2008/09/01 by B. I. Ermolaev, Ermolaev, B. I., S. I. Troyan +1 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.0809.0219
Talk given at the conference "Hadron Structure and QCD-2008", Gatchina, Russia, June 30-July 4, 2008
arxiv created 2008/09/01 · openalex publication_date 2008/09/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We examine the parametrization of the QCD coupling in the Bethe-Salpeter equations for the hard and Regge processes and determine the argument of alphas of the factorized gluon. Our analysis shows that for the hard processes alphas = alphas(k2T/(1- beta)) where k2T and beta are the longitudinal and transverse moment of the soft parton. On the other hand, in the Regge processes alphas = alphas(k2T/beta). We have also shown that the well-known parametrization alphas = alphas(k2T) in the DGLAP equations stands only if the lowest integration limit, mu2, over k2T (the starting point of the Q2 -evolution) obeys the relation mu >> LambdaQCD exp (π/2), otherwise the coupling should be replaced by the more complicated expression.