Charm elliptic flow in relativistic heavy-ion collisions

Zhang, Bin; Chen, Lie‐Wen; Ko, C. M.

doi:10.1103/physrevc.72.024906

Cited by 114 publications

(99 citation statements)

References 65 publications

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“…Although it had been expected that the R AA of heavy flavor is less suppressed and its elliptic flow is smaller as compared to the corresponding quantities for light hadrons, the experimental data show that the suppression of heavy-flavor hadrons at high transverse momentum and its elliptic flow v 2 are comparable to those of light hadrons [6,7]. This is a puzzle for heavy-flavor production and dynamics in relativistic heavy-ion collisions as pointed out by many groups [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. For recent reviews we refer the reader to Refs.…”

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…By using parton scattering cross sections of 6−10 mb, the AMPT model with string melting was able to reproduce both the centrality and transverse momentum (below 2 GeV/c) dependence of the elliptic flow [10] and pion interferometry [22] measured in Au + Au collisions at √ s = 130A GeV at RHIC [37,38]. It has also been used for studying the kaon interferometry [39] and charm flow [40] in these collisions. We note that these parton cross sections are significantly smaller than that needed to reproduce the parton elliptic flow from the hydrodynamic model [41].…”

Section: The Ampt Modelmentioning

confidence: 99%

Anisotropic flow inCu+Aucollisions atsNN=200GeV

Chen

2006

Phys. Rev. C

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The anisotropic flow of charged hadrons in asymmetric Cu + Au collisions at the Relativistic Heavy Ion Collider is studied in a multiphase transport model. Compared with previous results for symmetric Au + Au collisions, charged hadrons produced around midrapidity in asymmetric collisions are found to have a stronger directed flow v 1 and their elliptic flow v 2 is also more sensitive to the parton scattering cross section. Although higher order flows v 3 and v 4 are small at all rapidities, both v 1 and v 2 in these collisions are appreciable and show an asymmetry in forward and backward rapidities.

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“…To explain the observed small value of R e AA or large suppression of heavy meson production in relativistic heavy ion collisions, other mechanisms for energy loss of heavy quarks in quark-gluon plasma have been proposed [5][6][7][8][9][10]. Also, it was suggested that the enhancement of charmed baryon production over charmed meson production, i.e., the c /D 0 ratio, would suppress the R e AA of the electrons from heavy mesons [11,12].…”

Section: Introductionmentioning

confidence: 99%

Ratios of heavy baryons to heavy mesons in relativistic nucleus-nucleus collisions

et al. 2009

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Heavy baryon/meson ratios c /D 0 and b /B 0 in relativistic heavy ion collisions are studied in the quark coalescence model. For heavy baryons, we include production from coalescence of heavy quarks with free light quarks as well as with bounded light diquarks that might exist in the strongly coupled quark-gluon plasma produced in these collisions. Including the contribution from decays of heavy hadron resonances and also that due to fragmentation of heavy quarks that are left in the system after coalescence, the resulting c /D 0 and b /B 0 ratios in midrapidity (|y| 0.5) from central Au + Au collisions at √ s NN = 200 GeV are about a factor of five and ten, respectively, larger than those given by the thermal model, and about a factor of ten and twelve, respectively, larger than corresponding ratios in the PYTHIA model for pp collisions. These ratios are reduced by a factor of about 1.6 if there are no diquarks in the quark-gluon plasma. The transverse momentum dependence of the heavy baryon/meson ratios is found to be sensitive to the heavy quark mass, with the b /B 0 ratio being much flatter than the c /D 0 ratio. The latter peaks at the transverse momentum p T

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Charm elliptic flow in relativistic heavy-ion collisions

Cited by 114 publications

References 65 publications

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

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

Anisotropic flow inCu+Aucollisions atsNN=200GeV

Ratios of heavy baryons to heavy mesons in relativistic nucleus-nucleus collisions

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