Strange hadron production in Au+Au collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}$ = 7.7, 11.5, 19.6, 27, and 39 GeV

Abstract

We present STAR measurements of strange hadron (${\mathrm{K}}_{\mathrm{S}}^0$, $\Lambda$, $\overline{\Lambda }$, ${\Xi }^{-}$, ${\overline{\Xi }}^{+}$, ${\Omega }^{-}$, ${\overline{\Omega }}^{+}$, and $\varphi$) production at mid-rapidity ($|y|<0.5$) in Au+Au collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}$ = 7.7 - 39 GeV from the Beam Energy Scan Program at the Relativistic Heavy Ion Collider (RHIC). Transverse momentum spectra, averaged transverse mass, and the overall integrated yields of these strange hadrons are presented versus the centrality and collision energy. Antibaryon-to-baryon ratios ($\overline{\Lambda }$/$\Lambda$, ${\overline{\Xi }}^{+}$/${\Xi }^{-}$, ${\overline{\Omega }}^{+}$/${\Omega }^{-}$) are presented as well, and used to test a thermal statistical model and to extract the temperature normalized strangeness and baryon chemical potentials at hadronic freeze-out (${\mu }_B/T_{\mathrm{ch}}$ and ${\mu }_S/T_{\mathrm{ch}}$) in central collisions. Strange baryon-to-pion ratios are compared to various model predictions in central collisions for all energies. The nuclear modification factors ($R_{\text{CP}}$) and antibaryon-to-meson ratios as a function of transverse momentum are presented for all collision energies. The ${\mathrm{K}}_{\mathrm{S}}^0$ $R_{\text{CP}}$ shows no suppression for $p_{\mathrm{T}}$ up to 3.5 $\mathrm{GeV}/c$ at energies of 7.7 and 11.5 GeV. The $\overline{\Lambda }$/${\mathrm{K}}_{\mathrm{S}}^0$ ratio also shows baryon-to-meson enhancement at intermediate $p_{\mathrm{T}}$ ($\approx$2.5 $\mathrm{GeV}/c$) in central collisions at energies above 19.6 GeV. Both observations suggest that there is likely a change of the underlying strange quark dynamics at collision energies below 19.6 GeV.

arXiv comment26 pages, 29 figures, version accepted by Physical Review C

References in corpus (72)

