| Autor: |
A. Liberman, Hermann Kolanoski, I. Kirkbride, R. Partridge, K. Strauch, C. W. Peck, F. Bulos, H. F.W. Sadrozinski, J. Gaiser, M. J. Oreglia, K. Wacker, R. Chestnut, C. Kiesling, R. Hofstadter, D. Aschman, J. O'Reilly, T. H. Burnett, M. Richardson, Matteo Cavalli-Sforza, Elliott D. Bloom, D. C. Coyne, G.L. Godfrey, F. C. Porter, W. Kollman, J. Tompkins |
| Rok vydání: |
1980 |
| Předmět: |
|
| Zdroj: |
Physical Review Letters. 44:712-716 |
| ISSN: |
0031-9007 |
| Popis: |
The decay $\frac{J}{\ensuremath{\psi}}$ into $3\ensuremath{\gamma}$ final states has been studied. No evidence is found for the existence of the $X(2.83)$ or any heavy narrow state (e.g., the ${\ensuremath{\eta}}_{c}$) decaying into two photons. Upper limits are given on the branching ratio $\frac{J}{\ensuremath{\psi}}\ensuremath{\rightarrow}{\ensuremath{\eta}}_{c}$, ${\ensuremath{\eta}}_{c}\ensuremath{\rightarrow}2\ensuremath{\gamma}$ for ${\ensuremath{\eta}}_{c}$ masses in the 2.7-3.0-GeV region. In addition, the branching ratios $\frac{J}{\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\eta}}$, $\ensuremath{\gamma}{\ensuremath{\eta}}^{\ensuremath{'}}$ are measured. It is found that the ${\ensuremath{\eta}}^{\ensuremath{'}}$ branching ratio is higher than previously reported. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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