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Colour-octet contributions to exclusive charmonium decays
We investigate the theoretical uncertainties of $P$-wave charmonium decays into two pions, $\chi_{\c J}\rightarrow \pi^+\pi^-$, $\pi^0\pi^0$. Constraining the pion distribution-amplitude from the recent precise data on $F_{\pi\gamma}(Q^2)$, we find an order-of-magnitude discrepancy between data and...
| Autores principales: | , , |
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| Lenguaje: | eng |
| Publicado: |
1996
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1016/S0370-2693(96)01515-8 http://cds.cern.ch/record/312238 |