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Two-loop Correction to the Leptonic Decay of Quarkonium
Applying asymptotic expansions at threshold, we compute the two-loop QCD correction to the short-distance coefficient that governs the leptonic decay relation between the quarkonium non-relativistic wave function at the origin and the quarkonium decay constant in full QCD.
| Autores principales: | , , |
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| Lenguaje: | eng |
| Publicado: |
1997
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1103/PhysRevLett.80.2535 http://cds.cern.ch/record/340364 |