Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-12-18
Phys.Lett.B661:250-258,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 2 figures
Scientific paper
10.1016/j.physletb.2008.02.031
We calculate the $O(\alpha_s)$ and $O(\alpha_s^2)$ gluon radiative corrections to the QCD sum rule for the first Gegenbauer moment $a_1^K$ of the kaon light-cone distribution amplitude. The NNL0 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 $a_1^K(1 \GeV)=0.10\pm 0.04$.
Chetyrkin K. G.
Khodjamirian Alexander
Pivovarov A. A.
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