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

F Ambrosino,M Barva,A Doria,F Nguyen,I Sfiligoi,C Forti,S Veneziano,E Spiriti,P Ciambrone,B Di Micco,G Chiefari,A Passeri,F Lacava,A Sibidanov,P Gauzzi,T Spadaro,S Bertolucci,G Capon,S Miscetti,M Napolitano,G Lanfranchi,R Versaci,V Bocci,P Branchini,A Sciubba,F Ceradini,W Mei,L Pontecorvo,A Antonelli,D Bowring,P Santangelo,A Denig,F Perfetto,S Conetti,G Carboni,A Ventura,G Finocchiaro,R Caloi,M Antonelli,S Müller,V Kulikov,M Palutan,A Di Domenico,I Villella,M Tabidze,B Valeriani,M Moulson,D Leone,M Dreucci,P Massarotti,A Ferrari,F Cervelli,P Campana,G Saracino,P Franzini,C Bacci,S Chi,A Farilla,P Beltrame,G De Zorzi,F Bossi,C Bini,G Bencivenni,F Murtas,R Messi,M Primavera,W Kluge,E Gorini,P De Simone,C Bloise,E Santovetti,L Passalacqua,T Capussela,M Incagli,C Di Donato,M Matsyuk,G Venanzoni,P Valente,G Felici,F Scuri,M Martemianov,S Di Falco,A De Santis,S Meola,C Gatti,S Giovannella,M Testa,M Martini,L Tortora,B Sciascia,E Pasqualucci,V Patera,E De Lucia,E Graziani,J Lee‐Franzini ,M L Ferrer ,S Dell’agnello ,R D Schamberger ,S A Bulychjov ,G F Xu

doi:10.1016/j.physletb.2005.01.010

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

F Ambrosino, M Barva + Show 98 more

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https://doi.org/10.1016/j.physletb.2005.01.010

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Journal: Physics Letters B	Publication Date: Jan 13, 2005
Citations: 17	License type: cc-by

Affiliation: INFN Sezione di Napoli, INFN Sezione di Roma I, National Laboratory of Frascati, Roma Tre University, University of Virginia, Sapienza University of Rome

#Forward Backward Asymmetry #KLOE Detector + Show 8 more

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Abstract

The ϕ-meson leptonic widths, Γee and Γμμ, are obtained, respectively, from the e+e− forward–backward asymmetry and the μ+μ− cross section around the ϕ-mass energy. We find Γee=1.32±0.05±0.03 keV and ΓeeΓμμ=1.320±0.018±0.017 keV. These results, compatible with Γee=Γμμ, provide a precise test of lepton universality. Combining the two results gives Γℓℓ(ϕ)=1.320±0.023 keV.

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