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 F; 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 B; 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; 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.; SCURI, Fabrizio

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

Ambrosino F

•

Antonelli A

•

Antonelli M

altro

SCURI, Fabrizio

2005

journal article

Periodico

PHYSICS LETTERS. SECTION B

Abstract

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.