Eur. Phys. J. A (2016) 52: 324
https://doi.org/10.1140/epja/i2016-16324-6

Regular Article - Theoretical Physics

Particle production and chemical freezeout from the hybrid UrQMD approach at NICA energies

¹ Egyptian Center for Theoretical Physics (ECTP), Modern University for Technology and Information (MTI), 11571, Cairo, Egypt
² World Laboratory for Cosmology and Particle Physics (WLCAPP), Cairo, Egypt
³ Physics Department, Faculty of Science, Benha University, 13518, Benha, Egypt
⁴ Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980, Dubna, Moscow region, Russia
⁵ Veksler and Baldin Laboratory of High Energy Physics, Joint Institute for Nuclear Research, 141980, Dubna, Moscow region, Russia
⁶ National Research Nuclear University (MEPhI), 115409, Moscow, Russia
⁷ Dubna International University, 141980, Dubna, Russia

^* e-mail: a.tawfik@eng.mti.edu.eg

Received: 8 March 2016
Accepted: 8 September 2016
Published online: 26 October 2016

Abstract

The energy dependence of various particle ratios is calculated within the Ultra-relativistic Quantum Molecular Dynamics approach and compared with the hadron resonance gas (HRG) model and measurements from various experiments, including RHIC-BES, SPS and AGS. It is found that the UrQMD particle ratios agree well with the experimental results at the RHIC-BES energies. Thus, we have utilized UrQMD in simulating particle ratios at other beam energies down to 3GeV, which will be accessed at NICA and FAIR future facilities. We observe that the particle ratios for crossover and first-order phase transition, implemented in the hybrid UrQMD v3.4, are nearly indistinguishable, especially at low energies (at large baryon chemical potentials or high density).