UNI-MB - logo
UMNIK - logo
 
E-resources
Peer reviewed Open access
  • A study of the radiative KL...
    Ambrosino, F.; Antonelli, A.; Antonelli, M.; Archilli, F.; Bacci, C.; Beltrame, P.; Bencivenni, G.; Bertolucci, S.; Bini, C.; Bloise, C.; Bocchetta, S.; Bossi, F.; Branchini, P.; Caloi, R.; Campana, P.; Capon, G.; Capussela, T.; Ceradini, F.; Cesario, F.; Chi, S.; Chiefari, G.; Ciambrone, P.; Crucianelli, F.; De Lucia, E.; De Santis, A.; De Simone, P.; De Zorzi, G.; Denig, A.; Di Domenico, A.; Di Donato, C.; Di Micco, B.; Doria, A.; Dreucci, M.; Felici, G.; Ferrari, A.; Ferrer, M.L.; Fiore, S.; Forti, C.; Franzini, P.; Gatti, C.; Gauzzi, P.; Giovannella, S.; Gorini, E.; Graziani, E.; Kluge, W.; Kulikov, V.; Lacava, F.; Lanfranchi, G.; Lee-Franzini, J.; Leone, D.; Martini, M.; Massarotti, P.; Mei, W.; Meola, S.; Miscetti, S.; Moulson, M.; Müller, S.; Murtas, F.; Napolitano, M.; Nguyen, F.; Palutan, M.; Pasqualucci, E.; Passeri, A.; Patera, V.; Perfetto, F.; Primavera, M.; Santangelo, P.; Saracino, G.; Sciascia, B.; Sciubba, A.; Sibidanov, A.; Spadaro, T.; Testa, M.; Tortora, L.; Valente, P.; Venanzoni, G.; Versaci, R.; Xu, G.

    European physical journal. C, Particles and fields, 06/2008, Volume: 55, Issue: 4
    Journal Article

    We present a measurement of the ratio R=Γ(K 0 e3γ ;E * γ > 30 MeV, θ * γ >20 ° )/Γ(K 0 e3 ) and a first measurement of the direct emission contribution in semileptonic K L decays. The measurement was performed at the DA NE φ factory by selecting φ→K L K S decays with the KLOE detector. We use 328 pb -1 of data, corresponding to about 3.5 million K 0 e3 events and about 9000 K 0 e3γ radiative events. Our result is R=(924±23 stat ±16 syst )×10 -5 for the branching ratio and 〈X〉=-2.3±1.3 stat ±1.4 syst for the effective strength parameter describing direct emission.