ar X iv : h ep - p h / 02 04 21 4 v 1 1 8 A pr 2 00 2 Two Photon Width of η c
نویسنده
چکیده
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. The latter is then used to give an estimate on the ηb decay into two photons. Results for ηc are also compared with those from J/ψ data through the NRQCD model.
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تاریخ انتشار 2002