Two Photon Width of etac (paper version)
Abstract
We discuss the measured partial width of the pseudoscalar charmonium state etac 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 etab decay into two photons. Results for etac are also compared with those from j/psi data through the NRQCD model.
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