Novel spectral broadening from vector--axial-vector mixing in dense matter

TL;DR

This paper investigates how vector and axial-vector mesons mix in dense matter, leading to spectral broadening of the rho meson, which could impact understanding of dense baryonic environments.

Contribution

It provides a detailed analysis of meson mixing effects in dense matter and demonstrates spectral broadening due to vector-axial-vector interactions.

Findings

Enhanced vector spectral function below rho mass

Spectral broadening observed at small three-momenta

Mixing effects significant in dense baryonic matter

Abstract

In this write-up we summarize main result of our recent analysis on the mixing between transverse $\rho$ and $a_1$ mesons through a set of $\omega\rho a_1$-type interactions in dense baryonic matter. In the analysis, we showed that a clear enhancement of the vector spectral function appears below $\sqrt{s}=m_\rho$ for small three-momenta of the $\rho$ meson, and thus the vector spectrum exhibits broadening.