Centrality dependence of strangeness production in heavy-ion collisions as a geometrical effect of core-corona superposition

Abstract

It is shown that data on strange particle production as a function of centrality in Au-Au collisions at \sqrt(s)_{NN}= 200 GeV can be explained with a superposition of emission from a hadron gas at full chemical equilibrium (core) and from nucleon-nucleon collisions at the boundary (corona) of the overlapping region of the two colliding nuclei. This model nicely accounts for the enhancement of phi meson and strange particle production as a function of centrality observed in relativistic heavy ion collisions at that energy. The enhancement is mainly a geometrical effect, that is the increasing weight of the core with respect to corona for higher centrality, while strangeness canonical suppression in the core seems to play a role only in very peripheral collisions. This model, if confirmed at lower energy, would settle the long-standing problem of strangeness under-saturation in relativistic heavy ion collisions, parametrized by $\gs$. Furthermore, it would give a unique tool to locate the onset of deconfinement in nuclear collisions both as a function of energy and centrality if this is to be associated to the onset of the formation of a fully equilibrated core.

arXiv comment8 pages, 5 figures

References in corpus (26)

• Glauber Modeling in High Energy Nuclear Collisions
• Hadron production in Au-Au collisions at RHIC
• Energy and system size dependence of chemical freeze-out in relativistic nuclear collisions
• Identified particle distributions in pp and Au+Au collisions at sqrt{s_NN}=200 GeV
• Measurements of Strange Particle Production in $p+p$ Collisions at $\sqrt{s}$= 200 GeV
• Thermal hadron production in pp and p{\bar p} collisions
• Chemical equilibrium study in nucleus-nucleus collisions at relativistic energies
• Core-Corona Separation in Ultra-Relativistic Heavy Ion Collisions
• Statistical hadronization of heavy quarks in ultra-relativistic nucleus-nucleus collisions
• Canonical Description of Strangeness Enhancement from p-A to Pb-Pb Collisions
• Measurements of $\varphi$ meson production in relativistic heavy-ion collisions at RHIC
• Statistical hadronisation model and transverse momentum spectra of hadrons in high energy collisions
• Enhanced strange baryon production in Au+Au collisions compared to p+p at sqrts = 200 GeV
• Enhancement of hyperon production at central rapidity in 158 A GeV/c Pb-Pb collisions
• Centrality Dependence of Thermal Parameters Deduced from Hadron Multiplicities in Au + Au Collisions at sqrt{s_{NN}} = 130 GeV
• Scaling of Charged Particle Production in d+Au Collisions at sqrt(s_NN) = 200 GeV
• Chemical freeze-out in ultra-relativistic heavy ion collisions at sqrt(s)_NN = 130 and 200 GeV
• Energy and system size dependence of ϕmeson production in Cu+Cu and Au+Au collisions
• Strangeness production from SPS to LHC
• Chemical Equilibrium in Collisions of Small Systems
• Description of the particle ratios and transverse-momentum spectra for various centralities at RHIC in a single-freeze-out model
• Canonical Strangeness Enhancement
• System-size dependence of strangeness production in high-energy A+A collisions and percolation of strings
• Jet absorption and corona effect at RHIC. Extracting collision geometry from experimental data
• Interplay of the emission from thermal and direct sources in relativistic heavy ion collisions
• Strangeness Saturation: Energy- and System-Size Dependence

Cited by in corpus (46)

• Event-by-Event Simulation of the Three-Dimensional Hydrodynamic Evolution from Flux Tube Initial Conditions in Ultrarelativistic Heavy Ion Collisions
• Multi-strange baryon production at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Analysing radial flow features in p-Pb and p-p collisions at several TeV by studying identified particle production in EPOS3
• Bulk and shear viscosities of matter created in relativistic heavy-ion collisions
• Correlations from hydrodynamic flow in p-Pb collisions
• Lambda Polarization in Peripheral Heavy Ion Collisions
• Flow and interferometry in 3+1 dimensional viscous hydrodynamics
• GLISSANDO 2: GLauber Initial-State Simulation AND mOre..., ver. 2
• A comparative analysis of statistical hadron production
• Transverse-momentum fluctuations in relativistic heavy-ion collisions from event-by-event viscous hydrodynamics
• Centrality dependence of hadronization and chemical freeze-out conditions in heavy ion collisions at \sqrt s_{NN} = 2.76 TeV
• Unified description of hadron yield ratios from dynamical core-corona initialization
• Hadronization and Hadronic Freeze-Out in Relativistic Nuclear Collisions
• Core-corona procedure and microcanonical hadronization to understand strangeness enhancement in proton-proton and heavy ion collisions in the EPOS4 framework
• Rapid hydrodynamic expansion in relativistic heavy-ion collisions
• Strange hadron production in heavy ion collisions from SPS to RHIC
• System-size dependence of Lambda and Xi production in nucleus--nucleus collisions at 40A and 158A GeV measured at the CERN Super Proton Synchrotron
• Transverse-momentum spectra of strange particles produced in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV in the chemical non-equilibrium model
• Probe the QCD phase diagram with ϕ-mesons in high energy nuclear collisions
• Strangeness fluctuations and MEMO production at FAIR
• An introduction to the Statistical Hadronization Model
• GLISSANDO 3: GLauber Initial-State Simulation AND mOre..., ver. 3
• Strangeness enhancements at central rapidity in 40 A GeV/c Pb-Pb collisions
• System-size and centrality dependence of charged kaon and pion production in nucleus-nucleus collisions at 40A GeV and158A GeV beam energy
• Core-corona separation in the UrQMD hybrid model
• Shear viscosity and chemical equilibration of the QGP
• Longitudinal fluctuations of the center of mass of the participants in heavy-ion collisions
• Causality Constraints on Hadron Production In High Energy Collisions
• Strangeness production via resonances in heavy-ion collisions at SIS energies
• Mini-jet quenching in a concurrent jet+hydro evolution and the non-equilibrium quark-gluon plasma
• Centrality and system size dependence of (multi-strange) hyperons at 40$A$ and 158$A$ GeV: A comparison between a binary collision and a Boltzmann + hydrodynamic hybrid model
• Rapidity scaling of multiplicity and flow in weakly and strongly interacting systems
• Enhancement of strange baryons in high-multiplicity proton-proton and proton-nucleus collisions
• Interplay of the emission from thermal and direct sources in relativistic heavy ion collisions
• Core-corona interplay in Pb-Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV
• Geometrical scaling for energies available at the BNL Relativistic Heavy Ion Collider to those at the CERN Large Hadron Collider
• Centrality dependence of chemical freeze-out parameters and strangeness equilibration in RHIC and LHC energies
• Modeling Strangeness Enhancements to resolve the Muon Excess in Cosmic Ray Extensive Air Shower Data
• Particle Production at the SPS and the QCD Phase Diagram
• Strangeness production in d+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV in STAR
• Charmonium Production and Corona Effect
• Recent results on strangeness production from NA49
• Strangeness Enhancement in p+p, p+Pb and Pb+Pb Collisions at LHC Energies
• Considerations on the suppression of charged particles and ${\pi }^0$ in high energy heavy ion collisions
• Investigating the QCD phase diagram with hadron multiplicities at NICA
• System Size Dependence of Particle Production at the SPS