1999/07/16 by P. V. Landshoff, P V Landshoff, Landshoff, P V
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/9907392
8 pages, plain tex, with 6 figures embedded using epsf. Lecture at Workshop on New Trends in HERA Physics, Ringberg (june 1999)
arxiv created 1999/07/16 · openalex publication_date 1999/07/16 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
Regge theory provides an excellent description of small-x structure-function data from Q2=0 up to the highest available values. The large-Q2 data should also be described by perturbative QCD: the two descriptions must agree in the region where they overlap. However, at present there is a serious lack in our understanding of how to apply perturbative QCD at small x. The usual lowest-order or next-to-lowest order expansion is not valid, at least not until Q2 becomes much larger than is usually assumed; a resummation is necessary, but as yet we do not know how to do this resummation.