Two-loop corrections to the leptonic decays of quarkonium

被引：182

作者：

Beneke, M ^{[1
]}

Signer, A

Smirnov, VA

机构：

[1] CERN, Div Theory, CH-1211 Geneva 23, Switzerland

[2] Moscow State Univ, Inst Nucl Phys, Moscow 119889, Russia

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.80.2535

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Applying asymptotic expansions at threshold, we compute the two-loop quantum chromodynamics (QCD) correction to the short-distance coefficient that governs the leptonic decay psi --> l(+)l(-) of an S-wave quarkonium state and discuss its impact on the relation between the quarkonium nonrelativistic wave function at the origin and the quarkonium decay constant in full QCD.

引用

页码：2535 / 2538

页数：4

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