Measurement of the K-S ? : pe? branching fraction with the KLOE experiment

Measurement of the K-S ? : pe? branching fraction with the KLOE experiment

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 kine...

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Hauptverfasser: 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
Format: Artikel
Sprache:eng
Schlagworte:
Branching fraction
e(+)-e(-) Experiments
Flavour Physics
Subatomic Physics
Subatomär fysik
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Zusammenfassung: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.
DOI:10.1007/JHEP02(2023)098