Study of dynamical charge fluctuations in the hadronic medium

TL;DR

This study investigates how dynamical charge fluctuations evolve in ultra-relativistic heavy-ion collisions using hadronic models, identifying optimal observation windows and comparing simulation results with experimental data from RHIC and LHC.

Contribution

It provides a systematic analysis of charge fluctuation evolution and optimal observation parameters in heavy-ion collisions using UrQMD and HIJING models, with comparison to experimental data.

Findings

Optimal pseudorapidity window for fluctuations is between 2.0 and 3.5.

Model calculations agree with experimental data at various collision energies.

Final state effects influence the magnitude of charge fluctuations.

Abstract

The dynamical charge fluctuations have been studied in ultra-relativistic heavy-ion collisions by using hadronic model simulations, such as UrQMD and HIJING. The evolution of fluctuations has been calculated at different time steps during the collision as well as different observation window in pseudorapidity (\DelEta). The final state effects on the fluctuations have been investigated by varying $\bigtriangleup\eta$~ and the time steps with the aim of obtaining an optimum observation window for capturing maximum fluctuations. It is found that $\bigtriangleup\eta$~ between 2.0 and 3.5 gives the best coverage for the fluctuations studies. The results of these model calculations for Au+Au collisions at $\sqrt{s_{\rm NN}}$~=~7.7 to 200~GeV and for Pb+Pb collisions at 2.76 TeV are presented and compared with available experimental data from the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC).