Double parton scattering: Impact of nonperturbative parton correlations

TL;DR

This paper investigates how nonperturbative and perturbative parton correlations influence double parton scattering in proton-proton collisions, revealing significant corrections and the importance of color fluctuations, aligning with experimental data.

Contribution

It introduces a phenomenological approach combining nonperturbative and perturbative correlations to better understand DPS and its effective cross section.

Findings

Nonperturbative correlations significantly affect the DPS cross section.

Color fluctuations impact the rate and mechanisms of DPS.

The combined effects produce weak energy and momentum dependence consistent with experiments.

Abstract

We apply the phenomenological Reggeon Field Theory framework to investigate the relative importance of perturbative and nonperturbative multiparton correlations for the treatment of double parton scattering (DPS) in proton-proton collisions. We obtain a significant correction to the so-called effective cross section for DPS due to nonperturbative parton splitting. When combined with the corresponding perturbative contribution, this results in a rather weak energy and transverse momentum dependence of the effective cross section, in agreement with experimental observations at the Tevatron and the Large Hadron Collider. In addition, we observed that color fluctuations have a sizable impact on the calculated rate of double parton scattering and on the relative importance of the perturbative parton splitting mechanism.