Monte-Carlo models predictions for centrality dependence of mesons in Au–Au and Cu–Cu collisions at RHIC energies

Alamgir Khan; Yasir Ali; Taimoor Khurshid; Uzma Tabassam; Ali Zaman

doi:10.1140/epjp/s13360-024-05877-7

2023 Impact factor 2.8

EPJ PLUS - Condensed Matter and Complex Systems

Eur. Phys. J. Plus (2024) 139: 1077
https://doi.org/10.1140/epjp/s13360-024-05877-7

Regular Article

Monte-Carlo models predictions for centrality dependence of $K^{} {(892)}^{0}$ $K^{}(892)^{0}$ mesons in Au–Au and Cu–Cu collisions at RHIC energies

Alamgir Khan¹^a, Yasir Ali², Taimoor Khurshid¹, Uzma Tabassam² and Ali Zaman²

¹ Department of Physics, Faculty of Sciences, International Islamic University(IIU), H-10, 44000, Islamabad, Pakistan
² Department of Physics, COMSATS University Islamabad Campus, Park Road, 45550, Islamabad, Pakistan

^a alamgir054@yahoo.com

Received: 10 October 2024
Accepted: 23 November 2024
Published online: 9 December 2024

Abstract

In the present paper, we have reported the production of $K^{*} {(892)}^{0}$ $K^{*}(892)^{0}$ mesons in different centrality classes within the transverse momentum range of $0 < p_{T} < 5 GeV / c$ $0< p_{ T} < 5 \;\text {GeV}/\text {c}$ for Au–Au and $0 < p_{T} < 3.5 GeV / c$ $0< p_{ T} < 3.5 \;\text {GeV}/\text {c}$ for Cu–Cu collision. This analysis considers the mid-rapidity region of $| y | < 0.5$ $$|y| < 0.5$$ and the collision energies of 62.4 and $200 GeV$ $200 \; \text {GeV}$ . We have also calculated the nuclear modification factor $R_{CP}$ $R_{\text {CP}}$ (central to peripheral) for $K^{*} {(892)}^{0}$ $K^{*}(892)^{0}$ , $K_{s}^{0} (310)$ $K^{0}_{s}(310)$ mesons and $Λ$ $\Lambda$ baryon at different energies. For the production of $K^{*} {(892)}^{0}$ $K^{*}(892)^{0}$ mesons, we have used PYTHIA 8.3 Monte-Carlo simulation code including the color reconnection modes, CR mode 1 and CR mode 2 of PYTHIA. We have compared the resulting simulated data with experimental data from Solenoid tracker at RHIC experiment. In comparison with the PYTHIA8 and CR1 mode yields, PYTHIA CR2 mode gives good estimate of STAR data for $K^{*} {(892)}^{0}$ $K^{*}(892)^{0}$ mesons production across various centrality classes. There is a good estimate between PYTHIA CR2 and STAR data for high centrality classes while default PYTHIA8 predictions deviate more from STAR data as the centrality increases. The behavior of the nuclear modification factor, $R_{CP}$ $R_{\text {CP}}$ , for the $K^{*} {(892)}^{0}$ $K^{*}(892)^{0}$ meson at both $62.4 GeV$ $62.4 \; \text {GeV}$ and $200 GeV$ $200 \; \text {GeV}$ is well explained by the CR2 mode. The default PYTHIA8 predictions for $K_{s}^{0} (310)$ $K^{0}_{s}(310)$ meson for $R_{CP}$ $R_{\text {CP}}$ are fairly in close agreement to the STAR data. The ratio of strange to non-strange particles ( $K^{*} {(892)}^{0}$ $K^{*}(892)^{0}$ / $π^{+}$ $\pi ^{+}$ ) is also predicted by PYTHIA model for Cu–Cu and Au–Au collisions at RHIC energies. Furthermore, an assessment for the relative abundance of considered mesons is also performed across Cu–Cu and Au–Au collisions.

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Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

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