Centrality dependence of multiplicity, transverse energy, and elliptic flow from hydrodynamics

Kolb, Peter F.; Heinz, Ulrich; Huovinen, Pasi; Eskola, Kari J.; Tuominen, Kimmo

doi:10.1016/s0375-9474(01)01114-9

Cited by 327 publications

(388 citation statements)

References 32 publications

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“…(2) may not be applicable, it is nevertheless interesting that the data do exhibit such a behavior. This ordering follows naturally from hydrodynamics, where flow decreases with increasing particle mass [9,11,10]. Similar mass dependence could also arise in a coalescence model because heavier hadrons can be formed by quarks with larger relative momentum (ignored in the local coalescence approach).…”

Section: Elliptic Flow Amplification and Orderingmentioning

confidence: 70%

“…As illustrated in Fig. 1, the saturation pattern differs qualitatively from calculations based on a variety of different models: ideal (nondissipative) hydrodynamics [9,11,10,12], hadronic cascades with string dynamics [13], inelastic parton energy loss [2], and classical YangMills evolution [14].…”

Section: Introductionmentioning

confidence: 87%

“…Nevertheless, quantitative agreement with the v 2 (p ⊥ ) data is possible, provided initial parton densities and/or cross sections are enhanced by an order of magnitude to σdN g /dη(b = 0) ∼ 45 000 mb [3]. An [2,14,9,11,10,12,13]. enhancement of parton opacities seems necessary to explain the pion interferometry data from RHIC as well [19].…”

Section: Introductionmentioning

confidence: 99%

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Meson and baryon elliptic flow at highp_Tfrom parton coalescence

Molnár¹

2003

J. Phys. G: Nucl. Part. Phys.

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Abstract. The large and saturating differential elliptic flow v 2 (p ⊥ ) observed in Au + Au reactions at RHIC so far could only be explained assuming an order of magnitude denser initial parton system than estimated from perturbative QCD. Hadronization via parton coalescence can resolve this "opacity puzzle" because it enhances hadron elliptic flow at large p ⊥ relative to that of partons at the same transverse momentum. An experimentally testable consequence of the coalescence scenario is that v 2 (p ⊥ ) saturates at about 50% higher values for baryons than for mesons. In addition, if strange quarks have weaker flow than light quarks, hadron v 2 at high p ⊥ decreases with relative strangeness content.

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Section: Elliptic Flow Amplification and Orderingmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Meson and baryon elliptic flow at highp_Tfrom parton coalescence

Molnár¹

2003

J. Phys. G: Nucl. Part. Phys.

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“…However, conclusions remained largely limited to the qualitative statement that the observed flow in semi-central collisions "retains some signature of the pressure in the high density region created during the initial collision" [5]. This changed soon after the start of the Relativistic Heavy Ion Collider (RHIC) in the year 2000, when several groups [6][7][8][9] noted that fluid dynamic simulations of Au+Au collisions at √ s NN < 200 GeV can account quantitatively for the main manifestations of collectivity at RHIC, including the dominant elliptic flow signal at mid rapidity and its dependencies on transverse momentum, centrality and particle species. These studies were based on simplified 2+1-dimensional simulations, following Bjorken's argument that the initial conditions for fluid dynamic fields are close to longitudinally boost-invariant, and that this boost-invariance is preserved by the fluid dynamics [10].…”

Section: Jhep11(2011)100mentioning

confidence: 99%

Fluctuations around Bjorken flow and the onset of turbulent phenomena

Floerchinger

Wiedemann

2011

J. High Energ. Phys.

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We study how fluctuations in fluid dynamic fields can be dissipated or amplified within the characteristic spatio-temporal structure of a heavy ion collision. The initial conditions for a fluid dynamic evolution of heavy ion collisions may contain significant fluctuations in all fluid dynamical fields, including the velocity field and its vorticity components. We formulate and analyze the theory of local fluctuations around average fluid fields described by Bjorken's model. For conditions of laminar flow, when a linearized treatment of the dynamic evolution applies, we discuss explicitly how fluctuations of large wave number get dissipated while modes of sufficiently long wave-length pass almost unattenuated or can even be amplified. In the opposite case of large Reynold's numbers (which is inverse to viscosity), we establish that (after suitable coordinate transformations) the dynamics is governed by an evolution equation of non-relativistic Navier-Stokes type that becomes essentially two-dimensional at late times. One can then use the theory of Kolmogorov and Kraichnan for an explicit characterization of turbulent phenomena in terms of the wave-mode dependence of correlations of fluid dynamic fields. We note in particular that fluid dynamic correlations introduce characteristic power-law dependences in two-particle correlation functions.

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“…[23] to set the initial energy density and baryon number density with the wounded nucleon number density,…”

Section: Medium Evolutionmentioning

confidence: 99%

J/ψ transport in QGP and pt distribution at SPS and RHIC

Zhu

Zhuang

2005

Physics Letters B

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Combining the hydrodynamic equations for the QGP evolution and the transport equation for the primordially produced J/ψ in the QGP, we investigate the J/ψ transverse momentum distribution as well as its suppression in the √ s=17.3A GeV Pb-Pb collisions at SPS and √ s=200A GeV Au-Au collisions at RHIC. The two sets of equations are connected by the J/ψ anomalous suppression induced by its inelastic scattering with gluons in the QGP. The calculated centrality dependence of J/ψ suppression and average transverse momentum square agree well with the SPS data. From the comparison with the coalescence model where charm quark is fully thermalized, our calculated elliptical flow of the primordially produced J/ψ is much smaller. This may be helpful to differentiate the J/ψ production mechanisms in relativistic heavy ion collisions.

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Centrality dependence of multiplicity, transverse energy, and elliptic flow from hydrodynamics

Cited by 327 publications

References 32 publications

Meson and baryon elliptic flow at highp_Tfrom parton coalescence

Meson and baryon elliptic flow at highp_Tfrom parton coalescence

Fluctuations around Bjorken flow and the onset of turbulent phenomena

J/ψ transport in QGP and pt distribution at SPS and RHIC

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Centrality dependence of multiplicity, transverse energy, and elliptic flow from hydrodynamics

Cited by 327 publications

References 32 publications

Meson and baryon elliptic flow at highpTfrom parton coalescence

Meson and baryon elliptic flow at highpTfrom parton coalescence

Fluctuations around Bjorken flow and the onset of turbulent phenomena

J/ψ transport in QGP and pt distribution at SPS and RHIC

Contact Info

Product

Resources

About

Meson and baryon elliptic flow at highp_Tfrom parton coalescence

Meson and baryon elliptic flow at highp_Tfrom parton coalescence