| Autor: |
J. P. Cummings, D. Z. Besson, T. K. Pedlar, N. Lowrey, J. Insler, Marina Artuso, P. Naik, R. Gray, D. Cinabro, C. D. Jones, B. Xin, E. H. Thorndike, Amiran Tomaradze, Karl Berkelman, H. Muramatsu, Hans J. Vogel, Junjie Chen, O. Aquines, D. Cronin-Hennessy, I. Danko, C. Cawlfield, G. Bonvicini, C. Sedlack, S. Mehrabyan, J. C. Wang, K. Y. Gao, J. P. Alexander, James E Wiss, Z. Li, Z. Metreveli, Sheldon Stone, Anders Ryd, A. Lincoln, D. G. Cassel, V. Potlia, M. R. Shepherd, Juliet Ritchie Patterson, R. Redjimi, L. K. Gibbons, N. E. Adam, B. K. Heltsley, R. S. Galik, C. S. Park, J. E. Ramirez, S. B. Athar, R. Patel, D. Hertz, H. Mendez, Kamal K. Seth, L. Fields, Mats A Selen, D. L. Kreinick, Thomas Ferguson, V. E. Kuznetsov, E. J. White, Dong-Hyun Kim, A. J. Sadoff, J. A. Ernst, Y. S. Gao, I. P.J. Shipsey, M. E. Watkins, T. Wilksen, J. Kandaswamy, X. Shi, S. A. Dytman, T. E. Coan, S. Stroiney, G. S. Huang, V. Savinov, Horst Severini, I. Karliner, John Yelton, D. Peterson, Jonathan L. Rosner, Tomasz Skwarnicki, J. Hietala, T. Klein, J. Pivarski, Li Jingyuan, K. Randrianarivony, D. T. Gong, D. L. Hartill, Peter K. Zweber, F. Liu, M. Anderson, B. I. Eisenstein, Werner Sun, R. Ehrlich, S. W. Gray, N. Menaa, K. M. Ecklund, H. Stoeck, A. Lopez, W. Love, R. A. Briere, H. Mahlke-Krüger, S. Nisar, Sean A Dobbs, K. W. Edwards, Peter Onyisi, S. Blusk, B. Sanghi, J. E. Duboscq, R. Poling, Q. He, D. M. Asner, V. Pavlunin, R. Mountain, A. W. Scott, H. Schwarthoff, D. Riley, M. Dubrovin, I. C. Brock, Yuichi Kubota, M. Weinberger, G. S. Adams, S. E. Csorna, K. Zhang, B. W. Lang, D. H. Miller, P. Rubin, R. Sia, J. Butt, J. Napolitano, A. Smith, G. Tatishvili, T. O. Meyer |
| Rok vydání: |
2007 |
| Předmět: |
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| Zdroj: |
Physical Review D. 76 |
| ISSN: |
1550-2368
1550-7998 |
| Popis: |
We report on a search for the radiative decay of {upsilon}(1S) to the pseudoscalar mesons {eta} and {eta}{sup '} in (21.2{+-}0.2)x10{sup 6} {upsilon}(1S) decays collected with the CLEO III detector at the Cornell Electron Storage Ring. The {eta} meson was reconstructed in the three modes {eta}{yields}{gamma}{gamma}, {eta}{yields}{pi}{sup +}{pi}{sup -}{pi}{sup 0}, or {eta}{yields}{pi}{sup 0}{pi}{sup 0}{pi}{sup 0}. The {eta}{sup '} meson was reconstructed in the mode {eta}{sup '}{yields}{pi}{sup +}{pi}{sup -}{eta} with {eta} decaying through any of the above three modes, and also {eta}{sup '}{yields}{gamma}{rho}{sup 0}, where {rho}{sup 0}{yields}{pi}{sup +}{pi}{sup -}. Five out of the seven submodes are found to have very low backgrounds. In four of them we find no signal candidates and in one [{upsilon}(1S){yields}{gamma}{eta}{sup '}, {eta}{sup '}{yields}{pi}{sup +}{pi}{sup -}{eta}, {eta}{yields}{pi}{sup +}{pi}{sup -}{pi}{sup 0}] there are two good signal candidates, which is insufficient evidence to claim a signal. The other two submodes ({eta}{yields}{gamma}{gamma} and {eta}{sup '}{yields}{gamma}{rho}) are background limited, and show no excess of events in their signal regions. We combine the results from different channels and obtain upper limits at the 90% C.L. which are B({upsilon}(1S){yields}{gamma}{eta}) |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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