Two-loop Correction to the Leptonic Decay of Quarkonium

Details Two-loop Correction to the Leptonic Decay of Quarkonium Two-loop Correction to the Leptonic Decay of Quarkonium

1997-12-08

arxiv.org/abs/hep-ph/9712302v1

Phys.Rev.lett.80:2535-2538,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, LaTeX, 1 figure included via epsf.sty

Scientific paper

10.1103/PhysRevLett.80.2535

Applying asymptotic expansions at threshold, we compute the two-loop QCD
correction to the short-distance coefficient that governs the leptonic decay
$\psi\to l^+ l^-$ 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.

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