Scaling behaviour of charged particles generated in Xe$-$Xe collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.44 TeV using the AMPT model

Abstract

The spatial configurations of particles produced in the kinematic phase space during a heavy-ion collision reflect the characteristics of the system created in the collision. The scaling behaviour of the multiplicity fluctuations is studied for the charged particles generated in Xe--Xe collisions at $\sqrt{s_{\mathrm{NN}}}$~=~5.44~TeV using the String Melting (SM) mode of the AMPT (A Multi-Phase Transport) model. The scaling behaviour of the normalized factorial moments ($F_{\text{q}}$) gives significant information about the dynamics of the system under study. A linear power-law growth of the $F_{\text{q}}$ with the increasing phase space resolution, termed as intermittency, is investigated. The anomalous fractal dimension $D_{\text{q}}$ is determined, which is linked to the self-similarity and fractal nature of the particle emission spectra, whose dependence on the order of the moment ($q$) is characterised by the intermittency index (${\phi }_{\text{q}}$). Relating $q^{\mathrm{th}}$ order Normalised Factorial Moment (NFM) with $F_2$, the scaling exponent ($\nu$) is determined that quantifies the dynamics of the system created by these collisions and is analyzed for its dependence on the transverse momentum bin width ($\Delta p_{\text{T}}$). Results presented may be interpreted as model predictions and baseline expectations.

Comments: 10 figures