Measurement of the absolute branching ratios for semileptonic K+/- decays with the KLOE detector
- Ambrosino, F
- Antonelli, A
- Antonelli, M
- Archilli, F
- Bacci, C
- Beltrame, P
- Bencivenni, G
- Bertolucci, S
- Bini, Cesare
- Bloise, C
- Bocchetta, S
- Bossi, F
- Branchini, P
- Caloi, Rita
- Campana, P
- Capon, G
- Capussela, T
- Ceradini, F
- Chi, S
- Chiefari, G
- Ciambrone, P
- DE LUCIA, E
- DE SANTIS, Antonio
- DE SIMONE, P
- DE ZORZI, Guido
- Denig, A
- DI DOMENICO, Antonio
- DI DONATO, C
- DI MICCO, B
- Doria, A
- Dreucci, M
- Felici, G
- Ferrari, A
- Ferrer, Ml
- Fiore, Salvatore
- Forti, C
- Franzini, Paolo
- Gatti, C
- Gauzzi, Paolo
- Giovannella, S
- Gorini, E
- Graziani, E
- Kluge, W
- Kulikov, V
- Lacava, Francesco
- Lanfranchi, G
- LEE FRANZINI, J
- Leone, D
- Martini, M
- Massarotti, P
- Mei, W
- Meola, S
- Miscetti, S
- Moulson, M
- Muller, S
- Murtas, F
- Napolitano, M
- Nguyen, F
- Palutan, M
- Pasqualucci, E
- Passeri, A
- Patera, Vincenzo
- Perfetto, F
- Primavera, M
- Santangelo, P
- Saracino, G
- Sciascia, B
- Sciubba, Adalberto
- Sibidanov, A
- Spadaro, T
- Testa, Marianna
- Tortora, L
- Valente, P
- Venanzoni, G
- Versaci, R
- Xu, G.
DOIAbstract
Using a sample of over 600 million φ → K+K− decays collected at the DANE e+e− collider, we have measured with the KLOE detector the absolute branching ratios for the charged kaon semileptonic decays, K± → π0e±ν(γ) and K± → π0μ±ν(γ). The results, BR(Ke3) = 0.04965 ± 0.00038stat ± 0.00037syst and BR(Kμ3) = 0.03233 ± 0.00029stat ± 0.00026syst , are inclusive of radiation. Accounting for correlations, we derive the ratio (Kμ3)/(Ke3) = 0.6511 ± 0.0064. Using the semileptonic form factors measured in the same experiment, we obtain |Vus f+(0)| = 0.2141 ± 0.0013
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