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.
Measurement of the K-S ? pe? branching fraction with the KLOE experiment / Babusci, D; Berlowski, M; Bloise, C; Bossi, F; Branchini, P; Cao, B; 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, A; Mandaglio, G; Martini, M; Miscetti, S; Moskal, P; Passeri, A; del Rio, Ep; Schioppa, M; Selce, A; Silarski, M; Sirghi, F; Solodov, Ep; Wislicki, W; Wolke, M. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2023:2(2023). [10.1007/JHEP02(2023)098]
Measurement of the K-S ? pe? branching fraction with the KLOE experiment
D'Agostini, G;D'Amico, R;De Leo, V;Di Domenico, A;Fantini, G;Gauzzi, P;
2023
Abstract
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.| File | Dimensione | Formato | |
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