Soft diffraction at the LHC: a partonic interpretation

TL;DR

This paper introduces a comprehensive, partonic interpretation-based model for soft proton-proton interactions at high energies, accurately describing various cross sections and predicting a total cross section of about 90 mb at the LHC.

Contribution

It presents a new model incorporating multi-Pomeron vertices and multichannel eikonal scattering with a simple partonic interpretation, improving predictions of soft interaction cross sections.

Findings

Model describes total, elastic, and dissociative cross sections across energies.

Including multi-Pomeron vertices reduces absorptive effects.

Predicts a total cross section of approximately 90 mb at the LHC.

Abstract

We present a `new generation' model for high energy proton-proton `soft' interactions. It allows for a full set of multi-Pomeron vertices, as well as including multichannel eikonal scattering. It describes the behaviour of the proton-proton total, sigma(total), and elastic dsigma(el)/dt, cross sections together with those for low and high mass proton dissociation. Although the model contains a comprehensive set of multi-Pomeron diagrams, it has a simple partonic interpretation. Including the more complicated multi-Pomeron vertices reduces the absorptive effects as compared to the predictions in which only the triple-Pomeron vertex is considered. Tuning the model to describe the available `soft' data in the CERN ISR - Tevatron energy range, we predict the total, elastic, single- and double-diffractive dissociation cross sections at the LHC energy. An inescapable consequence of including multichannel eikonal and multi-Pomeron effects is that the total cross section is expected to be lower than before: indeed, we find sigma(total) \simeq 90 mb at the LHC energy. We also present differential forms of the cross sections. In addition we calculate soft diffractive central production.