Net-charge particle ratio fluctuations in $pp$ collisions at several LHC energies

Abstract

Event-by-event particle ratio fluctuations for simulated data sets of three different models named UrQMD, AMPT, and Pythia are studied using the fluctuation variable $ν_{dyn}$. The simulated data sets produced in $pp$ collisions at four different LHC energies $\sqrt{s} = 2.76, 5.02, 7$ and $13$ TeV are generated and considered for this analysis. The variation of fluctuation parameter $ν_{dyn}$ for accepted pair of meson and baryon combination $i.e.$ $[π, K]$, $[π, p]$ and $[p, K]$ with the increasing value of the mean multiplicity of charged particles ($\langle N_{ch} \rangle$) are investigated. It has been observed that the correlation between the particle pair $[π, K]$ is more than that of the two other particle pairs $[π, p]$ and $[p, K]$. However, the energy-wise inspection of the fluctuation variable $ν_{dyn}$ for $0-10\%$ centrality data shows the increase in the correlation between the particles in each pair for all three models considered.