Anisotropic flow at RHIC: How unique is the number-of-constituent-quark scaling?

Abstract

The transverse momentum dependence of the anisotropic flow $v_2$ for $\pi$, $K$, nucleon, $\Lambda$, $\Xi$ and $\Omega$ is studied for Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV within two independent string-hadron transport approaches (RQMD and UrQMD). Although both models reach only 60% of the absolute magnitude of the measured $v_2$, they both predict the particle type dependence of $v_2$, as observed by the RHIC experiments: $v_2$ exhibits a hadron-mass hierarchy (HMH) in the low $p_T$ region and a number-of-constituent-quark (NCQ) dependence in the intermediate $p_T$ region. The failure of the hadronic models to reproduce the absolute magnitude of the observed $v_2$ indicates that transport calculations of heavy ion collisions at RHIC must incorporate interactions among quarks and gluons in the early, hot and dense phase. The presence of an NCQ scaling in the string-hadron model results suggests that the particle-type dependencies observed in heavy-ion collisions at intermediate $p_T$ might be related to the hadronic cross sections in vacuum rather than to the hadronization process itself.

arXiv comment10 pages, 5 figures; A new author (H. Petersen) is added; A new figure (fig.1) on time evolution of elliptic flow and number of collisions is added; Version accepted for publication in J. Phys. G

References in corpus (40)

• Microscopic Models for Ultrarelativistic Heavy Ion Collisions
• Relativistic Hadron-Hadron Collisions in the Ultra-Relativistic Quantum Molecular Dynamics Model (UrQMD)
• Elliptic Flow of Identified Hadrons in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Elliptic flow in Au+Au collisions at sqrt(s_NN) = 130 GeV
• Azimuthal anisotropy in Au+Au collisions at sqrtsNN = 200 GeV
• Elliptic flow at large transverse momenta from quark coalescence
• Particle-type dependence of azimuthal anisotropy and nuclear modification of particle production in Au+Au collisions at s(NN)**(1/2) = 200-GeV
• Collective Flow signals the Quark Gluon Plasma
• Flavor Production in Pb(160AGeV) on Pb Collisions: Effect of Color Ropes and Hadronic Rescattering
• Elliptical flow -- a signature for early pressure in ultrarelativistic nucleus-nucleus collisions
• Dynamics of Hot Bulk QCD Matter: from the Quark-Gluon Plasma to Hadronic Freeze-Out
• Signatures of Quark-Gluon-Plasma formation in high energy heavy-ion collisions: A critical review
• Evidence of early multi-strange hadron freeze-out in high energy nuclear collisions
• Phi meson production in Au+Au and p+p collisions at sqrt (s)=200 GeV
• Strangeness dynamics and transverse pressure in relativistic nucleus-nucleus collisions
• Equation of State, Radial Flow and Freeze-out in High Energy Heavy Ion Collisions
• Anisotropic flow in ultra-relativistic heavy ion collisions
• Resonance decay effects on anisotropy parameters
• Recombination of shower partons in fragmentation processes
• Hadronic freeze-out following a first order hadronization phase transition in ultrarelativistic heavy-ion collisions
• Freeze out in hydrodynamical models
• Elliptic Flow Analysis at RHIC: Fluctuations vs. Non-Flow Effects
• Direct Emission of multiple strange baryons in ultrarelativistic heavy-ion collisions from the phase boundary
• Anisotropic flow of charged and identified hadrons in the quark-gluon string model for Au+Au collisions at sqrt(s) = 200 GeV
• Statistical Mechanics of semi-classical colored Objects
• Freeze-out in hydrodynamical models in relativistic heavy ion collisions
• Passage of charmed particles through the mixed phase in high-energy heavy-ion collisions
• 3-D hydro + cascade model at RHIC
• Reaction dynamics in Pb+Pb at the CERN/SPS: from partonic degrees of freedom to freeze-out
• Microscopic coloured quark-dynamics in the soft non-perturbative regime -- Description of hadron formation in relativistic S+Au collisions at CERN
• Elliptic Flow Analysis at RHIC with the Lee-Yang Zeroes Method in a Relativistic Transport Approach
• Thermalization of gluons at RHIC including gg <-> ggg interactions in a parton cascade
• Hadron Correlations from Recombination and Fragmentation
• What can we learn from hydrodynamic analysis of elliptic flow?
• What can we learn from hydrodynamic analysis at RHIC?
• Fluctuations of the Elliptic Flow
• Azimuthal Anisotropy of Identified Hadrons in 200 GeV Au+Au Collisions
• Charm -- a thermometer of the mixed phase
• Nonequilibrium dynamics of a hadronizing quark-gluon plasma
• Multifragmentation, Clustering, and Coalescence in Nuclear Collisions

Cited by in corpus (19)

• Mass, quark-number, and $\sqrt{s_{NN}}$ dependence of the second and fourth flow harmonics in ultra-relativistic nucleus-nucleus collisions
• Directed and elliptic flow in heavy ion collisions from $E_{\mathrm{beam}}=90$ MeV/nucleon to $E_{c.m.}=200$ GeV/nucleon
• Charged and strange hadron elliptic flow in Cu+Cu collisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV
• Probe the QCD phase diagram with ϕ-mesons in high energy nuclear collisions
• Differential elliptic flow of identified hadrons and constituent quark number scaling at FAIR
• Elliptic Flow: A Study of Space-Momentum Correlations In Relativistic Nuclear Collisions
• Energy, centrality and momentum dependence of dielectron production at collider energies in a coarse-grained transport approach
• Predictions for the LHC heavy ion programme
• Pseudorapidity shape of elliptic flow as signature for fast equilibration in relativistic heavy-ion collisions at energies up to sqrt(s) = 200 GeV
• Simulation study of elliptic flow of charged hadrons produced in Au + Au collisions at the Facility for Antiproton and Ion Research
• Investigating the NCQ scaling of elliptic flow at LHC with a multiphase transport model
• Quasi-Particle Degrees of Freedom versus the Perfect Fluid as Descriptors of the Quark-Gluon Plasma
• Evidence from Identified Particles for Active Quark and Gluon Degrees of Freedom
• Strange hadron and resonance production in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV with ALICE experiment at LHC
• Decreasing elliptic flow at the LHC: Calculations in a parton recombination approach
• Hadronic resonance production in Pb-Pb collisions at the ALICE experiment
• Studies of heavy-ion collisions using PYTHIA Angantyr and UrQMD
• Transport-model investigation of scaling of the number of constituent quarks and the hadronic-partonic transition in Au + Au collisions
• Hadronic Rescattering in pA and AA Collisions