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 ${\nu }_{dyn}$. 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 ${\nu }_{dyn}$ for accepted pair of meson and baryon combination $i.e.$ $[\pi ,K]$, $[\pi ,p]$ and $[p,K]$ with the increasing value of the mean multiplicity of charged particles ($⟨N_{ch}⟩$) are investigated. It has been observed that the correlation between the particle pair $[\pi ,K]$ is more than that of the two other particle pairs $[\pi ,p]$ and $[p,K]$. However, the energy-wise inspection of the fluctuation variable ${\nu }_{dyn}$ for $0-10\%$ centrality data shows the increase in the correlation between the particles in each pair for all three models considered.

Comments: 16 pages, 18 figures, Submitted to Journal for peer-review