Weak Coupling Limit and Genuine QCD Predictions for Heavy Quarkonia
W. Kummer, W. Moedritsch
Abstract
Although individual levels of toponium will be unobservable, the top--anti--top system near threshold fulfills all requirements of a rigorous perturbation theory in QCD for weakly bound systems. Corresponding techniques from positronium may thus be transferred successfully to this case. After clarifying the effect of a non-zero width we calculate the tt potential to be used for the calculation of e.g. the cross-sections near threshold.
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