2002/10/07 by J Lamouroux, J. Lamouroux, R. Peschanski +5
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/s0550-3213(02)01013-1
published as Nucl.Phys.B649:312-326,2003 · 14 pages, 9 figures
arxiv created 2002/10/07 · openalex publication_date 2002/12/28 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We ask the question whether the quark and gluon distributions in the Pomeron obtained from QCD fits to hard diffraction processes at HERA can be dynamically generated from a state made of ``valence-like'' gluons and sea quarks as input. By a method combining backward Q2-evolution for data exploration and forward Q2-evolution for a best fit determination, we find that the diffractive structure functions published by the H1 collaboration at HERA can be described by a simple ``valence-like'' input at an initial scale of order mu2 ~ 2.3-2.7 GeV2. The parton number sum rules at the initial scale mu2 for the H1 fit gives 2.1± .1± .1 and .13± .01 ± .02 for gluon and sea quarks respectively, corresponding to an initial Pomeron state made of (almost) only two gluons. It has flat gluon density leading to a plausible interpretation in terms of a gluonium state.