Collective flow in 2.76 and 5.02 A TeV Pb + Pb collisions

Zhao, W.; Xu, H.; Song, Huichao

doi:10.1140/epjc/s10052-017-5186-x

Cited by 100 publications

(87 citation statements)

References 87 publications

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“…Note that |∆η| > 0 suggests that there is no separation in pseudorapidity between the two sub-events. Short-range correlations, one of the main sources of non-flow effects, are expected to be suppressed MC-Glauber initial conditions and η/s = 0.08 [33], with MC-KLN initial conditions and η/s = 0.20 [33], with Trento initial conditions and temperature dependent η/s [60] and AMPT initial conditions and η/s = 0.08 [60] are shown in green dot-dash, orange dashed curves, and magenta and grey shaded areas, respectively.…”

Section: Pb-pb Collisionsmentioning

confidence: 99%

“…The results are also compared to the original predictions within the VISH2+1 hydrodynamic framework with: 1) Monte Carlo Glauber (MC-Glauber) initial conditions and η/s = 0.08; 2) Monte Carlo KharzeevLevin-Nardi (MC-KLN) initial conditions and η/s = 0.20 [33]. In addition, the comparisons to recently released calculations from the iEBE-VISHNU hydrodynamic framework with: 1) Trento initial conditions, temperature dependent shear and bulk viscosities, η/s(T) and ζ(T); and 2) AMPT initial conditions with η/s = 0.08 [60] are also presented. These combinations of various initial conditions and η/s are chosen due to the fact that they give the best descriptions of the particle spectra and the integrated flow measurements [60,61].…”

Section: Pb-pb Collisionsmentioning

confidence: 99%

“…In addition, the comparisons to recently released calculations from the iEBE-VISHNU hydrodynamic framework with: 1) Trento initial conditions, temperature dependent shear and bulk viscosities, η/s(T) and ζ(T); and 2) AMPT initial conditions with η/s = 0.08 [60] are also presented. These combinations of various initial conditions and η/s are chosen due to the fact that they give the best descriptions of the particle spectra and the integrated flow measurements [60,61]. The four hydrodynamic calculations describe the v 2 {2} very well up to p T ≈ 2 GeV/c at least for central and semi-central collisions, as do the calculations with MC-Glauber, MC-KLN and AMPT initial conditions for the v 2 [2].…”

Section: Pb-pb Collisionsmentioning

confidence: 99%

“…In order to probe the p T -dependent flow vector fluctuations quantitatively, the ratio [33], with Trento initial conditions and temperature dependent η/s [60] and AMPT initial conditions and η/s = 0.08 [60] are shown in green dot-dashed and orange dashed curves, and magenta and grey shaded areas, respectively. different centrality classes in figure 3.…”

Section: Pb-pb Collisionsmentioning

confidence: 99%

“…This accidental agreement needs further investigations in the iEBE-VISHNU framework to understand the physics mechanism responsible for this behaviour. Hydrodynamic calculations with MC-Glauber initial conditions and η/s = 0.08 [33], with MC-KLN initial conditions and η/s = 0.20 [33], with Trento initial conditions and temperature dependent η/s [60] and AMPT initial conditions and η/s = 0.08 [60] are shown in green dot-dash, orange dashed curves, and magenta and grey shaded areas, respectively. The different panels show the centrality evolution of the measurements.…”

Section: Pb-pb Collisionsmentioning

confidence: 99%

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Searches for transverse momentum dependent flow vector fluctuations in Pb-Pb and p-Pb collisions at the LHC

