Study of the branching ratio and charge asymmetry for the decay K-S -> pi e nu with the KLOE detector
- Ambrosino, F
- Antonelli, A
- Antonelli, M
- Bacci, C
- Beltrame, P
- Bencivenni, G
- Bertolucci, S
- Bini, C
- Bloise, C
- Boci, V
- Bossi, F
- Bowring, D
- Branchini, P
- Caloi, R
- Campana, P
- Capon, G
- Capussela, T
- Ceradini, F
- Chi, S
- Chiefari, G
- Ciambrone, P
- Conetti, S
- De Lucia, E
- De Santis, A
- De Simone, P
- De Zorzi, G
- Dell'Agnello, S
- Denig, A
- Di Domenico, A
- Di Donato, C
- Di Falco, S
- Di Micco, B
- Doria, A
- Dreucci, M
- Felici, G
- Ferrari, A
- Ferrer, ML
- Finocchiaro, G
- Fiore, S
- Forti, C
- Franzini, P
- Gatti, C
- Gauzzi, P
- Giovannella, S
- Gorini, E
- Graziani, E
- Incagli, M
- Kluge, W
- Kulikov, V
- Lacava, F
- Lanfranchi, G
- Lee Franzini, J
- Leone, D
- Martini, M
- Massarotti, P
- Mei, W
- Meola, S
- Miscetti, S
- Moulson, A
- Muller, S
- Murtas, F
- Napolitano, M
- Nguyen, F
- Palutan, M
- Pasqualucci, E
- Passeri, A
- Patera, V
- Perfetto, F
- Pontecorvo, L
- Primavera, M
- Santangelo, P
- Saracino, G
- Sciascia, B
- Sciubba, A
- Scuri, F
- Sfiligoi, I
- Spadaro, T
- Testa, M
- Tortora, L
- Valente, P
- Valeriani, B
- Venanzoni, G
- Veneziano, S
- Ventura, A
- Versaci, R
- Xu, G.
- SANTOVETTI, EMANUELE
DOIAbstract
Among some 400 million KSKL pairs produced in e(+)e(-) annihilations at DA Phi DNE, similar to 6500 each of K-S -> pi(+)e(-)(v) over bar and K-S -> pi(-)e(+)v decays have been observed with the KLOE detector. From these, the ratio Gamma(K-S -> pi ev)/Gamma(K-S -> pi(+)pi(-)) = (10.19 +/- 0.13) x 10(-4) is obtained, improving the accuracy on BR(K-S -> pi ev) by a factor of four and providing the most precise test of the Delta S = Delta Q rule. From the partial width F(K-S -> pi ev), a value for f(+)(K0) (0) x V-us is obtained that is in agreement with unitarity of the quark-mixing matrix. The lepton charge asymmetry A(S) = (1.5 +/- 9.6(stat) 2.9(syst)) x 10(-3) is compatible with the requirements of CPT invariance. The form-factor slope agre...
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