Ambiguities in the calculation of leptonic decays of excited heavy quarkonium

Abstract

Ambiguities in the calculation of leptonic decays of excited heavy quarkonium Abstract. We point out that the determination of the leptonic decay width of radially-excited quarkonia is strongly dependent on the position of the node typical of these excitations. We suggest that this feature could be related with the longstanding ρ− π puzzle. 

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