Predictions and postdictions for relativistic lead and oxygen collisions with Trajectum

TL;DR

This paper presents a high-precision global analysis of relativistic heavy ion collisions using Trajectum, providing detailed predictions and comparisons with experimental data, including new insights into oxygen-oxygen collisions and Quark-Gluon-Plasma properties.

Contribution

The paper introduces an enhanced Trajectum analysis framework with improved precision and a new centrality normalization feature, enabling more accurate predictions and comprehensive comparisons with experimental data.

Findings

Good agreement with experimental data for ultracentral flow and transverse momentum.

Predictions for oxygen-oxygen collisions at RHIC and LHC energies.

Insights into Quark-Gluon-Plasma properties from collision analysis.

Abstract

We introduce a global analysis of relativistic heavy ion collisions using Trajectum of a significantly higher precision and including a new option to vary the normalization of the centrality estimator. We use the posterior distribution of our parameters to generate a set of high statistics samples that allows us to make precise predictions including statistical and systematic uncertainties estimated from the model parameter distribution. The results are systematically compared with experiment whereby we also include many observables not included in the global analysis. This includes in particular (extremely) ultracentral anisotropic flow and mean transverse momentum, whereby we find satisfactory agreement with experiment where data is available. Lastly, we compute spectra and anisotropic flow for oxygen-oxygen collisions performed at RHIC and to be performed at the LHC and comment on how these collisions may inform us on properties of the Quark-Gluon-Plasma.