2002
article
Study of two photon transistions in CLEO-III Upsilon (3S) data
D. Cinabro, D. L. Hartill, C. J. Stepaniak, H. Kagan, H. Schwarthoff, S. Nam, L. Breva-Newell, P. S. Drell, Helmut Vogel, B. K. Heltsley, Jim Pivarski, G. Tatishvili, D. Cronin-Hennessy, R. Stroynowski, F. Wappler, G.P. Chen, C.L. Plager, I. Karliner, Roy A. Briere, N. Lowrey, F. Liu, Haipeng An, Xiaojian Zhao, Robert E. Kass, E. Dambasuren, A. Bornheim, G. W. Brandenburg, K. W. Edwards, J. E. Duboscq, G. H. A. Viehhauser, D. Urner, P. Zweber, T. Wilksen, J. Lee, Nari B. Mistry, D. G. Cassel, J. Kandaswamy, Ian P. J. Shipsey, S. McGee, V. Potlia, Elliot Lipeles, S. P. Pappas, Ronald A. Poling, Terry L. Hart, E. H. Thorndike, S.Z. Li, S. A. S. Ahmed, V. Boisvert, M. Dubrovin, Rupak Mahapatra, H. Stoeck, Edward I. Shibata, R. Mountain, T. K. Pedlar, V. Pavlunin, P. Avery, L. Jian, C. D. Jones, C. Sedlack, A. J. Sadoff, T. E. Coan, Y. S. Gao, P. Skubic, C. Boulahouache, S. J. Richichi, Sheldon L. Stone, T. Skwarnicki, Justin Williams, Y. Maravin, W. M. Sun, A. J. R. Weinstein, A. L. Lyon, J.C. Wang, Steven E. Csorna, R. J. Wilson, J. B. Thayer, H. Severini, Sydney Anderson, Hajime Muramatsu, David A. Peterson, S. Dytman, J.W. Hinson, Muzammal Saleem, E. A. Eckhart, Lauren Hsu, K. Khroustalev, Bob I. Eisenstein, Emery Nordberg, J. A. Ernst, I. Dankó, D. Besson, M. M. Zoeller, Jon Urheim, S. W. Gray, David S. Riley, V. V. Frolov, Romain Ould Ammar, A.J. Magerkurth, A. Warburton, A. M. Shapiro, R. M. Hans, N. Adam, Richard D. Ehrlich, M. R. Shepherd, K. Benslama, A. J. S. Smith, Chul S. Gwon, L. Gibbons, M. Selen, S.J. Lee, G. D. Gollin, Karl Berkelman, W. Park, A.H. Mahmood, S. B. Athar, K. Honscheid, J. Mueller, T. Ferguson, H. Mahlke-Krüger, M. Weinberger, V. Savinov, J.G. Thayer, J. J. Thaler, K. M. Ecklund, C.S. Park, B. Gittelman, E. von Toerne, Y. Kubota, M. Artuso, Z. Metreveli, K. K. Gan, K. Bukin, David Harry Miller, S. Chen, R.S. Galik, A. Tomaradze, R. Nandakumar, K. K. Seth, T.O. Meyer, D.Y.J. Kim, Dirk Hufnagel, J. Yelton, D. L. Kreinick
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Le résumé fourni par la source
We have studied two-photon transitions from Upsilon(3S) decays recorded by the CLEO-III detector in exclusive events with two photons and either two electrons or two muons. We obtain precision measurements of the chi_b(2P_J) masses for J=2 and J=1. The transition rates for all three spin states of the 2P triplet are measured with improved precision which leads to a better determination of their hadronic width ratios. We also observe rare transitions via the chi_b(1P) states. The measured rates for these transitions allow a determination of <1P|r|3S>, the E1 matrix element, which is more sensitive to the structure of the bb states than the <2P|r|3S> matrix element which dominates the radiative decays of the Upsilon(3S) state. We also present first upper limits on the branching ratios for Upsilon(3S)-> pi0 Upsilon(2S) Upsilon(3S) -> pi0 Upsilon(1S) and a new limit for the branching ratio for Upsilon(3S) -> eta Upsilon(1S).
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Les sujets associés
Nuclear Physics and ApplicationsMethane Hydrates and Related PhenomenaAtomic and Subatomic Physics Research