Measurement of the leptonic decay widths of the phi-meson with the KLOE detector

Ambrosino, F; Antonelli, A; Antonelli, M; Bacci, C; Barva, M; Beltrame, P; Bencivenni, G; Bertolucci, S; Bini, C; Bloise, C; Bocci, V; Bossi, F; Bowring, D; Branchini, P; Bulychjov, Sa; Caloi, R; Campana, P; Capon, G; Capussela, T; Carboni, G; Ceradini, Filippo; Cervelli, 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, Biagio; Doria, A; Dreucci, M; Farilla, A; Felici, G; Ferrari, A; Ferrer, Ml; Finocchiaro, G; 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; Martemianov, M; Martini, M; Massarotti, P; Matsyuk, M; Mei, W; Meola, S; Messi, R; Miscetti, S; Moulson, M; Muller, S; Murtas, F; Napolitano, M; Nguyen, F; Palutan, M; Pasqualucci, E; Passalacqua, L; Passeri, A; Patera, V; Perfetto, F; Pontecorvo, L; Primavera, M; Santangelo, P; Santovetti, E; Saracino, G; Schamberger, Rd; Sciascia, B; Sciubba, A; Scuri, F; Sfiligoi, I; Sibidanov, A; Spadaro, T; Spiriti, E; Tabidze, M; Testa, M; Tortora, L; Valente, P; Valeriani, B; Venanzoni, G; Veneziano, S; Ventura, A; Versaci, R; Villella, I; Xu, G.

doi:10.1016/j.physletb.2005.01.010

The phi-meson leptonic widths, Gamma(ee) and Gamma(mumu), are obtained, respectively, from the (e)+(-)(e) forward-backward asymmetry and the mu(+)mu(-) cross section around the phi-mass energy. We find Gamma(ee) = 1.32 +/- 0.05 +/- 0.03 keV and rootGamma(ee) Gamma(mumu)= 1.320 +/- 0.018 +/- 0.017 keV. These results, compatible with Gamma(ee) = Gamma(mumu), provide a precise test of lepton universality. Combining the two results gives Gamma(ee) (phi) = 1.320 +/- 0.023 keV. (C) 2005 Elsevier B.V. All rights reserved.

Ambrosino, F., Antonelli, A., Antonelli, M., Bacci, C., Barva, M., Beltrame, P., et al. (2005). Measurement of the leptonic decay widths of the phi-meson with the KLOE detector. PHYSICS LETTERS. SECTION B, 608(3-4), 199-205 [10.1016/j.physletb.2005.01.010].