Hard diffraction in hadron--hadron interactions and in photoproduction

TL;DR

<3-5 sentence high-level summary describing the problem, approach, and findings> The paper addresses hard diffraction in hadron-hadron and photoproduction by employing the triple--Pomeron framework and Regge-factorized Pomeron structure functions to construct Pomeron PDFs, which are then evolved with LO QCD. A Monte Carlo implementation within the two-component Dual Parton Model samples hard diffractive events, including gamma-proton and proton-antiproton collisions, and predicts jet observables and cross-section ratios under UA8-like cuts. The quark components of the Pomeron are normalized via $F_2^{IP}$, while the gluon component is modeled with the form $x f_g^{IP}(x,Q_0^2;t) = K(Q_0^2,t) x(1-x)$ and evolved to higher scales; the framework provides a testbed for Pomeron structure and factorization in diffraction. The results show reasonable agreement with available photoproduction data shapes and offer predictions for hadronic diffraction that can be confronted with future measurements.

Abstract

Hard single diffractive processes are studied within the framework of the triple--Pomeron approximation. Using a Pomeron structure function motivated by Regge--theory we obtain parton distribution functions which do not obey momentum sum rule. Based on Regge-- factorization cross sections for hard diffraction are calculated. Furthermore, the model is applied to hard diffractive particle production in photoproduction and in $p\bar{p}$ interactions.