Total and Jet Photoproduction Cross Sections at HERA

Details Total and Jet Photoproduction Cross Sections at HERA Total and Jet Photoproduction Cross Sections at HERA

1993-05-25

arxiv.org/abs/hep-ph/9305313v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

University of Arizona preprint, AZPH-TH/93-13, PlainTex, 7 pages, 4 figs. (available on request)

Scientific paper

We show that the recent measurements of the total photoproduction cross section at HERA energies [1] are in agreement with our earlier prediction based on high-energy hadronic structure of the photon in the QCD minijet-type model [2]. We discuss 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 hadronic probability of the photon [3]. We 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 [4]. (invited talk presented at QCD Recontres de Moriond 1993)

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