Impact of the initial size of spatial fluctuations on the collective flow in Pb–Pb collisions at $\sqrt{{{s}_{{\rm NN}}}}$ = 2.76 TeV

Konchakovski, V. P.; Cassing, W.; Тонеев, В.Д.

doi:10.1088/0954-3899/42/5/055106

Cited by 30 publications

(29 citation statements)

References 80 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the past, the PHSD transport model, based on temperature-dependent DQPM masses, widths, and cross sections [58], has successfully described numerous experimental data in relativistic heavy-ion collisions from the Alternating Gradient Synchrotron (AGS), Super-Proton Synchrotron (SPS), RHIC, and Large Hadron Collider (LHC) energies [56,57,[59][60][61][62][63][64].…”

Section: Introductionmentioning

confidence: 99%

Exploring the partonic phase at finite chemical potential within an extended off-shell transport approach

et al. 2019

View full text Add to dashboard Cite

We extend the parton-hadron-string dynamics (PHSD) transport approach in the partonic sector by explicitly calculating the total and differential partonic scattering cross sections as a function of temperature T and baryon chemical potential µB on the basis of the effective propagators and couplings from the dynamical quasiparticle model (DQPM) that is matched to reproduce the equation of state of the partonic system above the deconfinement temperature Tc from lattice QCD. We calculate the collisional widths for the partonic degrees of freedom at finite T and µB in the timelike sector and conclude that the quasiparticle limit holds sufficiently well. Furthermore, the ratio of shear viscosity η over entropy density s, i.e., η/s, is evaluated using the collisional widths and compared to lattice QCD calculations for µB = 0 as well. We find that the novel ratio η/s does not differ very much from that calculated within the original DQPM on the basis of the Kubo formalism. Furthermore, there is only a very modest change of η/s with the baryon chemical µB as a function of the scaled temperature T /Tc(µB). This also holds for a variety of hadronic observables from central A + A collisions in the energy range 5 GeV ≤ √ sNN ≤ 200 GeV when implementing the differential cross sections into the PHSD approach. We only observe small differences in the antibaryon sector (p,Λ +Σ 0 ) at √ sNN = 17.3 GeV and 200 GeV with practically no sensitivity of rapidity and pT distributions to the µB dependence of the partonic cross sections. Small variations in the strangeness sector are obtained in all collisional systems studied (A + A and C + Au); however, it will be very hard to extract a robust signal experimentally. Since we find only small traces of a µB dependence in heavy-ion observables -although the effective partonic masses and widths as well as their partonic cross sections clearly depend on µB -this implies that one needs a sizable partonic density and large space-time QGP volume to explore the dynamics in the partonic phase. These conditions are only fulfilled at high bombarding energies where µB is, however, rather low. On the other hand, when decreasing the bombarding energy and thus increasing µB, the hadronic phase becomes dominant and accordingly it will be difficult to extract signals from the partonic dynamics based on "bulk" observables.

show abstract

Section: Introductionmentioning

confidence: 99%

Exploring the partonic phase at finite chemical potential within an extended off-shell transport approach

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The gradient of the potential energy density with respect to the scalar density generates a repulsive force in relativistic heavy-ion collisions and plays an essential role in reproducing experimental flow data and transverse momentum spectra. We recall that the PHSD approach has successfully described numerous experimental data in relativistic heavy-ion collisions from the Super Proton Synchrotron (SPS) to Large Hadron Collider (LHC) energies [17][18][19][20]; a review on bulk and electromagnetic properties of relativistic heavy-ion reactions within PHSD can be found in Ref. [21].…”

Section: Introductionmentioning

confidence: 99%

Charm production in Pb + Pb collisions at energies available at the CERN Large Hadron Collider

et al. 2016

View full text Add to dashboard Cite

We study charm production in Pb+Pb collisions at √ sNN =2.76 TeV in the Parton-Hadron-StringDynamics transport approach and the charm dynamics in the partonic and hadronic medium. The charm quarks are produced through initial binary nucleon-nucleon collisions by using the PYTHIA event generator taking into account the (anti-)shadowing incorporated in the EPS09 package. The produced charm quarks interact with off-shell massive partons in the quark-gluon plasma and are hadronized into D mesons through coalescence or fragmentation close to the critical energy density, and then interact with hadrons in the final hadronic stage with scattering cross sections calculated in an effective Lagrangian approach with heavy-quark spin symmetry. The PHSD results show a reasonable RAA and elliptic flow of D mesons in comparison to the experimental data for Pb+Pb collisions at √ sNN = 2.76 TeV from the ALICE Collaboration. We also study the effect of temperature-dependent off-shell charm quarks in relativistic heavy-ion collisions. We find that the scattering cross sections are only moderately affected by off-shell charm degrees of freedom. However, the position of the peak of RAA for D mesons depends on the strength of the scalar partonic forces which also have an impact on the D meson elliptic flow. The comparison with experimental data on the RAA suggests that the repulsive force is weaker for off-shell charm quarks as compared to that for light quarks. Furthermore, the effects from radiative charm energy loss appear to be low compared to the collisional energy loss up to transverse momenta of ∼ 15 GeV/c.

show abstract

“…We recall that the PHSD approach has successfully described numerous experimental data in relativistic heavyion collisions from the Super Proton Synchrotron (SPS) to LHC energies [25][26][27][28]. More recently, the charm production and propagation has been explicitly implemented in the PHSD and detailed studies on the charm dynamics and hadronization/fragmention have been performed at top RHIC and LHC energies in comparison to the available data [29,30].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

View full text Add to dashboard Cite

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.

show abstract

Impact of the initial size of spatial fluctuations on the collective flow in Pb–Pb collisions at $\sqrt{{{s}_{{\rm NN}}}}$ = 2.76 TeV

Cited by 30 publications

References 80 publications

Exploring the partonic phase at finite chemical potential within an extended off-shell transport approach

Exploring the partonic phase at finite chemical potential within an extended off-shell transport approach

Charm production in Pb + Pb collisions at energies available at the CERN Large Hadron Collider

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

Contact Info

Product

Resources

About