Nucleon form factors and spin content in a quark-diquark model with a pion cloud

TL;DR

This paper introduces a Poincaré invariant quark-diquark model with a pion cloud that accurately reproduces nucleon electromagnetic form factors and quark-spin contributions, advancing understanding of nucleon structure.

Contribution

It presents a novel nucleon model combining quark-diquark configurations and a pion cloud, consistent with Poincaré invariance, matching experimental data.

Findings

Reproduces measured electromagnetic form factors.

Matches the quark-spin contribution to nucleon angular momentum.

Provides a consistent framework for nucleon structure modeling.

Abstract

We propose a new model of the nucleon in which quark-diquark configurations immersed in a pion cloud are treated in a manner consistent with Poincar\'e invariance. With suitably chosen parameters, the computations employing this model reproduce the measured electromagnetic form factors and the quark-spin contribution to the total nucleon angular momentum.