Predictions for Identified Hadron ($\pi^\pm$, $K^\pm$ and $p(\overline{p})$) Production and Collective Dynamics in Oxygen-Oxygen Collisions at $\sqrt{s_{NN}}$= 7 TeV with EPOS4, AMPT-SM, and Angantyr in Pythia 8

TL;DR

This paper compares predictions of hadron production and collective flow in oxygen-oxygen collisions at 7 TeV using EPOS4, AMPT-SM, and Pythia 8 models, highlighting differences in flow effects and preparing for upcoming experimental data.

Contribution

It provides detailed predictions for hadron yields, spectra, and flow observables in O+O collisions using multiple models, emphasizing the role of hydrodynamic flow implementation.

Findings

EPOS4's hydrodynamic flow significantly enhances collective behavior predictions.

AMPT-SM incorporates some flow effects, but less than EPOS4.

Pythia 8 shows weaker flow effects compared to other models.

Abstract

We study the dynamics of identified hadrons ($\pi^\pm$, $K^\pm$ and $p(\overline{p})$) production in $O+O$ collisions at $\sqrt{s_{\mathrm{NN}}} = 7$TeV using recently updated version of EPOS4, string melting version of A Multi-Phase Transport Model (AMPT-SM) and Angantyr model, incorporated within Pythia 8. We examine the interplay between different mechanisms implemented in these models. Predictions for charged particle multiplicity ($dN_{ch}/d\eta$), transverse momentum ($p_T$) spectra of identified hadrons, particle yield ($dN/dy$) and mean transverse mass ($\langle m_T \rangle$) are presented. To probe the collective behavior of the produced particles, the $p_T$-differential kaons-to-pion and proton-to-pion ratios are studied. While AMPT incorporates some flow effects, EPOS4's implementation of full hydrodynamic flow proves significantly more effective. In contrast, the flow effects in Pythia 8 are substantially weaker compared to the other models. The upcoming $O+O$ data from the LHC will help constrain the parameters of these models.