# Color screening in flux tubes and in the color Coulomb potential from the QCD Field Correlators

## TL;DR

This paper investigates the color electric and magnetic structure of flux tubes in QCD using the Field Correlator method, revealing how screening effects differ between flux tubes and the perturbative potential, and connecting to dual superconductor models.

## Contribution

It provides a detailed analysis of the flux tube structure in QCD through the Field Correlator approach, linking nonperturbative and perturbative regimes and resolving screening contradictions.

## Key findings

- At large distances, flux tube fields resemble dual superconductor models.
- Color field screening is strong within flux tubes but negligible in the perturbative potential.
- Field correlators of the stochastic vacuum describe the entire structure across distances.

## Abstract

Colorelectric and Colormagnetic structure of the flux tubes, connecting heavy quark and antiquark, is investigated in the framework of the Field Correlator method which describes all resulting fields in terms of correlators $D^E$ and $D^E_1$. The latter have been computed via gluelumps, which allows to predict the resulting distribution of color fields $\mathbf{E} (\mathbf{r}),$ and colormagnetic currents $\mathbf{k} (\mathbf{r})$ in the flux tubes. It is shown, that at large distances $r\gg \lambda \approx 0.2$ fm the whole structure of fields and relations between them is similar to that of the dual superconductor theory, but the basic dynamics, including small distances, is given by field correlators of the real stochastic vacuum. The important contradiction between the strong screening of color fields in the width of flux tubes and almost no screening in the perturbative $Q\bar Q$ potential is resolved.