Particle Ratios within EPOS, UrQMD and Thermal Models at AGS, SPS and RHIC Energies

Abstract

The particle ratios $k^{+}/{\pi }^{+}$, ${\pi }^{-}/K^{-}$, $\bar{p}/{\pi }^{-}$, $\Lambda /{\pi }^{-}$, $\Omega /{\pi }^{-}$, $p/{\pi }^{+}$, ${\pi }^{-}/{\pi }^{+}$, $K^{-}/K^{+}$, $\bar{p}/p$, $\bar{\Lambda }/\Lambda$, $\bar{\Sigma }/\Sigma$, $\bar{\Omega }/\Omega$ measured at AGS, SPS and RHIC energies are compared with large statistical ensembles of $100,000$ events deduced from the CRMC EPOS $1.99$ and the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) hybrid model. In the UrQMD hybrid model two types of phase transitions are taken into account. All these are then confronted to the Hadron Resonance Gas Model. The two types of phase transitions are apparently indistinguishable. Apart from $k^{+}/{\pi }^{+}$, $k^{-}/{\pi }^{-}$, $\Omega /{\pi }^{-}$, $\bar{p}/{\pi }^{+}$, and $\bar{\Omega }/\Omega$, the UrQMD hybrid model agrees well with the CRMC EPOS $1.99$. Also, we conclude that the CRMC EPOS $1.99$ seems to largely underestimate $k^{+}/{\pi }^{+}$, $k^{-}/{\pi }^{-}$, $\Omega /{\pi }^{-}$, and $\bar{p}/{\pi }^{+}$.

8 pages, 2 figures, submitted to JETP

References in corpus (6)

• Chiral crossover in QCD at zero and non-zero chemical potentials
• Mapping the Phases of Quantum Chromodynamics with Beam Energy Scan
• Fully integrated transport approach to heavy ion reactions with an intermediate hydrodynamic stage
• Equilibrium Statistical-Thermal Models in High-Energy Physics
• Status of QGSJET
• Equation of State for Cosmological Matter at and beyond QCD and Electroweak Eras