STAR experiment results from the beam energy scan program at RHIC

Abstract

We present the first results using the STAR detector from the Beam Energy Scan (BES) program at the Relativistic Heavy-Ion Collider (RHIC). In this program, Au ion collisions at center of mass energies (\sqrt{s_{NN}}) of 7.7, 11.5 and 39 GeV allowed RHIC to extend the study of the QCD phase diagram from baryonic chemical potential values of 20 MeV to about 400 MeV. For the high net-baryon density matter at midrapidity, formed in these collisions, we report several interesting measurements. These include the observation of difference between anti-particle and particle elliptic flow, disappearance of the difference in dynamical azimuthal correlations with respect to event plane between same and opposite signed charged particles, change in slope of eccentricity at freeze-out and directed flow of protons as a function of \sqrt{s_{NN}} and the deviation of higher order fluctuations from hadron resonance gas and Poissonian expectations. Possible interpretations of these observations are also discussed.

To appear in the proceedings for the XXII International Conference on Ultrarelativistic Nucleus-Nucleus Collisions - Quark Matter 2011, Annecy, France, May 23-28, 2011

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• Azimuthal correlations from transverse momentum conservation and possible local parity violation
• Searching for the QCD Critical Point Using Particle Ratio Fluctuations and Higher Moments of Multiplicity Distributions
• Exploring the QCD landscape with high-energy nuclear collisions
• Energy dependence of the freeze out eccentricity from the azimuthal dependence of HBT at STAR

Cited by in corpus (68)

• Freeze-out Conditions in Heavy Ion Collisions from QCD Thermodynamics
• Strongly Correlated Quantum Fluids: Ultracold Quantum Gases, Quantum Chromodynamic Plasmas, and Holographic Duality
• Inclusive charged hadron elliptic flow in Au + Au collisions at $\sqrt{s_{NN}}$ = 7.7 - 39 GeV
• Hadron Formation in Relativistic Nuclear Collisions and the QCD Phase Diagram
• Relation between baryon number fluctuations and experimentally observed proton number fluctuations in relativistic heavy ion collisions
• Revealing baryon number fluctuations from proton number fluctuations in relativistic heavy ion collisions
• Charge-Dependent Correlations in Relativistic Heavy Ion Collisions and the Chiral Magnetic Effect
• Anomalous transport effects and possible environmental symmetry "violation" in heavy ion collisions
• Exploring the partonic phase at finite chemical potential within an extended off-shell transport approach
• Diffusion of conserved charges in relativistic heavy ion collisions
• The chiral phase transition with a chiral chemical potential in the framework of Dyson-Schwinger equations
• Longitudinal dynamics and particle production in relativistic nuclear collisions
• Elliptic flow splitting as a probe of the QCD phase structure at finite baryon chemical potential
• Diffusion processes involving multiple conserved charges: a first study from kinetic theory and implications to the fluid-dynamical modeling of heavy ion collisions
• QCD phase diagram at finite baryon and isospin chemical potentials in Polyakov loop extended quark meson model with vector interaction
• Initial fluctuation effect on harmonic flow in high-energy heavy-ion collisions
• Contributions to the event-by-event charge asymmetry dependence for the elliptic flow of pi^{+} and pi^{-} in heavy-ion collisions
• Progress in vacuum susceptibilities and their applications to the chiral phase transition of QCD
• Open charm and dileptons from relativistic heavy-ion collisions
• Universal aspects of the phase diagram of QCD with heavy quarks
• The Role of Baryon Number Conservation in Measurements of Fluctuations
• Search for the QCD Critical Point by Higher Moments of Net-proton Multiplicity Distributions at STAR
• Electrical conductivity and relaxation via colored noise in a hadronic gas
• Single electrons from heavy-flavor mesons in relativistic heavy-ion collisions
• The chiral magnetic wave in an expanding QCD fluid
• Selected Experimental Results from Heavy Ion Collisions at LHC
• Localized rainbows in the QCD phase diagram
• NNLO HTLpt predictions for the curvature of the QCD phase transition line
• Event-by-event background in estimates of the chiral magnetic effect
• Charge separation with fluctuating domains in relativistic heavy-ion collisions
• Bayesian analysis of (3+1)D relativistic nuclear dynamics with the RHIC beam energy scan data
• Recent Developments in the Study of Deconfinement in Nucleus-Nucleus Collisions
• Local Multiplicity Fluctuations as a Signature of Critical Hadronization at LHC
• Higher moment singularities explored by the net proton non-statistical fluctuations
• Elliptic flow of ϕ-meson a sensitive probe for onset of de-confinement transition in high energy heavy-ion collisions
• Calculating the initial energy density in heavy ion collisions by including the finite nuclear thickness
• Collision energy dependence of elliptic flow splitting between particles and their antiparticles from an extended multiphase transport model
• Elliptic flow of charged pions, protons and strange particles emitted in Pb+Au collisions at top SPS energy
• A faster method of computation of lattice quark number susceptibilities
• Properties of the QGP created in heavy-ion collisions
• Production of Kaon and $\Lambda$ in nucleus-nucleus collisions at ultra-relativistic energy from a blast wave model
• Parity violating quantum kinetic theory in (2+1)-dimensions
• Exact chiral invariance at finite density on the lattice
• Diffusion matrix associated with the diffusion processes of multiple conserved charges in a hot and dense hadronic matter
• The low energy frontier: What is exciting about physics below the top RHIC energy
• Polyakov loop effects on the phase diagram in strong-coupling lattice QCD
• Highlights from BNL-RHIC 2011-2013
• Measurement of beam energy dependent nuclear modification factors at STAR
• Universal scaling of conserved charge in the stochastic diffusion dynamics
• On the effect of secondary protons on baryon and proton number cumulants in event-by-event analysis
• Dependence of asymmetries for charge distribution with respect to the reaction plane on initial energy in heavy ion collisions
• Mean free path of photons in relativistic heavy ion collisions
• A quasiparticle equation of state with a phenomenological critical point
• Scaling of nuclear modification factors for hadrons and light nuclei
• Fate of separate chiral transitions at finite ${\mu }_I$ under the influence of mismatched vector interactions
• A Gaussian Process Generative Model for QCD Equation of State
• Elliptic flow splitting between protons and antiprotons from hadronic potentials
• Hydrodynamic results on multiplicity fluctuations in heavy-ion collisions
• Thermodynamical consistency of quasiparticle model at finite baryon density
• Nucleon clustering at kinetic freezeout of heavy-ion collisions via path-integral Monte Carlo
• A Study of Fluctuations of Voids in Relativistic Ion-Ion Collisions
• Exploring the QCD phase diagram through relativistic heavy ion collisions
• Exploring the partonic phase at finite chemical potential in and out-of equilibrium
• Transport-based initial conditions for heavy-ion collisions at finite densities
• Microscopic identification of dissipative modes in relativistic field theories
• Particle Production at CBM in a Thermal Model Approach
• Exact Chiral Invariance at Finite Density on Lattice
• The effect of charm quark on the QCD chiral phase diagram