Energy Dependence of Pion and Kaon Production in Central Pb+Pb Collisions

Abstract

Measurements of charged pion and kaon production in central Pb+Pb collisions at 40, 80 and 158 AGeV are presented. These are compared with data at lower and higher energies as well as with results from p+p interactions. The mean pion multiplicity per wounded nucleon increases approximately linearly with s_NN^1/4 with a change of slope starting in the region 15-40 AGeV. The change from pion suppression with respect to p+p interactions, as observed at low collision energies, to pion enhancement at high energies occurs at about 40 AGeV. A non-monotonic energy dependence of the ratio of K^+ to pi^+ yields is observed, with a maximum close to 40 AGeV and an indication of a nearly constant value at higher energies.The measured dependences may be related to an increase of the entropy production and a decrease of the strangeness to entropy ratio in central Pb+Pb collisions in the low SPS energy range, which is consistent with the hypothesis that a transient state of deconfined matter is created above these energies. Other interpretations of the data are also discussed.

revised version to appear in Phys. Rev. C, 33 pages including 11 figures

References in corpus (1)

• Energy dependence of kaon production in central Pb+Pb collisions

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• Statistical Fluctuations and Correlations in Hadronic Equilibrium Systems
• Strangeness chemical potential from the baryons relative to the kaons particle ratios
• Study on chemical equilibrium in nucleus-nucleus collisions at relativistic energies
• Generalized binomial transform applied to the divergent series
• A Comprehensive Study of Energy Dependence of Particle Ratios in $pp$ Collisions from SPS to LHC Energies
• Chemical equilibrium study at SPS 158A GeV
• Study of hard and electromagnetic processes at CERN-SPS energies: an investigation of the high-${\mu }_{\mathbf{B}}$ region of the QCD phase diagram with NA60+
• HBT radii : Comparative studies on collision systems and beam energies
• Multiplicity of charged particles in Pb-Pb collisions at SPS energies
• Evolution of the concept of Quark Matter: the Ianus face of the heavy ion collisions
• Energy dependence of $\varphi$(1020) meson production in nucleus-nucleus collisions at the CERN SPS
• Hybrid model with viscous relativistic hydrodynamics: a role of constraints on the shear-stress tensor
• Geant4 FTF model description of the latest data by the NA61/SHINE collaboration on ${}^{40}\mathrm{Ar}+{}^{45}\mathrm{Sc}$ interactions
• The role of the chiral phase transition in modelling the kaon to pion ratio
• The QGP phase in relativistic heavy-ion collisions
• A possible evidence of observation of two mixed phases in nuclear collisions
• Kaon production from 1 to 40 A GeV
• Radiative parton energy loss and baryon stopping in $AA$ collisions
• Imprints of a critical point on photon emission
• Estimating $\eta /s$ of QCD matter at high baryon densities
• Particle Production at CBM in a Thermal Model Approach
• Recent Results from PHOBOS at RHIC
• Formation of antideuterons in heavy ion collisions
• An appropriate statistical approach for nonequilibrium particle production
• Universal Behavior of Charged Particle Production in Heavy Ion Collisions at RHIC Energies
• Phase-Space Description of Momentum Spectra in Relativistic Heavy-Ion Collisions
• Pion production in p+p interactions and Be+Be collisions at the CERN SPS energies
• The quest for the quark-gluon plasma from the perspective of dynamical models of relativistic heavy-ion collisions
• A deep learning approach for predicting multiple observables in Au+Au collisions at RHIC
• Statistical Hadronization of Multistrange Particles
• Non-Extensive Transverse Momentum Distribution For Identified Particles at $\sqrt{S_{NN}}=$ 7.7, 11.5, 19.6, 27, 39 \hspace{0.05cm} GeV
• A global description of heavy-ion collisions
• Effect of various particlization scenarios on anisotropic flow and particle production using UrQMD hybrid model
• Centrality dependence of some characteristics of relativistic nuclear interactions and percolation cluster formation
• Correlations in STAR: interferometry and event structure
• Spectra and elliptic flow of light hadrons in an expanding fire-cylinder model for the RHIC Beam Energy Scan
• System Size Dependence of Particle Production at the SPS
• Multistrange Hyperon Production in Pb+Pb collisions at 30, 40, 80 and 158 A$\cdot$GeV
• Identified charged hadron production in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 54.4 GeV with the STAR detector
• Microscopic study of baryon stopping in low-energy heavy-ion collisions within UrQMD model
• Rapidity spectra in high-energy collisions and longitudinal nuclear suppression from nonadditive statistics
• A new bound on supersymmetric Q-balls
• First Results from Photon Multiplicity Detector at RHIC
• Heavy-ion physics at the CERN SPS H2: NA35, NA49 and NA61/SHINE (with personal recollections)
• The domain of soft hadrons in transverse momentum space in high energy collisions