Identified hadron production from the RHIC beam energy scan

Kumar, L.

doi:10.1088/0954-3899/38/12/124145

Cited by 65 publications

(82 citation statements)

References 28 publications

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“…These quantities can be extracted from the measured hadron yields. Transverse momentum spectra for the BES Phase-I energies are obtained for π, K, p, Λ, Ξ, K 0 S , and φ [6]. The particle ratios are used to obtain the chemical freeze-out (a state when the yields of particles get fixed) conditions using the statistical thermal model (THERMUS) [7].…”

Section: Accessing Qcd Phase Diagrammentioning

confidence: 99%

STAR Results from the RHIC Beam Energy Scan-I

Kumar

2013

Nuclear Physics A

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The Beam Energy Scan (BES) program is being pursued at RHIC to study the QCD phase diagram, and search for the possible QCD phase boundary and possible QCD critical point. The data for Phase-I of the BES program have been collected for Au+Au collisions at center-of-mass energies ( √ s NN ) of 7.7, 11.5, 19.6, 27, and 39 GeV. These collision energies allowed the STAR experiment to cover a wide range of baryon chemical potential µ B (100-400 MeV) in the QCD phase diagram. We report on several interesting results from the BES Phase-I covering the high net-baryon density region. These results shed light on particle production mechanism and freezeout conditions, first-order phase transition and "turn-off" of QGP signatures, and existence of a critical point in the phase diagram. Finally, we give an outlook for the future BES Phase-II program and a possible fixed target program at STAR.

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Section: Accessing Qcd Phase Diagrammentioning

confidence: 99%

STAR Results from the RHIC Beam Energy Scan-I

Kumar

2013

Nuclear Physics A

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“…This phase transition is expected to turn into a first or- * Electronic address: song@fias.uni-frankfurt.de der transition at a critical point (T r , µ r ) in the phase diagram with increasing baryon chemical potential µ B . Since this critical point cannot be determined theoretically in a reliable way the beam energy scan (BES) program performed at the RHIC by the STAR collaboration aims to find the critical point and the phase boundary by gradually decreasing the collision energy [4,5].…”

Section: Introductionmentioning

confidence: 99%

Single electrons from heavy-flavor mesons in relativistic heavy-ion collisions

et al. 2017

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We study the single electron spectra from D− and B−meson semileptonic decays in Au+Au collisions at √ sNN =200, 62.4, and 19.2 GeV by employing the parton-hadron-string dynamics (PHSD) transport approach that has been shown to reasonably describe the charm dynamics at RelativisticHeavy-Ion-Collider (RHIC) and Large-Hadron-Collider (LHC) energies on a microscopic level. In this approach the initial charm and bottom quarks are produced by using the PYTHIA event generator which is tuned to reproduce the fixed-order next-to-leading logarithm (FONLL) calculations for charm and bottom production. The produced charm and bottom quarks interact with off-shell (massive) partons in the quark-gluon plasma with scattering cross sections which are calculated in the dynamical quasi-particle model (DQPM) that is matched to reproduce the equation of state of the partonic system above the deconfinement temperature Tc. At energy densities close to the critical energy density (≈ 0.5 GeV/fm 3 ) the charm and bottom quarks are hadronized into D− and B−mesons through either coalescence or fragmentation. After hadronization the D− and B−mesons interact with the light hadrons by employing the scattering cross sections from an effective Lagrangian. The final D− and B−mesons then produce single electrons through semileptonic decay. We find that the PHSD approach well describes the nuclear modification factor RAA and elliptic flow v2 of single electrons in d+Au and Au+Au collisions at √ sNN = 200 GeV and the elliptic flow in Au+Au reactions at √ sNN = 62.4 GeV from the PHENIX collaboration, however, the large RAA at √ sNN = 62.4 GeV is not described at all. Furthermore, we make predictions for the RAA of D−mesons and of single electrons at the lower energy of √ sNN = 19.2 GeV. Additionally, the medium modification of the azimuthal angle φ between a heavy quark and a heavy antiquark is studied. We find that the transverse flow enhances the azimuthal angular distributions close to φ = 0 because the heavy flavors strongly interact with nuclear medium in relativistic heavy-ion collisions and almost flow with the bulk matter.

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“…Here we will discuss the identified particle production produced in Au+Au collisions at BES center-of-mass energies √ s NN = 7.7, 11.5, 19.6, 27, and 39 GeV [25,26]. The energy and centrality dependence of particle yields, ratios of particle yields, and average transverse mass will also be discussed for the above energies.…”

Section: Introductionmentioning

confidence: 99%

Identified particle production and freeze-out properties in heavy-ion collisions at RHIC Beam Energy Scan program

Das

2015

EPJ Web of Conferences

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Abstract. The first phase of Beam Energy Scan (BES) program at the Relativistic Heavy-Ion Collider (RHIC) was started in the year 2010 with the aim to study the several aspects of the quantum chromodynamics (QCD) phase diagram. The Solenoidal Tracker At RHIC (STAR) detector has taken data at √ s NN = 7.7, 11.5, 19.6,27, and 39 GeV in Au+Au collisions in the years 2010 and 2011 as part of the BES programme. For these beam energies, we present the results on the particle yields, average transverse mass and particle ratios for identified particles in mid-rapidity (|y| < 0.1). The measured particle ratios have been used to study the chemical freezeout dynamics within the framework of a statistical model.

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Identified hadron production from the RHIC beam energy scan

Cited by 65 publications

References 28 publications

STAR Results from the RHIC Beam Energy Scan-I

STAR Results from the RHIC Beam Energy Scan-I

Single electrons from heavy-flavor mesons in relativistic heavy-ion collisions

Identified particle production and freeze-out properties in heavy-ion collisions at RHIC Beam Energy Scan program

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