1999/08/30 by Paul Hoyer, Hoyer, Paul
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.hep-ph/9908501
Talk given at the workshop on Exclusive and Semi-exclusive Processes at High Momentum Transfer, Jefferson Lab, USA, May 1999. 7 pages
arxiv created 1999/08/30 · openalex publication_date 1999/08/30 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
There are indications of a faith transition in QCD: The strong coupling may freeze at a sufficiently low value to make PQCD relevant even in the confining regime. The properties of PQCD at low Q2 depend on the asymptotic field configuration assumed at t=±∞. A change in the iεprescription of the free propagators is equivalent to including quarks and gluons in the initial and final states. Perturbative expansions thus generated are formally as justified as standard PQCD and may turn out to be phenomenologically relevant. I discuss examples of the effects of such propagator modifications in QED and QCD.