2006/05/31 by A. Brandenburg, A. Ringwald, A. Utermann +1
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #hep-th
paper · pdf · doi:10.1016/j.nuclphysb.2006.07.020
published as Nucl.Phys. B754 (2006) 107-126 · 24 pages, 9 figures, some comments added; to appear in Nuclear Physics B
arxiv created 2006/07/25 · openalex publication_date 2006/08/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We consider QCD instanton-induced contributions to lepton pair production in hadron-hadron collisions. We relate these contributions to those known from deep inelastic scattering and demonstrate that they can be calculated reliably for sufficiently large momentum transfer. We observe that the instanton contribution to the angular distribution of the lepton pairs at finite momentum transfer strongly violates the Lam-Tung relation - a relation between coefficient functions of the angular distribution which is valid within the framework of ordinary perturbation theory. The drastic violation of this relation, as seen in experimental data, might be related to such instanton-induced effects.