Abstract
We study the fluctuations of net-charge, net-pion, net-kaon and net-proton using $D$-measure and $\nu_{dyn}$ variables in heavy-ion jet interaction generator (HIJING), ultra-relativistic quantum molecular dynamics (UrQMD), and hadron resonance gas (HRG) model at different collision energies \sqsn. It has been observed that, the values of $D$ strongly dependent on $\Delta \eta$ in HIJING and UrQMD models and independent in HRG model. The diffusion coefficients ($\sigma$) of identified particles are estimated at various \sqsn. It is observed that, the $\sigma$ values are independent of collision energies but emphasizes the particle species dependence of diffusion coefficient in the QGP medium. This study provides a realistic baseline for comparison with the experimental data.
Highlights
One of the major goals of heavy-ion experiments is to study the phase transition from hadronic matter to quarkgluon plasma (QGP)
We have calculated the fluctuation strength of identified charged particles, mainly for net pion, net kaon, and net proton using the hadron resonance gas model (HRG), the heavy-ion jet interaction generator (HIJING) model, and the transport model ultrarelativistic quantum molecular dynamics (UrQMD), which will provide the reference for the behavior of fluctuations measured in the experiments
The Nch ν(±,dyn) values estimated from HRG, HIJING, and UrQMD models are shown as a function of η
Summary
One of the major goals of heavy-ion experiments is to study the phase transition from hadronic matter to quarkgluon plasma (QGP). It is argued that the reduction of the fluctuations in the QGP phase might be observed only if the fluctuations are measured over a large rapidity range [10]. The value of ν(±,dyn) gives the measure of the relative correlation strength of (“++,” “−−,” and “+−”) charged particle pairs. The diffusion can further affect the value, but the magnitudes of ν(±,dyn) are mainly determined by the 1/Nch effect and charge conservation. We have calculated the fluctuation strength of identified charged particles, mainly for net pion, net kaon, and net proton using the hadron resonance gas model (HRG), the heavy-ion jet interaction generator (HIJING) model, and the transport model ultrarelativistic quantum molecular dynamics (UrQMD), which will provide the reference for the behavior of fluctuations measured in the experiments.
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