Eur. Phys. J. C 10, 689-696
DOI 10.1007/s100529900160
Total
p cross section
E. Gotsman - E. Levin - U. Maor - E. Naftali
School of Physics and Astronomy,
Raymond and Beverly Sackler Faculty of Exact Science,
Tel Aviv University,
Tel Aviv, 69978, Israel
Received: 11 April 1999 / Published online: 28 September 1999
Abstract
This paper shows that the approach based on Gribov's ideas for
photon-proton interaction is able to describe the experimental data
over a
wide range of photon virtualities Q2 = 0-100GeV2 and
energies
. A simple model is
suggested which provides
a quantitative way of describing the matching between short and long
distances (between ``soft" and ``hard" processes) in photon-proton
interaction at high energy. The main results of our analysis are: (i)
the values of the separation parameters differentiating
the soft and hard
interactions are determined; (ii) the additive quark model can be used to
calculate
the
soft contribution to the photon-proton interaction; (iii) a
good
description of the ratio
is obtained; and (iv) a
considerable
contribution of the soft process at large Q2, and of
hard processes at small Q2 was found.
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