Acharya¹,

Adamová²,

Adolfsson³

et al. 2017

J. High Energ. Phys.

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The measurement of azimuthal correlations of charged particles is presented for Pb-Pb collisions at √ s NN = 2.76 TeV and p-Pb collisions at √ s NN = 5.02 TeV with the ALICE detector at the CERN Large Hadron Collider. These correlations are measured for the second, third and fourth order flow vector in the pseudorapidity region |η| < 0.8 as a function of centrality and transverse momentum p T using two observables, to search for evidence of p T -dependent flow vector fluctuations. For Pb-Pb collisions at 2.76 TeV, the measurements indicate that p T -dependent fluctuations are only present for the second order flow vector. Similar results have been found for p-Pb collisions at 5.02 TeV. These measurements are compared to hydrodynamic model calculations with event-by-event geometry fluctuations in the initial state to constrain the initial conditions and transport properties of the matter created in Pb-Pb and p-Pb collisions. The ALICE collaboration 26 Keywords: Heavy Ion Experiments IntroductionThe primary goal of ultrarelativistic heavy-ion collisions is to study the properties of the Quark-Gluon Plasma (QGP), a state of matter predicted by Quantum Chromodynamics to exist at high temperatures and energy densities [1,2]. An important experimental observable used to accomplish this goal is the azimuthal anisotropy of particles emitted in the transverse plane. In non-central heavy-ion collisions, the overlap region of the Lorentzcontracted nuclei is roughly almond-shaped. Nucleons contained in such anisotropic overlap region interact with each other and give rise to a system of high energy density which expands anisotropically. These interactions convert the initial spatial asymmetry into a final-state momentum anisotropy of the produced particles, a phenomenon referred to as collective anisotropic flow [3][4][5]. Anisotropic flow is characterised using a Fourier decomposition of the azimuthal distribution of particles with respect to the flow symmetry planes [6, 7] 1) where N is the number of produced particles, E is the energy, p the momentum, p T the transverse momentum, ϕ the azimuthal angle and η the pseudorapidity of the particle. The n th order flow (vector) V n is defined as: V n ≡ v n e inΨn , where v n is the flow coefficient, and Ψ n represents the azimuth of V n in momentum space (flow angle). For a uniform matter distribution in the initial stage of a heavy-ion collision, Ψ n for n ≥ 1 coincides with the reaction plane defined by the beam direction and impact parameter. Due to event-by-event fluctuations of the participating nucleons distribution inside the overlap region, the Ψ n may -1 - JHEP09(2017)032deviate from the reaction plane and the odd flow coefficients v 2n−1 are non-vanishing [8][9][10][11][12][13][14]. Large flow coefficients were observed at the Relativistic Heavy-Ion Collider (RHIC) [15][16][17][18] and the Large Hadron Collider (LHC) [19][20][21][22][23][24][25][26][27][28][29]. These measurements constrain the initial conditions (e.g. energy and entropy density) and transpo...

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Section: Pb-pb Collisionsmentioning

confidence: 99%

Section: Pb-pb Collisionsmentioning

confidence: 99%

Section: Pb-pb Collisionsmentioning

confidence: 99%

Section: Pb-pb Collisionsmentioning

confidence: 99%

Section: Pb-pb Collisionsmentioning

confidence: 99%

See 3 more Smart Citations

Searches for transverse momentum dependent flow vector fluctuations in Pb-Pb and p-Pb collisions at the LHC

Acharya¹,

Adamová²,

Adolfsson³

et al. 2017

J. High Energ. Phys.

View full text Add to dashboard Cite

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Strange and Non-strange Light-Flavour Hadron Production in Pb–Pb and p–Pb Collisions at LHC Energies with ALICE

Šefčík

2020

Springer Proceedings in Physics

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Higher harmonic non-linear flow modes of charged hadrons in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 5.02 TeV

Acharya¹,

Adamová²,

Adler³

et al. 2020

J. High Energ. Phys.

View full text Add to dashboard Cite

Anisotropic flow coefficients, v n , non-linear flow mode coefficients, χ n,mk , and correlations among different symmetry planes, ρ n,mk are measured in Pb-Pb collisions at √ s NN = 5.02 TeV. Results obtained with multi-particle correlations are reported for the transverse momentum interval 0.2 < p T < 5.0 GeV/c within the pseudorapidity interval 0.4 < |η| < 0.8 as a function of collision centrality. The v n coefficients and χ n,mk and ρ n,mk are presented up to the ninth and seventh harmonic order, respectively. Calculations suggest that the correlations measured in different symmetry planes and the non-linear flow mode coefficients are dependent on the shear and bulk viscosity to entropy ratios of the medium created in heavy-ion collisions. The comparison between these measurements and those at lower energies and calculations from hydrodynamic models places strong constraints on the initial conditions and transport properties of the system.

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Collective flow in 2.76 and 5.02 A TeV Pb + Pb collisions

Cited by 100 publications

References 87 publications

Searches for transverse momentum dependent flow vector fluctuations in Pb-Pb and p-Pb collisions at the LHC

Searches for transverse momentum dependent flow vector fluctuations in Pb-Pb and p-Pb collisions at the LHC

Strange and Non-strange Light-Flavour Hadron Production in Pb–Pb and p–Pb Collisions at LHC Energies with ALICE

Higher harmonic non-linear flow modes of charged hadrons in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 5.02 TeV

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