Recent results on spectra and yields from NA49

Abstract

The energy dependence of hadron production in central Pb+Pb collisions is presented and discussed. In particular, midrapidity $m_T$-spectra for ${\pi }^{-}$, $K^{-}$, $K^{+}$, $p$, $\bar{p}$, $d$, $\varphi$, $\Lambda$ and $\bar{\Lambda }$ at 40, 80 and 158 $A$GeV are shown. In addition $\Xi$ and $\Omega$ spectra are available at 158 $A$GeV. The spectra allow to determine the thermal freeze-out temperature $T$ and the transverse flow velocity ${\beta }_T$ at the three energies. We do not observe a significant energy dependence of these parameters; furthermore there is no indication of early thermal freeze-out of $\Xi$ and $\Omega$ at 158 $A$GeV. Rapidity spectra for ${\pi }^{-}$, $K^{-}$, $K^{+}$ and $\varphi$ at 40, 80 and 158 $A$GeV are shown, as well as first results on $\Omega$ rapidity distributions at 158 $A$GeV. The chemical freeze-out parameters $T$ and ${\mu }_B$ at the three energies are determined from the total yields. The parameters are close to the expected phase boundary in the SPS energy range and above. Using the total yields of kaons and lambdas, the energy dependence of the strangeness to pion ratio is discussed. A maximum in this ratio is found at 40 $A$GeV. This maximum could indicate the formation of deconfined matter at energies above 40 $A$GeV. A search for open charm in a large sample of 158 $A$GeV events is presented. No signal is observed. This result is compared to several model predictions.

10 pages, 9 figures, Presented at Quark Matter 2002, Nantes, France

References in corpus (12)

• Microscopic Models for Ultrarelativistic Heavy Ion Collisions
• Lattice determination of the critical point of QCD at finite T and μ
• Energy Dependence of Pion and Kaon Production in Central Pb+Pb Collisions
• Evidence of early multi-strange hadron freeze-out in high energy nuclear collisions
• Maximum Relative Strangeness Content in Heavy Ion Collisions Around 30 A.GeV
• Hydrodynamical assessment of 200 AGeV collisions
• Cascade and anti-cascade production in central Pb+Pb collisions at 158 GeV/c per nucleon
• Direct Emission of multiple strange baryons in ultrarelativistic heavy-ion collisions from the phase boundary
• The production of charm mesons from quark matter at CERN SPS and RHIC
• Systematic Study of the Kaon to Pion Multiplicity Ratios in Heavy-Ion Collisions
• Nucleus-nucleus collisions at high baryon densities
• Probing Hadronization with Strangeness

Cited by in corpus (49)

• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Energy and system size dependence of chemical freeze-out in relativistic nuclear collisions
• Chemical equilibrium study in nucleus-nucleus collisions at relativistic energies
• Systematic Studies of the Centrality and sqrt(s_NN) Dependence of dE_T/deta and dN_ch/deta in Heavy Ion Collisions at Mid-rapidity
• Strangeness dynamics and transverse pressure in relativistic nucleus-nucleus collisions
• Single Identified Hadron Spectra from sqrt(s_NN)=130 GeV Au+Au Collisions
• Relativistic Heavy-Ion Collisions within 3-Fluid Hydrodynamics: Hadronic Scenario
• Transverse energy production and charged-particle multiplicity at midrapidity in various systems from $\sqrt{s_{NN}}=7.7$ to 200 GeV
• Hadron Production and Phase Changes in Relativistic Heavy Ion Collisions
• Measurement of the pseudorapidity and centrality dependence of the transverse energy density in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Omega and Antiomega production in central Pb+Pb collisions at 40 and 158 AGeV
• Transverse Activity of Kaons and the Deconfinement Phase Transition in Nucleus--Nucleus Collisions
• Centrality dependence of identified particle elliptic flow in relativistic heavy ion collisions at sqrt(s)= 7.7--62.4 GeV
• Equilibrium Statistical-Thermal Models in High-Energy Physics
• Velocity of sound in relativistic heavy-ion collisions
• The Freezeout Hypersurface at LHC from particle spectra: Flavor and Centrality Dependence
• Strange anti-particle to particle ratios at mid-rapidity in sqrt(s_NN)= 130 GeV Au+Au Collisions
• Review of Results from the NA49 Collaboration
• Indication of a Co-Existing Phase of Quarks and Hadrons in Nucleus - Nucleus Collisions
• Kaon and Pion Production in Central Au+Au Collisions at \sqrt{s_{NN}}=62.4 GeV
• Study of the transverse mass spectra of strange particles in Pb-Pb collisions at 158 A GeV/c
• Inhomogeneous freeze-out in relativistic heavy-ion collisions
• Transverse Energy per Charged Particle and Freeze-Out Criteria in Heavy-Ion Collisions
• Baryon-antibaryon production asymmetry in relativistic heavy ion collisions
• Unintegrated CCFM parton distributions and pion production in proton-proton collisions at high energies
• Charged Particle and Photon Multiplicity, and Transverse Energy Production in High-Energy Heavy-Ion Collisions
• A comparison of statistical hadronization models
• Strange Baryon Production From Nucleus-Nucleus Collisions at the AGS, SPS and RHIC
• $K^{\ast }(892{)}^0$ meson production in inelastic $p+p$ interactions at 40 and 80 GeV/$c$ beam momenta measured by NA61/SHINE at the CERN SPS
• Transverse-Mass Spectra in Heavy-Ion Collisions at energies E_{lab} = 2--160 GeV/nucleon
• Centrality and pseudorapidity dependence of the transverse energy density in pPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• System size dependence of strange particle yields and spectra at sqrt(s)=17.3 GeV
• Possible glueball production in relativistic heavy-ion collisions
• Deconfinement energy threshold: analysis of hadron yields at 11.6 A GeV
• Centrality and $\sqrt{s_{NN}}Dependenceofthe$dE_{T}/dη$and$dN_{ch}/dη$ in Heavy Ion Collisions at Mid-Rapidity
• Production of light antinuclei in heavy ion collisions
• NA57 main results
• Role of system size on freezeout conditions extracted from transverse momentum spectra of hadrons
• Fluctuations in the Statistical Model of Relativistic Heavy Ion Collisions
• Hydrodynamic emission of strange and non-strange particles at RHIC and LHC
• Strangeness chemical potential from the baryons relative to the kaons particle ratios
• Possible production of exotic baryonia in relativistic heavy-ion collisions
• Transverse Energy Measurements from the Beam Energy Scan in PHENIX
• Constraints on shear stress tensor in viscous relativistic hydrodynamics
• Hybrid model with viscous relativistic hydrodynamics: a role of constraints on the shear-stress tensor
• Evolution of the concept of Quark Matter: the Ianus face of the heavy ion collisions
• Formation of antideuterons in heavy ion collisions
• Statistical hadronization phenomenology in heavy ion collisions at SPS and RHIC energies
• Multistrange Hyperon Production in Pb+Pb collisions at 30, 40, 80 and 158 A$\cdot$GeV