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

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

doi:10.1103/physrevd.71.111103

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

Z Li, D Hertz + 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 Rochester, University of Illinois Urbana-Champaign, University of Minnesota, Southern Methodist University, Syracuse University, University of Pittsburgh, University at Albany, State University of New York, Carnegie Mellon University, University of Florida, Wayne State University, Rensselaer Polytechnic Institute, Purdue University West Lafayette, McGill University, George Mason University, Northwestern University, Vanderbilt 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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