Deacy of quark-antiquark mesons in NRQCD formalism

摘要

We investigate the decay properties of the quark-antiquark (cc)system using NRQCD formalism. The basic parameters for the decay of the cc states are obtained from phenomenological potential scheme of the type V (r) = a/r +Ar~v , with v varying from 0.5 to 2, which is employed to fit the low lying spectra. The resultant wave function and mass parameters are employed to determine the decay constants fp/v with and without QCD corrections. By incorporating the relativistic corrections of order v~4 to the heavy quarkonium decays into two photons, and the vector state into lepton pairs are computed within the NRQCD formalism. These decay widths are also investigated by incorporating radiative corrections up to the lowest order to the conventional Van Royen- Weisskopf formula. Our theoretical predictions of the decays of the cc meson for the potential index around 0.7 are comparable with other model predictions and with the experimental values.