Two-loop Correction to the Leptonic Decay of Quarkonium

Abstract

Applying asymptotic expansions at threshold, we compute the two-loop QCD correction to the short-distance coefficient that governs the leptonic decay ψ → l+l− of a S-wave quarkonium state and discuss its impact on the relation between the quarkonium non-relativistic wave function at the origin and the quarkonium decay constant in full QCD. PACS Nos.: 13.20… (More)

Topics

2 Figures and Tables

Slides referencing similar topics