Abstract
The dynamical net-charge fluctuations (νdyn) in different particle ratiosK/π,K/p, andp/πare calculated from the hadron resonance gas (HRG) model and compared with STAR central Au+Au collisions atsNN=7.7–200 GeV and NA49 central Pb+Pb collisions atsNN=6.3–17.3 GeV. The three charged particle ratios (K/π,K/p, andp/π) are determined as total and average of opposite and average of the same charges. We find an excellent agreement between the HRG calculations and the experimental measurements, especially from STAR beam energy scan (BES) program, while the strange particles in the NA49 experiment at lower Super Proton Synchrotron (SPS) energies are not reproduced by the HRG approach. We conclude that the utilized HRG version seems to take into consideration various types of correlations including strong interactions through the heavy resonances and their decays especially at BES energies.
Highlights
The heavy-ion experiments are designed to study the nuclear matter under extreme conditions of high temperature or density or both of them [1]
The hadron resonance gas (HRG) calculations are compared with STAR [25] and NA49 [34] measurements
We have observed that the dynamical net-charge fluctuations possess a remarkable dependence on the beam energy, from which we follow the change in their values and might be able to signal the impact of quark-gluon plasma (QGP) formation
Summary
The heavy-ion experiments are designed to study the nuclear matter under extreme conditions of high temperature or density or both of them [1]. The dynamical charge fluctuations in QGP era are remarkably reduced from the ones characterizing the early stages of the heavy-ion collision which can be described by quarks and gluons degrees of freedom [20]. This illustrates the importance of considering the propagation of fluctuations from the very early stages of the collisions to the state of chemical freezeout via hadronization and other processes before drawing any conclusions about these fluctuations as a reflection of the QGP formation. We present HRG calculations for the energy dependence of the dynamical net-charge fluctuations ]dyn in different particle ratios: K/π, p/π, and K/p.
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