Intermittency analysis of charged particles generated in Xe-Xe~collisions at $\sqrt{s_{\rm{NN}}}$ = 5.44 TeV using the AMPT model

TL;DR

This study analyzes multiplicity fluctuations in Xe-Xe collisions at 5.44 TeV using the AMPT model to explore critical phenomena and phase transition signatures in heavy-ion collisions.

Contribution

It applies the normalized factorial moments and scaling exponents to simulated Xe-Xe collision data, revealing deviations from universal critical behavior.

Findings

Scaling exponent $ u$ exceeds the universal value 1.304.

Dependence of $ u$ on transverse momentum bin width is observed.

Results suggest non-critical behavior in the analyzed collisions.

Abstract

The multiplicity fluctuations are sensitive to QCD phase transition and to the presence of critical point in QCD phase diagram. At critical point a system undergoing phase transition is characterized by large fluctuations in the observables which is an important tool to understand the dynamics of particle production in heavy-ion interactions and phase changes. Multiplicity fluctuations of produced particles is an important observable to characterize the evolving system. Using scaling exponent obtained from the normalized factorial moments of the number of charged hadrons in the two dimensional ($\eta,\phi$) phase space, one can learn about the dynamics of system created in these collisions. Events generated using Xe-Xe collisions at $\sqrt{s_{\rm{NN}}} = 5.44 $ TeV with string-melting (SM) version of the AMPT model are analyzed and the scaling exponent $(\nu)$ for various $p_T$ intervals is determined. It is observed that the calculated value of $\nu$ is larger than the universal value 1.304, as is obtained from Ginzburg-Landau theory for second order phase transition. Here we will also present the results of the dependence of the scaling exponent on the transverse momentum bin width.