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Measurement of the absolute branching ratios for
semileptonic K± decays with the KLOE detector
The KLOE collaboration1, F. Ambrosino4, A. Antonelli1, M. Antonelli1, F. Archilli1, C. Bacci7, P. Beltrame2, G. Bencivenni1, S. Bertolucci1, C. Bini6, C. Bloise1, S. Bocchetta7, F. Bossi1, P. Branchini7, R. Caloi6, P. Campana1, G. Capon1, T. Capussela1, F. Ceradini7, S. Chi1, G. Chiefari4, P. Ciambrone1, E. De Lucia1, A. De Santis6, P. De Simone1, G. De Zorzi6, A. Denig2, A. Di Domenico6, C. Di Donato4, B. Di Micco7, A. Doria4, M. Dreucci1, G. Felici1, A. Ferrari1, M. L. Ferrer1, S. Fiore6, C. Forti1, P. Franzini6, C. Gatti1, P. Gauzzi6, S. Giovannella1, E. Gorini3, E. Graziani7, W. Kluge2, V. Kulikov10, F. Lacava6, G. Lanfranchi1, J. Lee-Franzini1,8, D. Leone2, M. Martini1, P. Massarotti4, W. Mei1, S. Meola4, S. Miscetti1, M. Moulson1, S. Müller1, F. Murtas1, M. Napolitano4, F. Nguyen7, M. Palutan1, E. Pasqualucci6, A. Passeri7, V. Patera1,5, F. Perfetto4, M. Primavera3, P. Santangelo1, G. Saracino4, B. Sciascia1, A. Sciubba1,5, A. Sibidanov1, T. Spadaro1, M. Testa6, L. Tortora7, P. Valente6, G. Venanzoni1, R. Versaci1 and G. Xu1,9
Using a sample of over 600 million ϕ → K+K− decays collected at the DAΦNE 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 Γ(Kμ3)/Γ(Ke3) = 0.6511±0.0064.
Using the semileptonic form factors measured in the same experiment, we obtain |Vusf+(0)| = 0.2141 ±0.0013$.
