Eur. Phys. J. C 10, 689-696
Total p cross section
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
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.