Measurement of the absolute branching ratio of the K+ -> pi+ pi0 (gamma) decay with the KLOE detector

Details Measurement of the absolute branching ratio of the K+ -> pi+ pi0 (gamma) decay with the KLOE detector Measurement of the absolute branching ratio of the K+ -> pi+ pi0 (gamma) decay with the KLOE detector

2008-04-29

arxiv.org/abs/0804.4577v2

Phys.Lett.B666:305-310,2008

Physics

High Energy Physics

High Energy Physics - Experiment

14 pages, 2 figures; changed content

Scientific paper

10.1016/j.physletb.2008.07.070

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}.

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