Phys. Rev. D
58,
052004
(1998)
[15 pages]
Hadronic transitions Υ(2S)→Υ(1S)
J. P. Alexander et al. (CLEO Collaboration)
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J. P. Alexander, R. Baker, C. Bebek, B. E. Berger, K. Berkelman, K. Bloom, V. Boisvert, D. G. Cassel, D. S. Crowcroft, M. Dickson, S. von Dombrowski, P. S. Drell, K. M. Ecklund, R. Ehrlich, A. D. Foland, P. Gaidarev, R. S. Galik, L. Gibbons, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, P. I. Hopman, J. Kandaswamy, P. C. Kim, D. L. Kreinick, T. Lee, Y. Liu, N. B. Mistry, C. R. Ng, E. Nordberg, M. Ogg*, J. R. Patterson, D. Peterson, D. Riley, A. Soffer, B. Valant-Spaight, and C. Ward
Cornell University, Ithaca, New York 14853
M. Athanas, P. Avery, C. D. Jones, M. Lohner, S. Patton, C. Prescott, J. Yelton, and J. Zheng
University of Florida, Gainesville, Florida 32611
G. Brandenburg, R. A. Briere, A. Ershov, Y. S. Gao, D. Y.-J. Kim, R. Wilson, and H. Yamamoto
Harvard University, Cambridge, Massachusetts 02138
T. E. Browder, Y. Li, and J. L. Rodriguez
University of Hawaii at Manoa, Honolulu, Hawaii 96822
T. Bergfeld, B. I. Eisenstein, J. Ernst, G. E. Gladding, G. D. Gollin, R. M. Hans, E. Johnson, I. Karliner, M. A. Marsh, M. Palmer, M. Selen, and J. J. Thaler
University of Illinois, Urbana-Champaign, Illinois 61801
K. W. Edwards
Carleton University, Ottawa, Ontario, Canada K1S 5B6 and the Institute of Particle Physics, Canada
A. Bellerive, R. Janicek, D. B. MacFarlane, and P. M. Patel
McGill University, Montréal, Québec, Canada H3A 2T8 and the Institute of Particle Physics, Canada
A. J. Sadoff
Ithaca College, Ithaca, New York 14850
R. Ammar, P. Baringer, A. Bean, D. Besson, D. Coppage, C. Darling, R. Davis, S. Kotov, I. Kravchenko, N. Kwak, and L. Zhou
University of Kansas, Lawrence, Kansas 66045
S. Anderson, Y. Kubota, S. J. Lee, J. J. O’Neill, R. Poling, T. Riehle, and A. Smith
University of Minnesota, Minneapolis, Minnesota 55455
M. S. Alam, S. B. Athar, Z. Ling, A. H. Mahmood, S. Timm, and F. Wappler
State University of New York at Albany, Albany, New York 12222
A. Anastassov, J. E. Duboscq, D. Fujino†, K. K. Gan, T. Hart, K. Honscheid, H. Kagan, R. Kass, J. Lee, M. B. Spencer, M. Sung, A. Undrus‡, R. Wanke, A. Wolf, and M. M. Zoeller
Ohio State University, Columbus, Ohio 43210
B. Nemati, S. J. Richichi, W. R. Ross, H. Severini, and P. Skubic
University of Oklahoma, Norman, Oklahoma 73019
M. Bishai, J. Fast, J. W. Hinson, N. Menon, D. H. Miller, E. I. Shibata, I. P. J. Shipsey, and M. Yurko
Purdue University, West Lafayette, Indiana 47907
S. Glenn, S. D. Johnson, Y. Kwon§, S. Roberts, and E. H. Thorndike
University of Rochester, Rochester, New York 14627
C. P. Jessop, K. Lingel, H. Marsiske, M. L. Perl, V. Savinov, D. Ugolini, R. Wang, and X. Zhou
Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
T. E. Coan, V. Fadeyev, I. Korolkov, Y. Maravin, I. Narsky, V. Shelkov, J. Staeck, R. Stroynowski, I. Volobouev, and J. Ye
Southern Methodist University, Dallas, Texas 75275
M. Artuso, F. Azfar, A. Efimov, M. Goldberg, D. He, S. Kopp, G. C. Moneti, R. Mountain, S. Schuh, T. Skwarnicki, S. Stone, G. Viehhauser, and X. Xing
Syracuse University, Syracuse, New York 13244
J. Bartelt, S. E. Csorna, V. Jain**, K. W. McLean, and S. Marka
Vanderbilt University, Nashville, Tennessee 37235
R. Godang, K. Kinoshita, I. C. Lai, P. Pomianowski, and S. Schrenk
Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
G. Bonvicini, D. Cinabro, R. Greene, L. P. Perera, and G. J. Zhou
Wayne State University, Detroit, Michigan 48202
M. Chadha, S. Chan, G. Eigen, J. S. Miller, C. O’Grady, M. Schmidtler, J. Urheim, A. J. Weinstein, and F. Würthwein
California Institute of Technology, Pasadena, California 91125
D. W. Bliss, G. Masek, H. P. Paar, S. Prell, and V. Sharma
University of California, San Diego, La Jolla, California 92093
D. M. Asner, J. Gronberg, T. S. Hill, D. J. Lange, R. J. Morrison, H. N. Nelson, T. K. Nelson, D. Roberts, and A. Ryd
University of California, Santa Barbara, California 93106
R. Balest, B. H. Behrens, W. T. Ford, A. Gritsan, H. Park, J. Roy, and J. G. Smith
University of Colorado, Boulder, Colorado 80309-0390
(CLEO Collaboration)
Received 26 February 1998; published 7 August 1998
Using a 73.6pb-1 data sample of Υ(2S) events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have investigated the hadronic transitions between the Υ(2S) and the Υ(1S). The dipion transition Υ(2S)→Υ(1S)π+π- was studied using two different analysis techniques. Selecting events in which Υ(1S)→e+e-,μ+μ- (“exclusive” analysis), and using the Υ(1S) leptonic branching fractions world averages from the PDG review, we obtained B(Υ(2S)→Υ(1S)π+π-)=0.189±0.004±0.010, while using a method allowing Υ(1S)→anything (“inclusive” analysis) we obtained B(Υ(2S)→Υ(1S)π+π-)=0.196±0.002±0.010. The appropriate weighted average of the two measurements gives B(Υ(2S)→Υ(1S)π+π-)=0.192±0.002±0.010. Combining the exclusive and inclusive results we derive the Υ(1S) leptonic branching fractions Bee=0.0229±0.0008±0.0011 and Bμμ=0.0249±0.0008±0.0013. We also studied Υ(2S)→Υ(1S)π0π0 and obtained B(Υ(2S)→Υ(1S)π0π0)=0.092±0.006±0.008. Parameters of the ππ system (dipion invariant mass spectra, angular distributions) were analyzed and found to be consistent with current theoretical models. Lastly, we searched for the η and single π0 transitions and obtained the 90% confidence level upper limits B(Υ(2S)→Υ(1S)η)<0.0028 and B(Υ(2S)→Υ(1S)π0)<0.0011.
© 1998 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.58.052004
DOI:
10.1103/PhysRevD.58.052004
*Permanent address: University of Texas, Austin, TX 78712. †Permanent address: Lawrence Livermore National Laboratory, Livermore, CA 94551. ‡Permanent address: BINP, RU-630090 Novosibirsk, Russia. §Permanent address: Yonsei University, Seoul 120-749, Korea. **Permanent address: Brookhaven National Laboratory, Upton, NY 11973.
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