Исследование фактора ядерной модификации инклюзивных заряженных частиц в столкновениях Au+Au в диапазоне энергий программы BES-II STAR на основе моделей UrQMD и SMASH+vHLLE

A.Zh. Aitbayev; A.A. Aparin; A.A. Korobitsin; Ye.S. Mukhamedzhanov

doi:10.63907/ansa.v2i2.90

Authors

A.Zh. Aitbayev Joint Institute for Nuclear Research, Dubna, Russia; Al-Farabi Kazakh National University, Almaty, Kazakhstan; Institute of Nuclear Physics, Almaty, Kazakhstan
A.A. Aparin Joint Institute for Nuclear Research, Dubna, Russia
A.A. Korobitsin Joint Institute for Nuclear Research, Dubna, Russia
Ye.S. Mukhamedzhanov Joint Institute for Nuclear Research, Dubna, Russia; Institute of Nuclear Physics, Almaty, Kazakhstan

DOI:

https://doi.org/10.63907/ansa.v2i2.90

Keywords:

relativistic heavy-ion collisions, quark-gluon plasma, QCD phase diagram, Beam Energy Scan, $R_{CP}$

Abstract

The Beam Energy Scan (BES) program at the RHIC collider is designed to perform a detailed study of the QCD phase diagram, including the search for the phase transition boundary of the first-order phase transition from hadronic matter to QGP, the determination of the QCD critical point location, and the investigation of other aspects of the phase behavior of nuclear matter. A previously observed feature in QGP studies is the suppression of high-transverse-momentum particle yields, $p_T>2$~GeV/$c$, at $\sqrt{s_{NN}}=62.4-200$~GeV. This effect was established through measurements of the nuclear modification factors $R_{AA}$ and $R_{CP}$ for charged particles in the BES-I program of the STAR experiment (Phys. Rev. Lett. \textbf{121}, 032301 (2018)). This work presents a comparison of the nuclear modification factor $R_{CP}$ for inclusive charged particles in Au+Au collisions at $\sqrt{s_{NN}} = 7.7-27$ GeV, obtained from Monte Carlo simulations using the UrQMD transport model and the SMASH+vHLLE hybrid model, with the published experimental data from the STAR BES-I program. The ability of the models under consideration to reproduce the experimental observations over a wide range of energies and transverse momenta is analyzed, and possible sources of the observed discrepancies are discussed.

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