Colour fields of the static hybrid gluon-quark-antiquark system

TL;DR

This study uses lattice QCD to analyze the color fields in a static gluon-quark-antiquark system, exploring flux tube structures and confinement mechanisms in different geometries.

Contribution

It provides a detailed lattice QCD analysis of the color fields in hybrid systems, comparing flux tube models and investigating Casimir scaling.

Findings

Flux tube structures depend on geometry.

Casimir scaling observed in microscopic analysis.

Differences between fundamental and adjoint confining strings.

Abstract

The colour fields, created by a static gluon-quark-antiquark system, are computed in quenched SU(3) lattice QCD, in a $24^3\times 48$ lattice at $\beta=6.2$ and $a=0.07261(85)\,fm$. We study two geometries, one with a U shape and another with an L shape. The particular cases of the two gluon glueball and quark-antiquark are also studied, and the Casimir scaling is investigated in a microscopic perspective. This also contributes to understand confinement with flux tubes and to discriminate between the models of fundamental versus adjoint confining strings, analogous to type-II and type-I superconductivity.