Dynamical fluctuations of charged hadron multiplicity ratios and transverse momentum correlation at the STAR-BES (phase I) energies using transport models

Abstract We study the event-by-event dynamical fluctuation of charged hadron multiplicity ratios in 197 Au+ 197 Au interaction at energies used in phase I of the STAR beam energy scan program. We use the ultra-relativistic quantum molecular dynamics (UrQMD) and the a multiphase transport (AMPT) model to generate minimum-bias samples of 197 Au+ 197 Au collision events. We also study the transverse momentum correlation of charged hadrons in the framework of these two models. Wherever possible, our simulated results are compared with those obtained from the STAR experiment. We do not observe any non-monotonic behavior in the centrality and energy dependence of either the dynamical fluctuation or the two-particle transverse momentum correlation of charged hadrons. As the transport models used in our analysis do not incorporate the dynamics associated with any critical phenomenon, they are going to serve only as a baseline prediction of the experimental results.