Speaker
Description
Investigations involving event-by-event fluctuations of conserved quantities, such as net charge, net baryon number, and strangeness, provide important insights into the properties of the quark-gluon plasma and the phase diagram of strongly interacting matter. An attempt is, therefore made to study fluctuations of net electric charge in pp collisions at $\sqrt{s} = 13$ and 13.6 TeV, and in OO, Ne-Ne, and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 5.36$ TeV, using data collected by the ALICE detector at the CERN Large Hadron Collider. The dependence of $\nu_{\mathrm{dyn}}[+,-]$ on charged-particle density shows a smooth, energy-independent increase of net-charge fluctuations from smaller to larger collision systems. The negative values of $\nu_{\mathrm{dyn}}[+,-]$ observed in all collision systems indicate a dominance of correlations between oppositely charged particle pairs. Since $\nu_{\mathrm{dyn}}[+,-]$ has an intrinsic dependence on multiplicity, scaling is applied as with proper scaling the variable is envisaged to be equivalent to the strongly intensive observable $\Sigma$.
A systematic study of the acceptance dependence of $\nu_{\mathrm{dyn}}[+,-]$ is carried out by varying the width of the pseudorapidity window, placed symmetrically about the centre of the $\eta$ distribution. Furthermore, the D-measure is investigated. The results are compared with model calculations from PYTHIA, EPOS4, AMPT, HIJING, and PYTHIA Angantyr.
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