Measurement of the absolute branching ratio of the K~+→π~+π~?π~+(γ)decay with the KLOE detector

摘要

The absolute branching ratio of the K~+→π~+π~?π~+(γ)decay, inclusive of final-state radiation, has been measured using ~17 million tagged K~+ mesons collected with the KLOE detector at DAΦNE, the Frascati φ-factory. The result is: BR(K~+→π~+π~?π~+(γ))=0.05565±0.00031_(stat)±0.00025_(syst) a factor similar, equals5 more precise with respect to the previous result. This work completes the program of precision measurements of the dominant kaon branching ratios at KLOE.