Intermittency study of charged particles generated in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}\text{= 2.76 TeV}$ using EPOS3

TL;DR

This study investigates charged particle fluctuations in Pb-Pb collisions at 2.76 TeV using EPOS3, finding no significant intermittency scaling but evidence of multifractal behavior in particle production.

Contribution

It provides the first intermittency analysis of charged particles in Pb-Pb collisions at LHC energies using EPOS3, highlighting multifractality and comparing with phase transition predictions.

Findings

No significant power-law scaling observed in factorial moments.

Scaling exponent exceeds the value predicted for a second order phase transition.

Particle production exhibits multifractal characteristics.

Abstract

Charged particle multiplicity fluctuations in Pb-Pb collisions are studied for the central events generated using EPOS3 (hydro and hydro+cascade) at $\sqrt{s_{\mathrm{NN}}}\text{ = 2.76 TeV}$. Intermittency analysis is performed in the mid-rapidity region in two-dimensional ($\eta$, $\phi$) phase space within the narrow transverse momentum ($p_\rm{{T}}$) bins in the low $p_\rm{{T}}$~region ($p_\rm{{T}}~\leq~1.0~GeV/\textit{c}$). Power-law scaling of the normalized factorial moments with the number of bins is not observed to be significant in any of the $p_\rm{{T}}$-bin. Scaling exponent $\nu$, deduced for a few $p_\rm{{T}}$ bins is greater than that of the value 1.304, predicted for the second order phase-transition by the Ginzburg-Landau theory. The link in the notions of fractality is also studied. Fractal dimensions, $D_{q}$ are observed to decrease with the order of the moment $q$ suggesting the multifractal nature of the particle generation in EPOS3.