Hard Diffraction with Dynamic Gap Survival

TL;DR

This paper introduces a new Pythia 8-based framework for modeling hard diffraction in proton-proton and proton-antiproton collisions, incorporating a dynamic gap survival factor to improve event description.

Contribution

It extends the Ingelman-Schlein approach by adding a dynamic gap survival factor from multiparton interactions, addressing non-universality between HERA and Tevatron data.

Findings

Improved description of single diffractive events in pp and ppbar collisions.

Implementation in Pythia 8 enables comprehensive modeling of diffractive processes.

Addresses non-universality of diffraction between ep and hadron-hadron collisions.

Abstract

We present a new framework for the modelling of hard diffraction in pp and ppbar collisions. It starts from the the approach pioneered by Ingelman and Schlein, wherein the single diffractive cross section is factorized into a Pomeron flux and a Pomeron PDF. To this it adds a dynamically calculated rapidity gap survival factor, derived from the modelling of multiparton interactions. This factor is not relevant for diffraction in ep collisions, giving non-universality between HERA and Tevatron diffractive event rates. The model has been implemented in Pythia 8 and provides a complete description of the hadronic state associated with any hard single diffractive process. Comparisons with ppbar and pp data reveal improvement in the description of single diffractive events.