Phys. Rev. D 59, 032003 (1999) [5 pages]
Measurement of the mass splittings between the bb̅ χb,J(1P) states
K. W. Edwards et al. (CLEO Collaboration)
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K. W. Edwards1, A. Bellerive2, R. Janicek2, D. B. MacFarlane2, P. M. Patel2, A. J. Sadoff3, R. Ammar4, P. Baringer4, A. Bean4, D. Besson4, D. Coppage4, C. Darling4, R. Davis4, S. Kotov4, I. Kravchenko4, N. Kwak4, L. Zhou4, S. Anderson5, Y. Kubota5, S. J. Lee5, J. J. O’Neill5, R. Poling5, T. Riehle5, A. Smith5, M. S. Alam6, S. B. Athar6, Z. Ling6, A. H. Mahmood6, S. Timm6, F. Wappler6, A. Anastassov7, J. E. Duboscq7, D. Fujino7 *, K. K. Gan7, T. Hart7, K. Honscheid7, H. Kagan7, R. Kass7, J. Lee7, H. Schwarthoff7, M. B. Spencer7, M. Sung7, A. Undrus7 †, A. Wolf7, M. M. Zoeller7, S. J. Richichi8, H. Severini8, P. Skubic8, M. Bishai9, J. Fast9, J. W. Hinson9, N. Menon9, D. H. Miller9, E. I. Shibata9, I. P. J. Shipsey9, M. Yurko9, S. Glenn10, Y. Kwon10 ‡, A. L. Lyon10, S. Roberts10, E. H. Thorndike10, C. P. Jessop11, K. Lingel11, H. Marsiske11, M. L. Perl11, V. Savinov11, D. Ugolini11, X. Zhou11, T. E. Coan12, V. Fadeyev12, I. Korolkov12, Y. Maravin12, I. Narsky12, V. Shelkov12, J. Staeck12, R. Stroynowski12, I. Volobouev12, J. Ye12, M. Artuso13, F. Azfar13, A. Efimov13, M. Goldberg13, D. He13, S. Kopp13, G. C. Moneti13, R. Mountain13, S. Schuh13, T. Skwarnicki13, S. Stone13, G. Viehhauser13, J. C. Wang13, X. Xing13, J. Bartelt14, S. E. Csorna14, V. Jain14 §, K. W. McLean14, S. Marka14, R. Godang15, K. Kinoshita15, I. C. Lai15, P. Pomianowski15, S. Schrenk15, G. Bonvicini16, D. Cinabro16, R. Greene16, L. P. Perera16, G. J. Zhou16, M. Chadha17, S. Chan17, G. Eigen17, J. S. Miller17, M. Schmidtler17, J. Urheim17, A. J. Weinstein17, F. Würthwein17, D. W. Bliss18, D. E. Jaffe18, G. Masek18, H. P. Paar18, S. Prell18, V. Sharma18, D. M. Asner19, J. Gronberg19, T. S. Hill19, D. J. Lange19, R. J. Morrison19, H. N. Nelson19, T. K. Nelson19, D. Roberts19, B. H. Behrens20, W. T. Ford20, A. Gritsan20, J. Roy20, J. G. Smith20, J. P. Alexander21, R. Baker21, C. Bebek21, B. E. Berger21, K. Berkelman21, K. Bloom21, V. Boisvert21, D. G. Cassel21, D. S. Crowcroft21, M. Dickson21, S. von Dombrowski21, P. S. Drell21, K. M. Ecklund21, R. Ehrlich21, A. D. Foland21, P. Gaidarev21, R. S. Galik21, L. Gibbons21, B. Gittelman21, S. W. Gray21, D. L. Hartill21, B. K. Heltsley21, P. I. Hopman21, J. Kandaswamy21, D. L. Kreinick21, T. Lee21, Y. Liu21, N. B. Mistry21, C. R. Ng21, E. Nordberg21, M. Ogg21 **, J. R. Patterson21, D. Peterson21, D. Riley21, A. Soffer21, B. Valant-Spaight21, C. Ward21, M. Athanas22, P. Avery22, C. D. Jones22, M. Lohner22, S. Patton22, C. Prescott22, J. Yelton22, J. Zheng22, G. Brandenburg23, R. A. Briere23, A. Ershov23, Y. S. Gao23, D. Y.-J. Kim23, R. Wilson23, H. Yamamoto23, T. E. Browder24, Y. Li24, J. L. Rodriguez24, T. Bergfeld25, B. I. Eisenstein25, J. Ernst25, G. E. Gladding25, G. D. Gollin25, R. M. Hans25, E. Johnson25, I. Karliner25, M. A. Marsh25, M. Palmer25, M. Selen25, and J. J. Thaler25 (CLEO Collaboration) )
1Carleton University, Ottawa, Ontario, Canada K1S 5B6the Institute of Particle Physics, Canada
2McGill University, Montréal, Québec, Canada H3A 2T8the Institute of Particle Physics, Canada
3Ithaca College, Ithaca, New York 14850
4University of Kansas, Lawrence, Kansas 66045
5University of Minnesota, Minneapolis, Minnesota 55455
6State University of New York at Albany, Albany, New York 12222
7Ohio State University, Columbus, Ohio 43210
8University of Oklahoma, Norman, Oklahoma 73019
9Purdue University, West Lafayette, Indiana 47907
10University of Rochester, Rochester, New York 14627
11Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
12Southern Methodist University, Dallas, Texas 75275
13Syracuse University, Syracuse, New York 13244
14Vanderbilt University, Nashville, Tennessee 37235
15Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
16Wayne State University, Detroit, Michigan 48202
17California Institute of Technology, Pasadena, California 91125
18University of California, San Diego, La Jolla, California 92093
19University of California, Santa Barbara, California 93106
20University of Colorado, Boulder, Colorado 80309-0390
21Cornell University, Ithaca, New York 14853
22University of Florida, Gainesville, Florida 32611
23Harvard University, Cambridge, Massachusetts 02138
24University of Hawaii at Manoa, Honolulu, Hawaii 96822
25University of Illinois, Urbana-Champaign, Illinois 61801
Received 12 March 1998; published 12 January 1999
We present new measurements of photon energies and branching fractions for the radiative transitions Υ(2S)→γχb(J=0,1,2)(1P). The masses of the χb states are determined from the measured radiative photon energies. The ratio of mass splittings between the χb substates, r≡(MJ=2-MJ=1)/(MJ=1-MJ=0), with M the χb mass, provides information on the nature of the bb̅ confining potential. We find r(1P)=0.542±0.022±0.024. This value is somewhat lower than the previous world average, but more consistent with the theoretical expectation that r(1P)<r(2P); i.e., that this mass splitting ratio is smaller for the χb(1P) states than for the χb(2P) states.
©1999 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevD.59.032003
DOI: 10.1103/PhysRevD.59.032003
PACS: 13.40.Hq, 12.39.Jh, 12.39.Pn, 14.40.Gx
* 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.
** Permanent address: University of Texas, Austin, TX 78712.
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