Measurement of the absolute branching ratio of the K+ -> pi+ pi0 (gamma) decay with the KLOE detector
F. Ambrosino, A. Antonelli, M. Antonelli, F. Archilli, C. Bacci, P., Beltrame, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, S. Bocchetta, F., Bossi, P.Branchini, P. Campana, G. Capon, T. Capussela, F. Ceradini, F., Cesario, S. Chi, G. Chiefari, P. Ciambrone, F. Crucianelli
TL;DR
This study precisely measures the absolute branching ratio of the K+ -> pi+ pi0 (gamma) decay using a large dataset from the KLOE detector, providing a key parameter for kaon physics.
Contribution
First measurement of the absolute branching ratio of K+ -> pi+ pi0 (gamma) decay with high precision using the KLOE detector at DAFNE.
Findings
Branching ratio measured as 0.2065 ± 0.0005 (stat) ± 0.0008 (syst)
Utilized 20 million tagged K+ mesons for analysis
Achieved high-precision result including final-state radiation
Abstract
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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