Relativistic Effects in S-Wave Quarkonium Decay
A. P. Martynenko, V. A. Saleev
Abstract
The decay widths of S-wave quarkonia (, ~~and~~ ,) are calculated on the basis of a quasipotential approach. The nontrivial dependence on relative quark motion of decay amplitude is taken into consideration via quarkonium wave function. It is shown that relativistic corrections may be large (10-50 %) and comparable with QCD corrections.
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