We introduce the minijet cross section, computed from QCD, together with a standard soft component, into a unitarization scheme (eikonal model) and show that most of the increase of the inelastic cross section between CERN ISR and SPS collider energies is due to the soft component. We also show that the main properties of minijet production, observed by the UA1 collaboration, can be understood by the introduction of semihard scattering in the dual parton model.

• Received 29 December 1986

DOI:https://doi.org/10.1103/PhysRevLett.58.2015