Two Photon Width of eta_c (paper version)

Details Two Photon Width of eta_c (paper version) Two Photon Width of eta_c (paper version)

2002-04-18

arxiv.org/abs/hep-ph/0204214v1

Eur.Phys.J.C25:421-425,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 4 figures, latex2e, uses graphicx and cite

Scientific paper

10.1007/s10052-002-0974-2

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. The latter is then used to give an estimate on the eta_b decay into two photons. Results for eta_c are also compared with those from j/psi data through the NRQCD model.

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