Study of the decay K+ => pi+,nu,nubar in the momentum region 140

By A. Artamonov, B. Bassalleck, B. Bhuyan, E. Blackmore, D. Bryman, Shaomin Chen, I. Chiang, I. Christidi, P. Cooper, M. Diwan and 52 more. 2009

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Experiment E949 at Brookhaven National Laboratory has observed three new events consistent with the decay K+ => pi+,nu,nubar in the pion momentum region 140 pi+,nu,nubar events to seven. Combining this observation with previous results, assuming the pion spectrum predicted by the standard model, results in a branching ratio of (1.73+1.15-1.05)e-10. An interpretation of the results for alternative models of the decay K^ => pi+,nothing is also presented.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/813b8c3e9c98d90a51fe9cd97d9ac1cb694443a3