Zweig-Forbidden Radiative Orthoquarkonium Decays in Perturbative QCD

摘要

We calculate helicity amplitudes and decay rates for Zweig-forbidden radiative decays of a exp 3 S sub 1 (Qanti Q) bound state into exp 1 S sub 0 (qanti q) and exp 3 Psub(J)(qanti q) states in lowest order QCD. We employ a new technique of scalarizing loop integrals by using covariant helicity projectors. Thereby we are able to integrate analytically all occurring loop integrals. When applied to J/psi decays our results are in reasonable agreement with present experimental results. psi' decays will provide a further test of the model. Transitions from bottonium to charmonium are most interesting since there all dynamical assumptions are well satisfied. Unfortunately the transition rates are very small. (ERA citation 08:052719)