Magnetic and electric contributions to the energy loss in a dynamical QCD medium

TL;DR

This paper investigates the magnetic and electric contributions to energy loss in a dynamical QCD medium, revealing that magnetic effects are responsible for the increased energy loss compared to static media, especially at finite energies.

Contribution

It provides a detailed analysis of magnetic and electric contributions to energy loss in dynamical QCD media, highlighting the magnetic contribution as the key factor for higher energy loss.

Findings

Magnetic contribution causes higher energy loss in dynamical medium.

At high energies, static and dynamical media yield similar energy loss values.

The physical origins of energy loss differ between static and dynamical media.

Abstract

The computation of radiative energy loss in a finite size QCD medium with dynamical constituents is a key ingredient for obtaining reliable predictions for jet quenching in ultra-relativistic heavy ion collisions. It was previously shown that energy loss in dynamical QCD medium is significantly higher compared to static QCD medium. To understand this difference, we here analyze magnetic and electric contributions to energy loss in dynamical QCD medium. We find that the significantly higher energy loss in the dynamical case is entirely due to appearance of magnetic contribution in the dynamical medium. While for asymptotically high energies, the energy loss in static and dynamical medium approach the same value, we find that the physical origin of the energy loss in these two cases is different.