Pion electromagnetic form factor at finite density

TL;DR

This paper investigates how the electromagnetic form factor of the pion and the rho-meson mass are affected by finite density conditions using an effective chiral action derived from the instanton QCD vacuum, revealing a significant rho-meson mass reduction.

Contribution

It introduces a novel approach using an effective chiral action from the instanton QCD vacuum to study mesonic property modifications at finite density.

Findings

Rho-meson mass decreases by about 10% at finite density

Results align with QCD sum rule and Brown-Rho estimates

Provides theoretical insights into medium modifications of mesons

Abstract

In this talk, we introduce an effective chiral action, derived from the instanton QCD vacuum configuration, in order to study the modification of mesonic properties in medium. We present our recent theoretical results on the electromagnetic from factor and rho-meson mass shift at finite density. We observe that the rho-meson mass is dropped by about 10%: m*_rho/m_rho ~ 1-0.12 mu_B/mu_0, which is compatible with that estimated by the QCD sum rule as well as by Brown and Rho.