Quarkonium Mass Splitting Revisited: Effects of Closed Mesonic Channels

Abstract

Modifications of the mass spectrum the quarkonium induced by its virtual dissociation into a pair of heavy mesons is considered. Coupling between quark and mesonic channels results in noticeable corrections to spin-dependent mass splitting. In particular, the observable hierarchy of mass splittings in the c, b and 'b multiplets is reproduced.

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