| Autor: |
Rishi Patel, D. M. Asner, H. Muramatsu, A. Lincoln, D. Mohapatra, Michael T. Anderson, P. Rubin, J. Insler, G. Wilkinson, K. K. Seth, T. K. Pedlar, N. Lowrey, D. Riley, D. Cinabro, Alan D. Lopez, J. E. Duboscq, K. W. Edwards, John Yelton, J. Hietala, D. L. Kreinick, Marina Artuso, R. A. Briere, Sheldon Stone, S. Mehrabyan, R. Ehrlich, M. Dubrovin, J. P. Cummings, M. E. Watkins, G. S. Adams, A. Powell, D. Z. Besson, Anders Ryd, Helmut Vogel, E. H. Thorndike, H. Mahlke-Krüger, M. R. Shepherd, Peter Onyisi, R. Mountain, Yuichi Kubota, Ian Shipsey, V. Savinov, T. Skwarnicki, Mats A Selen, J. E. Ramirez, G. Tatishvili, A. J. Sadoff, H. Mendez, Werner Sun, B. Xin, G. Bonvicini, Q. He, P. Naik, Li Jingyuan, J. P. Alexander, D. G. Cassel, J. Y. Ge, D. L. Hartill, Lei Zhang, K. Y. Gao, I. Karliner, James E Wiss, S. W. Gray, Sean A Dobbs, Peter K. Zweber, J. Ledoux, J. M. Hunt, Thomas Ferguson, R. Poling, Jing Wang, R. E. Mitchell, S. B. Athar, S. Blusk, J. Libby, Juliet Ritchie Patterson, R. S. Galik, B. K. Heltsley, B. W. Lang, B. I. Eisenstein, D. H. Miller, Z. Metreveli, W. Love, E. J. White, J. Kandaswamy, S. Nisar, L. K. Gibbons, D. Hertz, N. Sultana, T. Wilksen, D. Peterson, K. Randrianarivony, J. Napolitano, Amiran Tomaradze, K. M. Ecklund, D. Hu, D. Cronin-Hennessy, F. Yang, I. Danko, J. Reed, Jonas Rademacker, A. W. Scott, C. S. Park, Richard Gray, L. Fields, Xin Shi, Sadia Khalil, S. Stroiney, Jonathan L. Rosner, B. Moziak, V. E. Kuznetsov, T. Klein |
| Rok vydání: |
2009 |
| Předmět: |
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| Zdroj: |
Physical Review Letters. 102 |
| ISSN: |
1079-7114
0031-9007 |
| DOI: |
10.1103/physrevlett.102.011801 |
| Popis: |
Using 24.5 million psi(2S) decays collected with the CLEO-c detector at CESR we present the most precise measurements of magnetic dipole transitions in the charmonium system. We measure B(psi(2S)->gamma eta_c) = (4.32+/-0.16+/-0.60)x10^-3, B(J/psi->gamma eta_c)/B(psi(2S)->gamma eta_c) = 4.59+/-0.23+/-0.64, and B(J/psi->gamma eta_c) = (1.98+/-0.09+/-0.30)%. We observe a distortion in the eta_c line shape due to the photon-energy dependence of the magnetic dipole transition rate. We find that measurements of the eta_c mass are sensitive to the line shape, suggesting an explanation for the discrepancy between measurements of the eta_c mass in radiative transitions and other production mechanisms. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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