Towards NNLO accuracy in the QCD sum rule for the kaon distribution amplitude

被引：52

作者：

Chetyrkin, K. G. ^{[2
]}

Khodjamirian, A. ^{[1
]}

Pivovarov, A. A. ^{[1
,3
]}

机构：

[1] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany

[2] Univ Karlsruhe, Inst Theoret Teilchenphys, D-76128 Karlsruhe, Germany

[3] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

来源：

PHYSICS LETTERS B | 2008年 / 661卷 / 04期

关键词：

D O I：

10.1016/j.physletb.2008.02.031

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We calculate the O (alpha(S)) and O (alpha(2)(S)) gluon radiative corrections to the QCD sum rule for the first Gegenbauer moment a(1)(K) of the kaon light-cone distribution amplitude. The NNLO accuracy is achieved for the perturbative term and quark-condensate contributions to the sum rule. A complete factorization is implemented, removing logarithms of s-quark mass from the coefficients in the operator-product expansion. The sum rule with radiative corrections yields a(1)(K) (1 GeV) = 0.10 +/- 0.04. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：250 / 258

页数：9

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