Phys. Rev. D
71,
111103(R)
(2005)
[5 pages]
Measurement of the branching fractions for J/ψ→ℓ+ℓ-
Z. Li et al. CLEO Collaboration
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Z. Li1, A. Lopez1, H. Mendez1, J. Ramirez1, G. S. Huang2, D. H. Miller2, V. Pavlunin2, B. Sanghi2, E. I. Shibata2, I. P. J. Shipsey2, G. S. Adams3, M. Chasse3, M. Cravey3, J. P. Cummings3, I. Danko3, J. Napolitano3, Q. He4, H. Muramatsu4, C. S. Park4, W. Park4, E. H. Thorndike4, T. E. Coan5, Y. S. Gao5, F. Liu5, M. Artuso6, C. Boulahouache6, S. Blusk6, J. Butt6, E. Dambasuren6, O. Dorjkhaidav6, J. Li6, N. Menaa6, R. Mountain6, R. Nandakumar6, R. Redjimi6, R. Sia6, T. Skwarnicki6, S. Stone6, J. C. Wang6, K. Zhang6, S. E. Csorna7, G. Bonvicini8, D. Cinabro8, M. Dubrovin8, R. A. Briere9, G. P. Chen9, J. Chen9, T. Ferguson9, G. Tatishvili9, H. Vogel9, M. E. Watkins9, J. L. Rosner10, N. E. Adam11, J. P. Alexander11, K. Berkelman11, D. G. Cassel11, V. Crede11, J. E. Duboscq11, K. M. Ecklund11, R. Ehrlich11, L. Fields11, R. S. Galik11, L. Gibbons11, B. Gittelman11, R. Gray11, S. W. Gray11, D. L. Hartill11, B. K. Heltsley11, D. Hertz11, L. Hsu11, C. D. Jones11, J. Kandaswamy11, D. L. Kreinick11, V. E. Kuznetsov11, H. Mahlke-Krüger11, T. O. Meyer11, P. U. E. Onyisi11, J. R. Patterson11, D. Peterson11, E. A. Phillips11, J. Pivarski11, D. Riley11, A. Ryd11, A. J. Sadoff11, H. Schwarthoff11, M. R. Shepherd11, S. Stroiney11, W. M. Sun11, D. Urner11, T. Wilksen11, M. Weinberger11, S. B. Athar12, P. Avery12, L. Breva-Newell12, R. Patel12, V. Potlia12, H. Stoeck12, J. Yelton12, P. Rubin13, C. Cawlfield14, B. I. Eisenstein14, G. D. Gollin14, I. Karliner14, D. Kim14, N. Lowrey14, P. Naik14, C. Sedlack14, M. Selen14, J. Williams14, J. Wiss14, K. W. Edwards15,16, D. Besson17, T. K. Pedlar18, D. Cronin-Hennessy19, K. Y. Gao19, D. T. Gong19, Y. Kubota19, T. Klein19, B. W. Lang19, S. Z. Li19, R. Poling19, A. W. Scott19, A. Smith19, S. Dobbs20, Z. Metreveli20, K. K. Seth20, A. Tomaradze20, P. Zweber20, J. Ernst21, A. H. Mahmood21, H. Severini22, D. M. Asner23, S. A. Dytman23, W. Love23, S. Mehrabyan23, J. A. Mueller23, and V. Savinov23 (CLEO Collaboration)
1University of Puerto Rico, Mayaguez, Puerto Rico 00681
2Purdue University, West Lafayette, Indiana 47907, USA
3Rensselaer Polytechnic Institute, Troy, New York 12180, USA
4University of Rochester, Rochester, New York 14627, USA
5Southern Methodist University, Dallas, Texas 75275, USA
6Syracuse University, Syracuse, New York 13244, USA
7Vanderbilt University, Nashville, Tennessee 37235, USA
8Wayne State University, Detroit, Michigan 48202, USA
9Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
10Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
11Cornell University, Ithaca, New York 14853
12University of Florida, Gainesville, Florida 32611, USA
13George Mason University, Fairfax, Virginia 22030, USA
14University of Illinois, Urbana-Champaign, Illinois 61801, USA
15Carleton University, Ottawa, Ontario, Canada K1S 5B6
16The Institute of Particle Physics, Canada
17University of Kansas, Lawrence, Kansas 66045, USA
18Luther College, Decorah, Iowa 52101, USA
19University of Minnesota, Minneapolis, Minnesota 55455, USA
20Northwestern University, Evanston, Illinois 60208, USA
21State University of New York at Albany, Albany, New York 12222, USA
22University of Oklahoma, Norman, Oklahoma 73019, USA
23University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
Received 11 March 2005; published 22 June 2005
We present measurements of the branching fractions for J/ψ→e+e- and μ+μ- using 3M ψ(2S) decays collected with the CLEO detector operating at the CESR e+e- collider. We obtain B(J/ψ→e+e-)=(5.945±0.067±0.042)% and B(J/ψ→μ+μ-)=(5.960±0.065±0.050)%, leading to an average of B(J/ψ→ℓ+ℓ-)=(5.953±0.056±0.042)% and a ratio of B(J/ψ→e+e-)/B(J/ψ→μ+μ-)=(99.7±1.2±0.6)%, all consistent with, but more precise than, previous measurements.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.71.111103
DOI:
10.1103/PhysRevD.71.111103
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