The Vacuum Structure of Vector Mesons in QCD

TL;DR

This paper investigates the behavior of vector mesons in two-flavor QCD using a functional renormalization group approach, revealing insights into mass scaling, decoupling, and vector meson dominance without model tuning.

Contribution

It introduces a non-perturbative RG method to study vector meson dynamics in QCD, capturing the transition from quark-gluon to hadronic phases.

Findings

Vector meson masses scale towards the chiral symmetry breaking scale.

Decoupling of mesons occurs at high energies.

Vector meson dominance remains valid across scales.

Abstract

We study the chiral dynamics of vector mesons in two-flavor QCD in vacuum by utilizing a functional renormalization group approach. This allows us to capture the dynamical transition from the quark-gluon phase at high energies to the hadronic phase at low energies without the necessity of model parameter tuning. We use this to analyze the scaling of vector meson masses towards the chiral symmetry breaking scale, the decoupling of the mesons at high energies and the validity of vector meson dominance.