Transverse nucleon structure and multiparton interactions

TL;DR

This paper explores the transverse structure of the nucleon and its impact on multiparton interactions in high-energy collisions, revealing how parton fluctuations and the black disk regime influence particle production at RHIC and LHC.

Contribution

It provides new insights into the transverse nucleon structure, generalized parton distributions, and the effects of the black disk regime on multiparton interactions in high-energy collisions.

Findings

Parton fluctuations affect multiparton interactions.

Black disk regime leads to effective fractional energy losses.

Postselection effects explain forward pion production regularities.

Abstract

The transverse structure of the nucleon as probed in hard exclusive processes plays critical role in the understanding of the structure of the underlying event in hard collisions at the LHC, and multiparton interactions. We summarize results of our recent studies of manifestation of transverse nucleon structure in the hard collisions at the LHC, new generalized parton distributions involved in multiparton interactions, presence of parton fluctuations. The kinematic range where interaction of fast partons of the projectile with the target reach black disk regime (BDR) strength is estimated. We demonstrate that in the BDR postselection effect leads to effective fractional energy losses. This effect explains regularities of the single and double forward pion production in $ dAu$ collisions at RHIC and impacts on the forward physics in $pp$ collisions at the LHC.