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Paper detail

Two Photon Width of eta_c (paper version)

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.

preprint2002arXivOpen access
Nicola FabianoGiulia Pancheri
hep-ph
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Nicola FabianoGiulia Pancheri

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