Self-similarity of negative particle production from the Beam Energy Scan Program at STAR

TL;DR

This study analyzes negative particle production in gold-gold collisions across a wide energy range, revealing self-similarity and exploring energy loss and scaling properties in high-energy nuclear collisions.

Contribution

It provides the first comprehensive spectra over a broad energy range and demonstrates self-similarity in negative particle production, along with analysis of energy loss using z-scaling.

Findings

Strong energy dependence of spectra, increasing with pT

Evidence of self-similarity in particle production

Estimated constituent energy loss and studied model parameters

Abstract

We present the spectra of negative charged particle production in Au+Au collisions from STAR for the first phase of the RHIC Beam Energy Scan Program measured over a wide range of collision energy sqrt s{NN}=7.7-200 GeV, and transverse momentum of produced particle in different centralities at |eta|<0.5. The spectra demonstrate strong dependence on collision energy which enhances with pT. An indication of self-similarity of negative charged particle production in Au+Au collisions is found. The constituent energy loss as a function of energy and centrality of collisions and transverse momentum of inclusive particle was estimated in the $z$-scaling approach. The energy dependence of the model parameters - the fractal and fragmentation dimensions and "specific heat", was studied.