Quark Matter 2023

Event-by-event local multiplicity fluctuations in charged particle production at the LHC energies with ALICE

5 Sept 2023, 17:30

2h 10m

Grand Ballroom, 4th floor ( Hilton of the Americas)

Poster Collective Dynamics Poster Session

Speaker

Ramni Gupta (University of Jammu (IN))

Description

A hot and dense system formed in heavy-ion collisions can be characterized by studying the scaling behavior of the spatial distributions of the produced particles. In this contribution, we present intermittency analysis of the normalized factorial moments ($F{}_{\mathrm{q}}$) of the multiplicity distributions of the charged particles produced in Pb--Pb collisions as a function of phase-space resolution. The spatial configurations of the charged particles in two-dimensional ($\eta ,\phi$) phase space are investigated. For a system with scale-invariant dynamical fluctuations due to the characteristic critical behavior near the phase transition, the $F{}_{\mathrm{q}}$ exhibits power-law growth with increasing phase-space resolution, which is a signature of self-similar fluctuations and the fractal structure of the system. The dependence of the fractal dimension $D_q$ on the order parameter $q$ is indicative of the multifractal nature of the system. By relating the $q^{\mathrm{t}\mathrm{h}}$-order $F{}_{\mathrm{q}}$ to the normalized second-order factorial moment ($F{}_2$), we extract the scaling exponent ($\nu$), which provides information about the order of the phase transition in the framework of the Ginzburg-Landau theory. The first results of the intermittency analysis show the presence of scale-invariant fluctuations, the multifractal nature of the system, and that $\nu$ is independent of $p{}_{\mathrm{T}}$ in the soft $p{}_{\mathrm{T}}$ region. The measurements are also compared with the corresponding results from the AMPT and HIJING models.

Presentation materials

ALICE_Intermittency@JU_Poster.pdf