Study of the decay K{sup +}{yields}{pi}{sup +}{nu}{nu} in the momentum region 140<P{sub {pi}}<199 MeV/c
- Institute for High Energy Physics, Protvino, Moscow Region, 142 280 (Russian Federation)
- Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 (United States)
- 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, Vol. 79, Issue 9; Other Information: DOI: 10.1103/PhysRevD.79.092004; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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