The unquenched QM

TL;DR

This paper discusses the unquenched quark model (UQM), which incorporates sea quark effects into hadron spectra calculations, including self-energy corrections and hybrid meson effects, enhancing understanding of hadron properties.

Contribution

It introduces an extension of the quark model that explicitly includes sea quark effects and hybrid mesons, improving hadron spectroscopy and decay predictions.

Findings

UQM effectively accounts for meson-meson continuum effects.

Self-energy corrections improve hadron mass predictions.

Hybrid meson effects can be incorporated into the formalism.

Abstract

In this contribution, we briefly analyze the formalism of the unquenched quark model (UQM) and its application to the calculation of hadron spectra with self-energy corrections, due to the coupling to the meson-meson continuum. In the UQM, the effects of $q \bar q$ sea pairs are introduced explicitly into the quark model through a QCD-inspired $^{3}P_0$ pair-creation mechanism. The UQM formalism can be extended to include also the effects of hybrid mesons, i.e. hybrid loops. The main applications to spectroscopy and decays are analyzed.