Kaon Structure in the confining Nambu-Jona-Lasino Model

TL;DR

This paper uses a confining Nambu-Jona-Lasinio model with proper-time regularization to calculate kaon electromagnetic form factors and valence quark distributions, showing good agreement with experimental data and QCD predictions.

Contribution

It introduces a novel application of the confining Nambu-Jona-Lasinio model to kaon structure, incorporating quark confinement effects via proper-time regularization.

Findings

Kaon form factors match experimental data

Valence quark distributions agree with QCD at high Q^2

Model captures nonperturbative QCD effects

Abstract

The elastic electromagnetic form factors in the space-like region and valence quark distribution functions for the K+ meson are calculated using the confining Nambu-Jona-Lasinio model with the help of the proper-time regularization scheme, which simulates quark confinement. In this model framework, the dynamics information on the nonperturbative aspects is obtained from quark propagators and bound state amplitudes via Bethe-Salpeter equations. We found that the results on the kaon form factors and valence quark distribution functions are qualitatively in excellent agreement with the existing kaon data as well as the perturbation QCD prediction at higher $Q^2$.