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

Abstract

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.

Submitted to Phys.Rev. D

References in corpus (7)

• Secluded WIMP Dark Matter
• U-boson production in e+e- annihilations, psi and Upsilon decays, and Light Dark Matter
• Improved estimates of rare K decay matrix-elements from Kl3 decays
• Constraints on New Physics in MFV models: a model-independent analysis of Delta F=1 processes
• Electroweak Corrections to the Charm Quark Contribution to K+ -> pi+ nu nu-bar
• Search for the Decay $K_L^0\to {\pi }^0\nu \bar{\nu }$
• Non-standard neutrino interactions in K^{+}\toπ^{+}ν\barν and D^{+}\toπ^{+}ν\barν decays

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