Charmonium properties in a screened potential model

There are various nonrelativistic potential models proposed to understand the quarkonium spectra. The specific form of the QCD potential in the whole range of distances is not known. The presence of sea quarks slows down the running of the QCD coupling as a function of the scale with respect to the quenched approximation. When running the coupling from an infra-red hadronic reference scale down to short distances, the effective Coulomb coupling in presence of sea quarks remains stronger than in the quenched case. In this work, we have investigated the charmonium spectrum in a screened potential model