The running coupling method with next-to-leading order accuracy and pion, kaon elm form factors

Abstract

The pion and kaon electromagnetic form factors $F_M(Q^2)$ are calculated at the leading order of pQCD using the running coupling constant method. In calculations the leading and next-to-leading order terms in ${\alpha }_S((1-x)(1-y)Q^2)$ expansion in terms of ${\alpha }_S(Q^2)$ are taken into account. The resummed expression for $F_M(Q^2)$ is found. Results of numerical calculations for the pion (asymptotic distribution amplitude) are presented.

Comments: 9 pages, 1 figure