Modeling net-charge fluctuations in heavy-ion collisions at the LHC

TL;DR

This paper investigates net-charge fluctuations in heavy-ion collisions at the LHC using the HYDJET++ model, focusing on volume fluctuation effects and charge conservation to better match experimental data from ALICE and CMS.

Contribution

It introduces a modified HYDJET++ model with explicit net-charge conservation, improving agreement with experimental results.

Findings

Canonical charge conservation enhances model-data agreement.

Strongly intensive quantities effectively remove volume fluctuation effects.

HYDJET++ with charge conservation matches LHC data better than previous models.

Abstract

The analysis of Pb+Pb data for net-charge fluctuations at LHC energies within the HYDJET++ model is presented. The strongly intensive quantities $D$ and $\Sigma$ are used to get rid of the effects related to volume fluctuations of the system. We employ two versions of the HYDJET++ for the analysis. The first one is the standard or default version, whereas the second one represents its further modification, which takes into account explicit event-by-event conservation of the electric net-charge of produced particles. Inclusion of the canonical net-charge conservation in the model allows one for better description of the experimental data obtained by the ALICE and the CMS Collaborations. Comparison with calculations of other models is also presented.