Quark Pair Production in Expanding Glasma

TL;DR

This paper investigates quark pair production in expanding glasma fields using a simplified massless QED model, revealing how the electric field diminishes over time with plasma oscillations in an expanding context.

Contribution

It provides explicit solutions for the temporal evolution of electric fields and quark pair production in expanding glasma, extending previous non-expanding analyses.

Findings

Electric field decreases with plasma oscillation in expanding glasma

Explicit solutions for field behavior in $ au$ and $ta$ coordinates

Massless QED used as a simplified model for QCD processes

Abstract

Glasma in high energy heavy ion collisions is longitudinal classical color electric and magnetic fields. The color electric field has been shown to produces quark and anti-quark pairs by the Schwinger mechanism and to oscillate with time in non-expanding glasma, that is, plasma oscillation. On the other hand, in the expanding glasma we show that the field decreases with the plasma oscillation. We can explicitly obtain the solutions representing such temporal behaviors in the system with $\tau$ and $\eta$ coordinates. We show these results by using massless QED as a simplified model of QCD.