2006/07/31 by O. Linnyk, Stefan Leupold, S. Leupold +1 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevd.75.014016
published as Phys.Rev.D75:014016,2007 · v2: shortened, references added, typos corrected
arxiv created 2006/11/20 · openalex publication_date 2007/01/19 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We calculate the effects of next-to-leading order perturbative QCD as well as of the quark transverse motion and off-shellness on the Drell-Yan process cross section. By studying the s\ensuremath→\ensuremath∞ behavior of the cross section in these approaches, we find that the effects of quark off-shellness and intrinsic-kT parametrize those of higher twists. In particular, the off-shellness of partons generates part of the K-factor type corrections to the leading order cross section. Higher-twist contributions to the pT-spectrum of the Drell-Yan pairs are found to be large for presently accessible energies. The evolution of quark off-shellness distribution with the hard scale is also studied.