The additive quark model revisited: hadron and photon induced cross-sections

Abstract

The standard additive quark model and the ensuing counting rules are modified to take into account the quark-gluonic content of the Pomeron and of the secondary Reggeons. The result is that a much improved description of $pp,\pi p,\gamma p$ and $\gamma \gamma$ cross-sections is achieved.

Comments: 16 pages (LaTeX), with 9 figures included (eps). Submitted to Eur. Phys. J. C