Phys. Rev. Lett.
94,
012001
(2005)
[5 pages]
Measurement of the Muonic Branching Fractions of the Narrow Upsilon Resonances
G. S. Adams et al. CLEO Collaboration
Show All Authors/Affiliations
Hide All Authors/Affiliations
G. S. Adams1, M. Chasse1, M. Cravey1, J. P. Cummings1, I. Danko1, J. Napolitano1, D. Cronin-Hennessy2, C. S. Park2, W. Park2, J. B. Thayer2, E. H. Thorndike2, T. E. Coan3, Y. S. Gao3, F. Liu3, R. Stroynowski3, M. Artuso4, C. Boulahouache4, S. Blusk4, J. Butt4, E. Dambasuren4, O. Dorjkhaidav4, N. Menaa4, R. Mountain4, H. Muramatsu4, R. Nandakumar4, R. Redjimi4, R. Sia4, T. Skwarnicki4, S. Stone4, J. C. Wang4, K. Zhang4, S. E. Csorna5, G. Bonvicini6, D. Cinabro6, M. Dubrovin6, A. Bornheim7, S. P. Pappas7, A. J. Weinstein7, R. A. Briere8, G. P. Chen8, T. Ferguson8, G. Tatishvili8, H. Vogel8, M. E. Watkins8, N. E. Adam9, J. P. Alexander9, K. Berkelman9, D. G. Cassel9, J. E. Duboscq9, K. M. Ecklund9, R. Ehrlich9, L. Fields9, R. S. Galik9, L. Gibbons9, B. Gittelman9, R. Gray9, S. W. Gray9, D. L. Hartill9, B. K. Heltsley9, D. Hertz9, L. Hsu9, C. D. Jones9, J. Kandaswamy9, D. L. Kreinick9, V. E. Kuznetsov9, H. Mahlke-Krüger9, T. O. Meyer9, P. U. E. Onyisi9, J. R. Patterson9, D. Peterson9, J. Pivarski9, D. Riley9, J. L. Rosner9,*, A. Ryd9, A. J. Sadoff9, H. Schwarthoff9, M. R. Shepherd9, W. M. Sun9, J. G. Thayer9, D. Urner9, T. Wilksen9, M. Weinberger9, S. B. Athar10, P. Avery10, L. Breva-Newell10, R. Patel10, V. Potlia10, H. Stoeck10, J. Yelton10, P. Rubin11, C. Cawlfield12, B. I. Eisenstein12, G. D. Gollin12, I. Karliner12, D. Kim12, N. Lowrey12, P. Naik12, C. Sedlack12, M. Selen12, J. J. Thaler12, J. Williams12, J. Wiss12, K. W. Edwards13, D. Besson14, K. Y. Gao15, D. T. Gong15, Y. Kubota15, B. W. Lang15, S. Z. Li15, R. Poling15, A. W. Scott15, A. Smith15, C. J. Stepaniak15, J. Urheim15, Z. Metreveli16, K. K. Seth16, A. Tomaradze16, P. Zweber16, J. Ernst17, A. H. Mahmood17, K. Arms18, K. K. Gan18, D. M. Asner19, S. A. Dytman19, S. Mehrabyan19, J. A. Mueller19, V. Savinov19, Z. Li20, A. Lopez20, H. Mendez20, J. Ramirez20, G. S. Huang21, D. H. Miller21, V. Pavlunin21, B. Sanghi21, E. I. Shibata21, and I. P. J. Shipsey21 (CLEO Collaboration)
1Rensselaer Polytechnic Institute, Troy, New York 12180, USA
2University of Rochester, Rochester, New York 14627, USA
3Southern Methodist University, Dallas, Texas 75275, USA
4Syracuse University, Syracuse, New York 13244, USA
5Vanderbilt University, Nashville, Tennessee 37235, USA
6Wayne State University, Detroit, Michigan 48202, USA
7California Institute of Technology, Pasadena, California 91125, USA
8Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
9Cornell University, Ithaca, New York 14853, USA
10University of Florida, Gainesville, Florida 32611, USA
11George Mason University, Fairfax, Virginia 22030, USA
12University of Illinois, Urbana-Champaign, Illinois 61801, USA
13Carleton University, Ottawa, Ontario, Canada K1S 5B6 and the Institute of Particle Physics, Canada
14University of Kansas, Lawrence, Kansas 66045, USA
15University of Minnesota, Minneapolis, Minnesota 55455, USA
16Northwestern University, Evanston, Illinois 60208, USA
17State University of New York at Albany, Albany, New York 12222, USA
18Ohio State University, Columbus, Ohio 43210, USA
19University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
20University of Puerto Rico, Mayaguez, Puerto Rico 00681
21Purdue University, West Lafayette, Indiana 47907, USA
Received 3 September 2004; published 6 January 2005
The decay branching fractions of the three narrow Υ resonances to μ+μ- have been measured by analyzing about 4.3 fb-1 e+e- data collected with the CLEO III detector. The branching fraction B(Υ(1S)→μ+μ-)=(2.49±0.02±0.07)% is consistent with the current world average, but B(Υ(2S)→μ+μ-)=(2.03±0.03±0.08)% and B(Υ(3S)→μ+μ-)=(2.39±0.07±0.10)% are significantly larger than prior results. These new muonic branching fractions imply a narrower total decay width for the Υ(2S) and Υ(3S) resonances and lower other branching fractions that rely on these decays in their determination.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.012001
DOI:
10.1103/PhysRevLett.94.012001
*On leave of absence from University of Chicago, USA.
|
|
