04:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.092004· OSTI ID:21308393

Artamonov, A V; Kozhevnikov, A P; Landsberg, L G; Mukhin, V A; Obraztsov, V F; Patalakha, D I; Petrenko, S V; Vavilov, D V ^[1]; Bassalleck, B; Lewis, B ^[2]; Bhuyan, B; Chiang, I -H; Diwan, M V; Frank, J S; Jaffe, D E; Kettell, S H; Li, K K; Littenberg, L S; Redlinger, G; Strand, R C ^[3]

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1. Institute for High Energy Physics, Protvino, Moscow Region, 142 280 (Russian Federation)
2. Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 (United States)
3. Brookhaven National Laboratory, Upton, New York 11973 (United States)

Experiment E949 at Brookhaven National Laboratory has observed three new events consistent with the decay K{sup +}{yields}{pi}{sup +}{nu}{nu} in the pion momentum region 140<P{sub {pi}}<199 MeV/c in an exposure of 1.71x10{sup 12} stopped kaons with an estimated total background of 0.93{+-}0.17(stat){sub -0.24}{sup +0.32}(syst) events. This brings the total number of observed K{sup +}{yields}{pi}{sup +}{nu}{nu} events to seven. Combining this observation with previous results, assuming the pion spectrum predicted by the standard model, results in a branching ratio of B(K{sup +}{yields}{pi}{sup +}{nu}{nu})=(1.73{sub -1.05}{sup +1.15})x10{sup -10}. An interpretation of the results for alternative models of the decay K{sup +}{yields}{pi}{sup +}+nothing is also presented.

• OSTI ID: 21308393
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 79; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BNL
BRANCHING RATIO
KAONS PLUS
MEV RANGE
NEUTRINOS
PARTICLE DECAY
PIONS PLUS
SPECTRA
STANDARD MODEL