Measurement of the branching fractions forJ/ψ→ℓ+ℓ−

Z Li,A J Sadoff,D T Gong,L Breva-Newell,V Potlia,K Y Gao,O Dorjkhaidav,J E Duboscq,Q He,T E Coan,S Blusk,P Naik,S Mehrabyan,V Pavlunin,E Dambasuren,C Boulahouache,J Napolitano,E I Shibata,V Savinov,M E Watkins,G Bonvicini,S E Csorna,P Rubin,K W Edwards,D M Asner,R Nandakumar,G S Adams,M Cravey,T Klein,M R Shepherd,A H Mahmood,D L Hartill,H Mahlke-Krüger,B Sanghi,D G Cassel,E H Thorndike,M Weinberger,H Stoeck,K K Seth,S B Athar,W Park,L Hsu,M Chasse,J Kandaswamy,B K Heltsley,I Karliner,D Hertz,H Muramatsu,R Poling,F Liu,T Wilksen,R Ehrlich,B I Eisenstein,R Gray,L Fields,T K Pedlar,D Peterson,S W Gray,S Stroiney,G Tatishvili,R Mountain,J Pivarski,D Cinabro,C Sedlack,D Riley,D L Kreinick,M Dubrovin,B W Lang,N Lowrey,C S Park,Z Metreveli,R S Galik,H Schwarthoff,R A Briere,C Cawlfield,R Sia,B Gittelman,D Urner,D Cronin-Hennessy,N Menaa,C D Jones,Jonathan L Rosner ,K Berkelman,J Alexander ,Y S Gao,J Chen,M Selen,G D Gollin,K M Ecklund,L Gibbons,W A Love ,James S Williams ,J P Cummings,J Yelton,J Butt,E A Phillips,В Е Кузнецов ,H Severini,S Dytman ,T Skwarnicki,T O Meyer,I Dankó ,A López ,P Zweber,J Ernst,N Adam ,A Rýd ,R Redjimi,A W Scott,A Tomaradze,P U E Onyisi,W Sun ,A Smith,V Credé ,J C Wang,J Li,D Kim,T Ferguson,P Avery,G S Huang,R Patel,J Muêller ,I P J Shipsey,K Zhang,H Vogel,Y Kubota,J E Ramirez Vargas ,H Méndez ,D Besson,J R Patterson,D H Miller,S Dobbs,S Stone,G P Chen,J Wiss,M Artuso,S Z Li

doi:10.1103/physrevd.71.111103

Measurement of the branching fractions forJ/ψ→ℓ+ℓ−

Z Li, A J Sadoff + Show 135 more

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https://doi.org/10.1103/physrevd.71.111103

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Journal: Physical Review D	Publication Date: Jun 22, 2005
Citations: 20

Affiliation: Cornell University, University of Minnesota, University of Florida, Syracuse University, University of Rochester, Southern Methodist University, University of Illinois Urbana-Champaign, University of Pittsburgh, Purdue University West Lafayette, Rensselaer Polytechnic Institute, Carnegie Mellon University, Wayne State University, Vanderbilt University, George Mason University, McGill University, University at Albany, State University of New York, Northwestern University, Luther College

#Previous Measurements #Measurement Of Fractions + Show 2 more

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Abstract

We present measurements of the branching fractions for J/psi --> e+e- and mu+mu- using 3M psi(2S) decays collected with the CLEO detector operating at the CESR e+e- collider. We obtain B(J/psi --> e+e-) = (5.945 +- 0.067 +- 0.042 )% and B(J/psi --> mu+mu-) = (5.960 +- 0.065 +- 0.050)%, leading to an average of B(J/psi --> l+l-) = (5.953 +- 0.056 +- 0.042)% and a ratio of B(J/psi --> e+e-) / B(J/psi --> mu+mu-) = (99.7 +- 1.2 +- 0.6)%, all consistent with, but more precise than, previous measurements.

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