Two photon width of eta_c

Details Two photon width of eta_c Two photon width of eta_c

2001-10-16

arxiv.org/abs/hep-ph/0110211v1

Eur.Phys.J. C25 (2002) 421-425

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 Pages, 1 figure, use ws-p8-50x6-00.cls. To appear in the proceedings of the Photon 2001 Conference on The Structure and Inte

Scientific paper

We discuss the measured partial width of the pseudoscalar charmonium state, $\eta_c$, into two photons. Predictions from potential models are examined and compared with experimental values. Including radiative corrections, it is found that present measurements are compatible both with a QCD type potential and with a static Coulomb potential, with $\alpha_s$ evaluated at two loops. Results are also compared with those from $\jpsi$ data through the NRQCD model.

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