Abstract
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 ± 0.00031stat ± 0.00025syst
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