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Particle spectra in the integrated hydrokinetic model at RHIC Beam-Energy-Scan energies

Narendra Rathod1,2, Yuri Sinyukov3,1, Musfer Adzhymambetov3,*, and Hanna Zbroszczyk1

  • *Contact author: adzhymambetov@gmail.com
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Phys. Rev. C 113, 024911 – Published 17 February, 2026

DOI: https://doi.org/10.1103/dfxf-jxvf

Abstract

We study light-hadron production in Au+Au collisions at sNN=7.7–39GeV using an extended Integrated HydroKinetic Model (iHKMe). Focusing on transverse momentum spectra, we investigate the sensitivity to key model parameters, particularly the thermalization timescale. We consider two distinct equations of state: one featuring a crossover and the other a first-order phase transition. In both cases, thermalization begins shortly before full nuclear overlap and lasts approximately 1fm/c across all energies. Both equations of state provide a similarly good description of the soft particle momentum spectra once the other parameters are slightly adjusted. The most pronounced differences arise at the lower RHIC BES energy of sNN=7.7GeV, particularly in proton and kaon yields, reflecting their sensitivity to the freezeout parameters.

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Phys. Rev. C 113, 024911– Published 17 February, 2026
  • Received 3 October 2025
  • Accepted 15 January 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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