Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Total and Jet Photoproduction Cross Sections at HERA   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)

1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn