Exploring Strangeness Enhancement and Particle Production in Small Collision Systems with EPOS4 at $\sqrt{s_\rm{NN}}$ = 5.02 TeV

Abstract

The observation of collectivity and strangeness enhancement in small collision systems, such as proton-proton (pp) and proton-lead (p-Pb) collisions, challenges traditional assumptions regarding thermalization and particle production mechanisms. In this study, we investigate particle yields and transverse momentum distributions in pp and p-Pb collisions at $\sqrt{s_\rm{NN}}$ = 5.02 TeV using the EPOS4 event generator, which employs a core-corona framework to model particle production across a variety of system sizes. EPOS4 successfully reproduces many qualitative trends observed in experimental data, including the hardening of $p_{\mathrm{T}}$-spectra with multiplicity, the hierarchical strangeness enhancement in strange-to-pion ratios, and characteristic modifications of particle yield ratios as a function of $p_{\mathrm{T}}$ and multiplicity. The microcanonical approach to core hadronization used in EPOS4 seems to provide a more realistic description of small systems compared to grand-canonical treatments. Nonetheless, quantitative discrepancies still persist in describing several physical observables. Future model refinements, including improved core-corona balancing, differential freeze-out conditions for multi-strange hadrons, and incorporation of finite strangeness correlation volumes, may be taken into account for enhancing EPOS4's predictive power and deepening our understanding of the complex dynamics governing the particle production in high-energy collisions.

22 pages, 24 figures, accepted for publication in PRD

References in corpus (37)

• A Brief Introduction to PYTHIA 8.1
• EPOS LHC : test of collective hadronization with LHC data
• Thermal phenomenology of hadrons from 200 AGeV S+S collisions
• Enhanced production of multi-strange hadrons in high-multiplicity proton-proton collisions
• Multiplicity Dependence of Pion, Kaon, Proton and Lambda Production in p-Pb Collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Evidence for collectivity in pp collisions at the LHC
• Parton-Based Gribov-Regge Theory
• Physics of Strongly coupled Quark-Gluon Plasma
• String Formation Beyond Leading Colour
• Event-by-Event Simulation of the Three-Dimensional Hydrodynamic Evolution from Flux Tube Initial Conditions in Ultrarelativistic Heavy Ion Collisions
• Small System Collectivity in Relativistic Hadron and Nuclear Collisions
• Production of charged pions, kaons and (anti-)protons in Pb-Pb and inelastic pp collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Centrality dependence of particle production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$= 5.02 TeV
• Core-Corona Separation in Ultra-Relativistic Heavy Ion Collisions
• Transverse momentum distribution and nuclear modification factor of charged particles in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Analysing radial flow features in p-Pb and p-p collisions at several TeV by studying identified particle production in EPOS3
• Transverse momentum spectra and nuclear modification factors of charged particles in pp, p-Pb and Pb-Pb collisions at the LHC
• A 3+1 dimensional viscous hydrodynamic code for relativistic heavy ion collisions
• Pseudorapidity density of charged particles in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Multiplicity dependence of light-flavor hadron production in pp collisions at $\sqrt{s}$ = 7 TeV
• Multiplicity dependence of charged pion, kaon, and (anti)proton production at large transverse momentum in p-Pb collisions at $\sqrt{{\text{s}}_{\mathrm{NN}}}$ = 5.02 TeV
• Enhanced strange baryon production in Au+Au collisions compared to p+p at sqrts = 200 GeV
• Production of K${}^{\ast }$(892)${}^0$ and $\varphi$(1020) in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Hadron freeze-out conditions in high energy nuclear collisions
• Multiplicity dependence of (multi-)strange hadron production in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Multiplicity dependence of $\pi$, K, and p production in pp collisions at $\sqrt{s}=13$ TeV
• Two-pion femtoscopy in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Statistical Model Predictions for Particle Ratios at sqrt(s_NN) = 5.5 TeV
• Core-corona procedure and microcanonical hadronization to understand strangeness enhancement in proton-proton and heavy ion collisions in the EPOS4 framework
• Particle production in p-p collisions and prediction for LHC energy
• Baryon production from cluster hadronization
• Chemical Equilibrium in Collisions of Small Systems
• Canonical aspects of strangeness enhancement
• Core-corona separation in the UrQMD hybrid model
• Collective flow in high-multiplicity proton-proton collisions
• Emergence of long-range angular correlations in low-multiplicity proton-proton collisions
• Canonical Statistical Model and hadron production in $e^{+}{e}^{-}$ annihilations