Radiative decays of charmonium in a non relativistic quark model with an instanton potential

Charmonia are bound states of a charm and an anticharm quark (cc-bar), and represent an important testing ground for the properties of the strong interaction. We investigate the spectrum and decay rates of charmonium states within the framework of the non relativistic quark model by employing a Coulomb like potential from the perturbative one gluon exchange and the linear confining potential along with the potential derived form instanton vacuum to account for the hyperfine mass splitting of charmonium states. We predict radiative E1, M1, decay rates. Charmonium system is a powerful tool for the study of forces between quarks in QCD in non-perturbative regime