New measurement of the K+ => pi+,nu,nubar branching ratio

Details New measurement of the K+ => pi+,nu,nubar branching ratio New measurement of the K+ => pi+,nu,nubar branching ratio

2008-08-18

arxiv.org/abs/0808.2459v2

Phys.Rev.Lett.101:191802,2008

Physics

High Energy Physics

High Energy Physics - Experiment

To be published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.101.191802

Three events for the decay K+ => pi+,nu,nubar have been observed in the pion momentum region below the K+ => pi+,pi0 peak, 140 < P_pi < 199 MeV/c, with an estimated background of 0.93+-0.17(stat.)+0.32-0.24(syst.) events. Combining this observation with previously reported results yields a branching ratio of B(K+ => pi+,nu,nubar) = (1.73+1.15-1.05)e-10 consistent with the standard model prediction.

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