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Babusci, D.; Berlowski, M.; Bloise, C.; Bossi, F.; Branchini, P.; Cao, Bo; Ceradini, F.; Ciambrone, P.; Curciarello, F.; Czerwinski, E.; D'Agostini, G.; D'Amico, R.; Dane, E.; De Leo, V.; De Lucia, E.; De Santis, A.; De Simone, P.; Di Cicco, A.; Di Domenico, A.; Diociaiuti, E.; Domenici, D.; D'Uffizi, A.; Fantini, G.; Gajos, A.; Gamrat, S.; Gauzzi, P.; Giovannella, S.; Graziani, E.; Kang, X.; Kupsc, Andrzej; Mandaglio, G.; Martini, M.; Miscetti, S.; Moskal, P.; Passeri, A.; Perez del Rio, E.; Schioppa, M.; Selce, A.; Silarski, M.; Sirghi, F.; Solodov, E. P.; Wislicki, W.; Wolke, Magnus
The journal of high energy physics, 02/2023 2Journal Article
The ratio R = gamma(K-S -> pi e nu)/gamma(KS -> pi(+)pi(-)) has been measured with a sample of 300 million KS mesons produced in phi -KLKS decays recorded by the KLOE experiment at the DA Phi NE e(+)e(-) collider. K-S -> pi e nu events are selected by a boosted decision tree built with kinematic variables and time-of-flight measurements. Data control samples of K-L -> pi e nu decays are used to evaluate signal selection efficiencies. With 49647 +/- 316 signal events we measure R = (1.0421 +/- 0.0066(stat) +/- 0.0075(syst)) x 10(-3). The combination with our previous measurement gives R = (1.0338 +/- 0.0054(stat) +/- 0.0064(syst)) x 10(-3). From this value we derive the branching fraction B(K-S -> pi e nu) = (7.153 +/- 0.037(stat)+/- 0.044(syst)) x 10(-4) and f(+)(0)|V-us| = 0.2170 +/- 0.009.
