Light mesons elm form factor and running coupling effects

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 computations dependence of the mesons distribution amplitudes on the hard scale Q 2 is taken into account. The Borel transform and resummed expression for F M ( Q 2) are found. The effect of the next-to-leading order term in expansion of α S ( λQ 2) in terms of α S ( Q 2) on the pion form factor F π ( Q 2) is discussed, comparison is made with the infrared matching scheme's result.