Modelling of exclusive parton distributions and long-range rapidity correlations for pp collisions at the LHC energy

TL;DR

This paper develops a phenomenological model for soft proton-proton interactions at LHC energies, focusing on exclusive parton distributions, string fusion, and long-range rapidity correlations, with applications to heavy ion collisions.

Contribution

It introduces new Monte Carlo algorithms for modeling exclusive parton distributions and string fusion effects in pp collisions, incorporating energy conservation and rapidity considerations.

Findings

String fusion affects long-range correlations of charged particles.

The model estimates inelastic cross sections and multiplicities consistent with experimental data.

Algorithms are prepared for future heavy ion collision studies.

Abstract

Soft pp interactions are considered in the framework of the phenomenological model with color strings formation. Under the assumption, that the elementary collision is realized as interaction of two color dipoles, the total inelastic cross section and the multiplicity of the charged particles are estimated and used for the parameters fixing. The special attention is given to the modelling of exclusive parton distributions taking into account the energy conservation and fixing the mass center that is necessary for the description of correlations, corresponding Monte Carlo procedures are developed for an arbitrary number of partons in a hadron. The string fusion algorithm in a cross-section plane is developed taking into account the finite rapidity width of strings. In this framework the influence of string fusion effects on long-range correlations of charged particles are estimated. The proposed algorithms are planned to be used for studying of heavy ion collisions.