Phenomenological implications of the nucleon's meson cloud

TL;DR

This paper explores how the nucleon's meson cloud influences its structure and investigates the potential intrinsic charm component, emphasizing theoretical understanding and recent global QCD analysis results.

Contribution

It provides a detailed analysis of the nucleon's meson cloud effects and examines the intrinsic charm component using a light-front model and recent global QCD data.

Findings

Enhanced understanding of pion-nucleon vertex

Insights into intrinsic charm from global QCD analysis

Implications for nucleon structure models

Abstract

The long-distance structure of the interacting nucleon receives important contributions from its couplings to light hadronic degrees of freedom -- a light meson cloud -- while an analogous nonperturbative mechanism is expected to generate an intrinsic charm (IC) component to the proton wavefunction. We investigate both possibilities, keeping for the former a special eye to improving the theoretical understanding of the pion-nucleon vertex in light of proposed measurements. Regarding the latter possibility of IC, we highlight recent results obtained by a global QCD analysis of the light-front model proposed in Hobbs et al. (Phys Rev D 89:074008, 2014).