Charmonium decays: J/psi --> e+e- and eta_c --> gamma gamma

Details Charmonium decays: J/psi --> e+e- and eta_c --> gamma gamma Charmonium decays: J/psi --> e+e- and eta_c --> gamma gamma

2001-09-06

arxiv.org/abs/hep-ph/0109054v1

Phys.Lett. B519 (2001) 212-218

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages

Scientific paper

10.1016/S0370-2693(01)01129-7

We compute the O(alpha_s^2) correction to the decay rate eta_c --> gamma gamma and discuss its implications for precision quarkonium physics. We study the suitability of the ratio Gamma(J/psi --> e+e-)/Gamma(eta_c --> gamma gamma), in which the non-perturbative or soft effects cancel at O(alpha_s^{0,1}), for extracting fundamental parameters of QCD at low energies. We show that the QCD-based theory of charmonia is not capable of predicting this ratio with any degree of confidence.

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