• Microscopic Models for Ultrarelativistic Heavy Ion Collisions
• Relativistic Hadron-Hadron Collisions in the Ultra-Relativistic Quantum Molecular Dynamics Model (UrQMD)
• Glauber Modeling in High Energy Nuclear Collisions
• Thermal phenomenology of hadrons from 200 AGeV S+S collisions
• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Hadron production in central nucleus-nucleus collisions at chemical freeze-out
• Transverse momentum and collision energy dependence of high $p_T$ hadron suppression in Au+Au collisions at ultrarelativistic energies
• Hadronization in heavy ion collisions: Recombination and fragmentation of partons
• The STAR Time Projection Chamber: A Unique Tool for Studying High Multiplicity Events at RHIC
• Parton coalescence and antiproton/pion anomaly at RHIC
• Bulk Properties of the Medium Produced in Relativistic Heavy-Ion Collisions from the Beam Energy Scan Program
• Hadron production in heavy ion collisions: Fragmentation and recombination from a dense parton phase
• Energy Dependence of Pion and Kaon Production in Central Pb+Pb Collisions
• Elliptic flow at large transverse momenta from quark coalescence
• Particle-type dependence of azimuthal anisotropy and nuclear modification of particle production in Au+Au collisions at s(NN)**(1/2) = 200-GeV
• Parton coalescence at RHIC
• Energy Dependence of Moments of Net-proton Multiplicity Distributions at RHIC
• Identified particle distributions in pp and Au+Au collisions at sqrt{s_NN}=200 GeV
• Energy and system size dependence of chemical freeze-out in relativistic nuclear collisions
• Pion and kaon production in central Pb+Pb collisions at 20A and 30A GeV: Evidence for the onset of deconfinement
• Features of particle multiplicities and strangeness production in central heavy ion collisions between 1.7A and 158A GeV/c
• K${}_{\mathrm{S}}^0$ and $\mathrm{\Lambda }$ production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Beam energy dependence of moments of the net-charge multiplicity distributions in Au+Au collisions at RHIC
• Identified baryon and meson distributions at large transverse momenta from Au+Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Multi-strange baryon production at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Centrality dependence of pi^[+/-], K^[+/-], p and p-bar production from sqrt(s_NN)=130 GeV Au + Au collisions at RHIC
• Production of charged pions, kaons and protons at large transverse momenta in pp and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Beam-Energy Dependence of Directed Flow of Protons, Antiprotons and Pions in Au+Au Collisions
• Centrality, rapidity and transverse momentum dependence of $J/\psi$ suppression in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$=2.76 TeV
• Additional Strange Hadrons from QCD Thermodynamics and Strangeness Freeze-out in Heavy Ion Collisions
• Partonic flow and $\varphi$-meson production in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Phi meson production in Au+Au and p+p collisions at sqrt (s)=200 GeV
• Maximum Relative Strangeness Content in Heavy Ion Collisions Around 30 A.GeV
• Energy dependence of charged pion, proton and anti-proton transverse momentum spectra for Au+Au collisions at \sqrt{s_NN} = 62.4 and 200 GeV
• Multi-Strange Baryon Production in Au-Au collisions at sqrt(s_NN) = 130 GeV
• Mid-rapidity $\Lambda$ and $\bar{\Lambda }$ Production in Au+Au Collisions at $\sqrt{s_{{}_{NN}}}=130$ GeV
• Elliptic flow of identified hadrons in Au+Au collisions at $\sqrt{s_{NN}}=$ 7.7--62.4 GeV
• Strangeness dynamics and transverse pressure in relativistic nucleus-nucleus collisions
• Single Identified Hadron Spectra from sqrt(s_NN)=130 GeV Au+Au Collisions
• Antinuclei in Heavy-Ion Collisions
• Measurements of $\varphi$ meson production in relativistic heavy-ion collisions at RHIC
• Energy dependence of Lambda and Xi production in central Pb+Pb collisions at 20A, 30A, 40A, 80A, and 158A GeV measured at the CERN Super Proton Synchrotron
• Collision Energy Dependence of Moments of Net-Kaon Multiplicity Distributions at RHIC
• Strangeness Enhancement in Cu+Cu and Au+Au Collisions at \sqrt{s_{NN}} = 200 GeV
• Enhanced strange baryon production in Au+Au collisions compared to p+p at sqrts = 200 GeV
• Measurement of the lambda and lambda^bar particles in Au+Au Collisions at sqrt(s_NN)=130 GeV
• Strange and Multi-strange Particle Production in Au+Au Collisions at $\sqrt{s_{NN}}$ = 62.4 GeV
• Enhancement of hyperon production at central rapidity in 158 A GeV/c Pb-Pb collisions
• Optimal conditions for exploring high-density baryonic matter
• Extensive Particle Identification with TPC and TOF at the STAR Experiment
• Observation of an energy-dependent difference in elliptic flow between particles and anti-particles in relativistic heavy ion collisions
• Inclusive Distributions for Hadronic Collisions in the Valon-Recombination Model
• QCD Phase Diagram: Phase Transition, Critical Point and Fluctuations
• The TOFp/pVPD Time of Flight System for STAR
• $\Lambda$ and $\bar{\Lambda }$ Production in Central Pb-Pb Collisions at 40, 80, and 158 A$\cdot$GeV
• Energy and system size dependence of ϕmeson production in Cu+Cu and Au+Au collisions
• Centrality Dependence of Kaon Yields in Si+A and Au+Au Collisions at Relativistic Energies
• Omega and Antiomega production in central Pb+Pb collisions at 40 and 158 AGeV
• Energy dependence of hyperon production in nucleus-nucleus collisions at SPS
• Kaon Production and Kaon to Pion Ratio in Au+Au Collisions at $\snn=130$ GeV
• Strangeness enhancement and Energy dependence in Heavy Ion Collisions
• Probing Parton Dynamics of QCD Matter with $\Omega$ and $\varphi$ Production
• Beam Energy Dependence of Jet-Quenching Effects in Au+Au Collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}$ = 7.7, 11.5, 14.5, 19.6, 27, 39, and 62.4 GeV
• Near-threshold production of the multi-strange ${\Xi }^{-}$ hyperon
• Production of strange particles at intermediate pT at RHIC
• Antilambda production in Au+Au collisions at 11.7 A GeV/c
• System-size dependence of Lambda and Xi production in nucleus--nucleus collisions at 40A and 158A GeV measured at the CERN Super Proton Synchrotron
• Parton Distributions at Hadronization from Bulk Dense Matter Produced at RHIC
• On the chemical equilibration of strangeness-exchange reaction in heavy-ion collisions
• Centrality Dependence of Baryon and Meson Momentum Distributions in Proton-Nucleus Collisions
• Nuclear Matter Expansion Parameters from the Measurement of Differential Multiplicities for Lambda Production in Central Au+Au Collisions at AGS
• Strange Particle Production and Elliptic Flow from CERES

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