Degrees of Freedom of the Quark Gluon Plasma, Tested by Heavy Mesons

Berrehrah, H.; Nahrgang, Marlene; Song, Taesoo; Ozvenchuck, V.; Gossiaux, Pol Bernard; Werner, K.; Bratkovskaya, Elena; Aichelin, J.

doi:10.1007/978-3-319-44165-8_12

Cited by 4 publications

(2 citation statements)

References 80 publications

(97 reference statements)

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“…We note that the scattering cross sections of heavy quark used in the PHSD calculations are twice larger than from the Born diagrams of the DQPM in order to achieve consistency with the lQCD data from Refs. [30,59], however, they differ substantially from the pQCD scenario [60].…”

Section: Heavy-quark Interactions In the Qgpmentioning

confidence: 80%

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: Heavy-quark Interactions In the Qgpmentioning

confidence: 80%

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

et al. 2017

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“…If a light or heavy quark has a momentum of at most of the order of the temperature with respect to the medium rest frame, its movement can be characterized by a "transport coefficient", known as the diffusion coefficient D [60,61]. The value of D may depend modestly on the quark mass but, within the validity of the diffusive description, is independent of the momentum (cf., e.g., ref.…”

Section: Heavy-and Light-flavor Diffusionmentioning

confidence: 99%

Heavy-flavor production and medium properties in high-energy nuclear collisions --What next?

et al. 2017

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Abstract. Open and hidden heavy-flavor physics in high-energy nuclear collisions are entering a new and exciting stage towards reaching a clearer understanding of the new experimental results with the possibility to link them directly to the advancement in lattice Quantum Chromo-Dynamics (QCD). Recent results from experiments and theoretical developments regarding open and hidden heavy-flavor dynamics have been debated at the Lorentz Workshop Tomography of the Quark-Gluon Plasma with Heavy Quarks, which was held in October 2016 in Leiden, The Netherlands. In this contribution, we summarize identified common understandings and developed strategies for the upcoming five years, which aim at achieving a profound knowledge of the dynamical properties of the quark-gluon plasma.

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Jet transport coefficients by elastic and radiative scatterings in the strongly interacting quark-gluon plasma

Grishmanovskii,

Soloveva,

Song

et al. 2024

Phys. Rev. C

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We extend the investigation of jet transport coefficients within the effective dynamical quasiparticle model (DQPM)—constructed to describe nonperturbative QCD phenomena of the strongly interacting quark-gluon plasma (sQGP) in line with the lattice QCD equation of state—by accounting for inelastic 2→3 reactions with gluon radiation in addition to the elastic scattering of partons. The elastic and inelastic reactions are calculated explicitly within leading-order Feynman diagrams with effective propagators and vertices from the DQPM by accounting for all channels and their interferences. We present the results for the jet transport coefficients such as the transverse momentum transfer squared q̂ per unit length as well as the energy loss dE/dx per unit length in the sQGP and investigate their dependence on the temperature T and momentum of the jet parton depending on the choice of the strong coupling constant αs in thermal, jet parton, and radiative vertices. For the latter, we consider different scenarios used in the literature and find a very strong dependence of q̂ and dE/dx on the choice of αs. Moreover, we explore the relation of q̂/T3 to the ratio of specific shear viscosity to entropy density η/s and show that the ratio T3/q̂ to η/s has a strong T dependence—especially when approaching Tc—on the choice of αs in scattering vertices. Published by the American Physical Society 2024

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Degrees of Freedom of the Quark Gluon Plasma, Tested by Heavy Mesons

Cited by 4 publications

References 80 publications

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

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

Heavy-flavor production and medium properties in high-energy nuclear collisions --What next?

Jet transport coefficients by elastic and radiative scatterings in the strongly interacting quark-gluon plasma

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