Quark-antiquark Scattering Phase Shift and Meson Spectral Function in Pion Superfluid

TL;DR

This paper investigates how pion superfluidity affects quark-antiquark interactions and meson spectral properties using the NJL model, revealing significant changes in phase shifts and spectral functions due to meson mixing.

Contribution

It provides a detailed analysis of meson spectral functions and phase shifts in pion superfluid, highlighting the impact of meson mixing on these properties.

Findings

Meson spectral functions are significantly spread due to meson mixing.

The scattering phase shift undergoes dramatic changes in the pion superfluid.

Collective modes exhibit altered spectral characteristics in the superfluid phase.

Abstract

We study the quark-antiquark scattering phase shift and meson spectral function in the pion superfluid described by the Nambu--Jona-Lasinio model. The meson mixing in the pion superfluid changes dramatically the full scattering phase shift and spreads strongly the spectral function of some of the collective modes.