ATTENTION: We have to do a short maintenance with downtime on Wed 19 Oct 2022, 9:00 - 10:00 CEST. Please finish your work in time to prevent data loss.
Jul 26 – 30, 2021
Europe/Berlin timezone

Measurements of net-charge fluctuations across various colliding systems with ALICE

Jul 27, 2021, 4:00 PM


Parallel session talk Heavy Ion Physics T05: Heavy Ion Physics


Shaista Khan


Event-by-event fluctuations of conserved quantities such as electric charge, baryon number and strangeness in ultrarelativistic heavy-ion collisions provide insight into the properties of the quark-gluon plasma and the QCD phase diagram. The net-charge fluctuations in finite phase space are usually studied using the $\nu_{dyn}$ observable, which is robust against the detection efficiency losses and with a proper multiplicity scaling it becomes equivalent to the strongly intensive quantity $\Sigma$. In this talk, the values of $\nu_{dyn}$ are explored with ALICE detector in various colliding systems, namely, pp and p-Pb at $\sqrt{s_{\rm NN}} = 5.02$ TeV, Pb-Pb at $\sqrt{s_{\rm NN}} = 2.76$ and 5.02 TeV, and Xe-Xe at $\sqrt{s_{\rm NN}} = 5.44$ TeV. The observed dependence of $\nu_{dyn}$ on charged-particle density shows a regular smooth evolution of net-charge fluctuations from smaller to larger collision systems. Furthermore, the observed negative values of $\nu_{dyn}$ indicate the dominance of correlation between the oppositely charged particle pairs as compared to those arising from the like-sign charge pairs. These findings are compared to the predictions of HIJING, EPOS and PYTHIA models. Effect of the kinematical acceptance has also been investigated by examining the $\nu_{dyn}$ dependence on the width of the pseudorapidity window within the ALICE acceptance $|\eta|<0.8$ and in different transverse momentum ranges, whereas the effect of the hadronic resonance decays is studied by comparing the experimental findings with the prediction of HIJING model.

First author ALICE CC chairs
Collaboration / Activity ALICE

Primary authors

Presentation materials