Phys. Rev. Lett. 94, 032001 (2005) [5 pages]
Photon Transitions in Υ(2S) and Υ(3S) Decays
M. Artuso et al. CLEO Collaboration
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M. Artuso1, C. Boulahouache1, S. Blusk1, J. Butt1, E. Dambasuren1, O. Dorjkhaidav1, J. Li1, N. Menaa1, R. Mountain1, H. Muramatsu1, R. Nandakumar1, R. Redjimi1, R. Sia1, T. Skwarnicki1, S. Stone1, J. C. Wang1, K. Zhang1, S. E. Csorna2, G. Bonvicini3, D. Cinabro3, M. Dubrovin3, A. Bornheim4, S. P. Pappas4, A. J. Weinstein4, J. L. Rosner5, R. A. Briere6, G. P. Chen6, T. Ferguson6, G. Tatishvili6, H. Vogel6, M. E. Watkins6, N. E. Adam7, J. P. Alexander7, K. Berkelman7, D. G. Cassel7, V. Crede7, J. E. Duboscq7, K. M. Ecklund7, R. Ehrlich7, L. Fields7, R. S. Galik7, L. Gibbons7, B. Gittelman7, R. Gray7, S. W. Gray7, D. L. Hartill7, B. K. Heltsley7, D. Hertz7, L. Hsu7, C. D. Jones7, J. Kandaswamy7, D. L. Kreinick7, V. E. Kuznetsov7, H. Mahlke-Krüger7, T. O. Meyer7, P. U. E. Onyisi7, J. R. Patterson7, D. Peterson7, J. Pivarski7, D. Riley7, A. Ryd7, A. J. Sadoff7, H. Schwarthoff7, M. R. Shepherd7, S. Stroiney7, W. M. Sun7, J. G. Thayer7, D. Urner7, T. Wilksen7, M. Weinberger7, S. B. Athar8, P. Avery8, L. Breva-Newell8, R. Patel8, V. Potlia8, H. Stoeck8, J. Yelton8, P. Rubin9, C. Cawlfield10, B. I. Eisenstein10, G. D. Gollin10, I. Karliner10, D. Kim10, N. Lowrey10, P. Naik10, C. Sedlack10, M. Selen10, J. J. Thaler10, J. Williams10, J. Wiss10, K. W. Edwards11, D. Besson12, T. K. Pedlar13, D. Cronin-Hennessy14, K. Y. Gao14, D. T. Gong14, Y. Kubota14, B. W. Lang14, S. Z. Li14, R. Poling14, A. W. Scott14, A. Smith14, C. J. Stepaniak14, S. Dobbs15, Z. Metreveli15, K. K. Seth15, A. Tomaradze15, P. Zweber15, J. Ernst16, A. H. Mahmood16, K. Arms17, K. K. Gan17, H. Severini18, D. M. Asner19, S. A. Dytman19, W. Love19, 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, I. P. J. Shipsey21, G. S. Adams22, M. Chasse22, M. Cravey22, J. P. Cummings22, I. Danko22, J. Napolitano22, C. S. Park23, W. Park23, J. B. Thayer23, E. H. Thorndike23, T. E. Coan24, Y. S. Gao24, F. Liu24, and R. Stroynowski24 (CLEO Collaboration)
1Syracuse University, Syracuse, New York 13244, USA
2Vanderbilt University, Nashville, Tennessee 37235, USA
3Wayne State University, Detroit, Michigan 48202, USA
4California Institute of Technology, Pasadena, California 91125, USA
5Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
6Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
7Cornell University, Ithaca, New York 14853, USA
8University of Florida, Gainesville, Florida 32611, USA
9George Mason University, Fairfax, Virginia 22030, USA
10University of Illinois, Urbana-Champaign, Illinois 61801, USA
11Carleton University, Ottawa, Ontario K1S 5B6, Canada and the Institute of Particle Physics, Canada
12University of Kansas, Lawrence, Kansas 66045, USA
13Luther College, Decorah, Iowa 52101, USA
14University of Minnesota, Minneapolis, Minnesota 55455, USA
15Northwestern University, Evanston, Illinois 60208, USA
16State University of New York at Albany, Albany, New York 12222, USA
17Ohio State University, Columbus, Ohio 43210, USA
18University of Oklahoma, Norman, Oklahoma 73019, USA
19University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
20University of Puerto Rico, Mayaguez, Puerto Rico 00681, USA
21Purdue University, West Lafayette, Indiana 47907, USA
22Rensselaer Polytechnic Institute, Troy, New York 12180, USA
23University of Rochester, Rochester, New York 14627, USA
24Southern Methodist University, Dallas, Texas 75275, USA
Received 19 November 2004; published 25 January 2005
We have studied the inclusive photon spectra in Υ(2S) and Υ(3S) decays using a large statistics data sample obtained with the CLEO III detector. We present the most precise measurements of electric dipole (E1) photon transition rates and photon energies for Υ(2S)→γχbJ(1P) and Υ(3S)→γχbJ(2P) (J=0, 1, 2). We measure the rate for a rare E1 transition Υ(3S)→γχb0(1P) for the first time. We also set upper limits on the rates for the hindered magnetic dipole (M1) transitions to the ηb(1S) and ηb(2S) states.
©2005 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevLett.94.032001
DOI: 10.1103/PhysRevLett.94.032001
PACS: 14.40.Gx, 13.20.Gd
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