Photoproduction Cross Sections at HERA Energies
Abstract
We show that photoproduction cross sections recently measured by ZEUS and H-1 at HERA energies are in agreement with our earlier prediction based on high-energy hadronic structure of the photon in the QCD minijet-type model. We present results of an improved calculation of the photoproduction cross section, in which the soft part, motivated by the Regge theory, is taken to be energy-dependent and the semi-hard hadronic part is carefully eikonalized to take into account for the multiple scatterings and to include the appropriate probability that photon would act hadronicaly. We also show that the extrapolation of our cross section to ultra-high energies, of relevance to the cosmic ray physics, gives significant contribution to the ``conventional'' value, but cannot account for the anomalous muon content observed in the cosmic ray air-showers associated with astrophysical point sources.
Cite
@article{arxiv.hep-ph/9309255,
title = {Photoproduction Cross Sections at HERA Energies},
author = {L. Durand and K. Honjo and R. Gandhi and H. Pi and I. Sarcevic},
journal= {arXiv preprint arXiv:hep-ph/9309255},
year = {2007}
}
Comments
University of Arizona preprint AZPH-TH/93-30, PlainTex, 8 pages, 3 figs. (available upon request as .ps files or via regular mail); (Talk presented by I. Sarcevic at the Workshop on Current Colliders and the Supercollider, Argonne National Laboratory, June 2-5, 1993.)