Impact of the initial size of spatial fluctuations on the collective flow in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV

Abstract

The Parton-Hadron-String-Dynamics (PHSD) transport model is used to study the influence of the initial size of spatial fluctuations of the interacting system on flow observables in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV for different centralities. While the flow coefficients $v_2$, $v_3$, $v_4$ and $v_5$ are reasonably described in comparison to the data from the ALICE Collaboration for different centralities within the default setting, no essential sensitivity is found with respect to the initial size of spatial fluctuations even for very central collisions where the flow coefficients are dominated by the size of initial state fluctuations. We attribute this lack of sensitivity partly to the low interaction rate of the degrees-of-freedom in this very early phase of order $\sim$ 0.3 fm/c which is also in common with the weakly interacting color glass condensate (CGC) or glasma approach. Moreover, since the event shape in the transverse plane is approximately the same for different size of spatial fluctuations very similar eccentricities ${\epsilon }_n$ are transformed to roughly the same flow coefficients $v_n$ in momentum space.

15 pages, 8 figures. arXiv admin note: text overlap with arXiv:1401.4409

References in corpus (16)

• The Color Glass Condensate
• Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?
• 200 A GeV Au+Au collisions serve a nearly perfect quark-gluon liquid
• Event-by-event gluon multiplicity, energy density and eccentricities at RHIC and LHC
• Space-time evolution of bulk QCD matter
• Translation of collision geometry fluctuations into momentum anisotropies in relativistic heavy-ion collisions
• CGC predictions for p+Pb collisions at the LHC
• From Kadanoff-Baym dynamics to off-shell parton transport
• Eccentric protons? Sensitivity of flow to system size and shape in p+p, p+Pb and Pb+Pb collisions
• Dynamical quasiparticles properties and effective interactions in the sQGP
• Transport rates and momentum isotropization of gluon matter in ultrarelativistic heavy-ion collisions
• Dynamical phase trajectories for relativistic nuclear collisions
• Charge-dependent directed flow in asymmetric nuclear collisions
• Eccentricity fluctuations in an integrated hybrid approach: Influence on elliptic flow
• Dilepton production in proton-proton and Pb+Pb collisions at sqrt(s_NN)=2.76 TeV
• Dependence of elliptic flow on number of parton degrees of freedom

Cited by in corpus (1)

• Observables in ultrarelativistic heavy-ion collisions from two different transport approaches for the same initial conditions