Two photon width of etac
Nicola Fabiano, Giulia Pancheri
Abstract
We discuss the measured partial width of the pseudoscalar charmonium state, ηc, 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 αs evaluated at two loops. Results are also compared with those from data through the NRQCD model.
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