Cherenkov Glue in Opaque Nuclear Medium

TL;DR

This paper calculates the spectrum of Cherenkov gluons in nuclear media using in-medium QCD, compares it with RHIC data, and extracts nuclear permittivity parameters, highlighting the importance of resonance effects for data agreement.

Contribution

It introduces a calculation of Cherenkov gluons spectrum in nuclear medium within in-medium QCD and fits experimental data to determine nuclear permittivity.

Findings

Real and imaginary parts of nuclear permittivity are extracted from data.

Resonance-like production effects are crucial for matching experimental observations.

The model explains the double-humped structure around away-side jets at RHIC.

Abstract

The spectrum of Cherenkov gluons is calculated within the framework of in-medium QCD. It is compared with experimental data on the double-humped structure around the away-side jet obtained at RHIC. The values of the real and imaginary parts of the nuclear permittivity are obtained from these fits. It is shown that accounting for an additional smearing due to resonance-like production of final hadrons allows to achieve an agreement with experimental data.