E949 Collaboration
Published 2008-08-18, updated 2008-11-02Version 2
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.
Comments: To be published in Physical Review Letters
Journal: Phys.Rev.Lett.101:191802,2008
Measurement of the $K^+\toπ^+ν\barν$ Branching Ratio
Measurement of the $π\rightarrow \mbox{e} ν$ branching ratio
Measurement of the branching ratio of $\bar{B} \to D^{(\ast)} τ^- \barν_τ$ relative to $\bar{B} \to D^{(\ast)} \ell^- \barν_\ell$ decays with hadronic tagging at Belle
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