Pion-cloud effects in the BSE description of mesons

TL;DR

This paper explores how incorporating pion-cloud effects via unquenching in the Schwinger-Dyson and Bethe-Salpeter framework significantly impacts the spectrum of light mesons, advancing understanding of hadronic resonance contributions.

Contribution

It introduces a non-perturbative continuum approach to include pion-cloud effects in meson and quark descriptions, enhancing the modeling of hadronic resonance contributions.

Findings

Unquenching with pion-cloud effects alters light meson spectra

Back-coupling of pions impacts quark propagator

Significant effects observed in meson spectrum

Abstract

We investigate the effect of including hadronic resonance contributions in the description of light quarks and mesons. To this end we take into account the back-coupling of the pion onto the quark propagator within the non-perturbative continuum framework of Schwinger-Dyson equations (SDE) and Bethe-Salpeter equations (BSE), in essence describing the so-called \emph{pion-cloud}. As a result of our study we find that an unquenching of this form provides for considerable effects in the spectrum of light mesons.