Results on soft and hard diffraction in pp and ¯ pp collisions are reviewed with emphasis on factorization and scaling properties of differential cross sections. While conventional factorization breaks down at high energies, a scaling behavior emerges, which leads to a universal description of diffractive processes in terms of a (re)normalized rapidity gap probability distribution.

Introduction Use of hadron therapy as an advanced radiotherapy technique is increasing. In this method, secondary particles are produced through primary beam interactions with the beam-transport system and the patient’s body. In this study, Monte Carlo simulations were employed to determine the dose of produced secondary particles, particularly neutrons during treatment. Materials and Methods I...

Photon-photon collisions are investigated in the framework of the two-component Dual Parton Model. The model contains contributions from direct, resolved soft and resolved hard interactions. All free parameters of the model are determined in fits to hadronhadron and photon-hadron cross section data. The model is shown to agree well to hadron production data from hadron-hadron and photon-hadron ...

We propose the formulation of a dihadron fragmentation function in terms of parton matrix elements. Under the collinear factorization approximation and facilitated by the cut-vertex technique, the two hadron inclusive cross section at leading order (LO) in e+ eannihilation is shown to factorize into a short distance parton cross section and the long distance dihadron fragmentation function. We ...

It was ­ rst pointed out by Drell & Yan (1970) that parton model ideas developed for deep-inelastic scattering could be extended to certain processes in hadron{hadron collisions. The paradigm process, proposed by Drell & Yan, was the production of a massive lepton pair by quark{antiquark annihilation: the Drell{Yan process (illustrated in ­ gure 1). For the production of a lepton pair of invari...

Quantum Chromodynamica provides a good description of many aspects of high energy hadron-badron collisions, and this will be described, along with some aspects that are not yet understood in QCD. Topics include high ET jet production, direct photon, W, 2, and heavy flavor production, rapidity gaps, and hard diffraction. *Supported by DOE contract through Fermilab contracts. @ 1996 by Michael G....