Study of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c

Details Study of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c Study of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c

2009-02-28

arxiv.org/abs/0903.0030v1

Phys.Rev.D79:092004,2009

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to Phys.Rev. D

Scientific paper

10.1103/PhysRevD.79.092004

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 < P_pi < 199 MeV/c in an exposure of 1.71e12 stopped kaons with an estimated total background of 0.93+-0.17(stat.)+0.32-0.24(syst.) events. This brings the total number of observed K+ => 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.

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