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Measurement of the absolute branching ratio of the K+→π+π0(γ) decay with the KLOE detector
2008
Physics Letters B
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We have measured the absolute branching ratio of the K+ -> pi+ pi0 (gamma) decay, using about 20 million tagged K+ mesons collected with the KLOE detector at DAFNE, the Frascati phi-factory. Signal counts are obtained from the fit of the distribution of the momentum of the charged decay particle in the kaon rest frame. The result, inclusive of final-state radiation, is BR(K+ -> pi+ pi0 (gamma))=0.2065+/-0.0005_stat+/- 0.0008_syst.
doi:10.1016/j.physletb.2008.07.070
fatcat:js5xo3z6z5ea7c5jqoh6f2gyru