System Size, Energy, Pseudorapidity, and Centrality Dependence of Elliptic Flow

Alver, B.; Back, B. B.; Baker, M. D.; Ballintijn, M.; Barton, D. S.; Betts, R. R.; Bickley, A. A.; Bindel, R.; Busza, W.; Carroll, A.; Chai, Z.; Chetluru, V.; Decowski, M. P.; Garcia, E. Oliver; Gburek, T.; George, N.; Gulbrandsen, K.; Halliwell, C.; Hamblen, J.; Harnarine, I.; Hauer, M.; Henderson, C.; Hofman, D. J.; Hollis, R. S.; Hołyński, R.; Holzman, B.; Iordanova, A.; Johnson, E.; Kane, J. L.; Khan, Nawazish A.; Kulinich, P.; Kuo, C. M.; Li, W.; Lin, W.; Loizides, C.; Manly, S.; Mignerey, A. C.; Nouicer, R.; Olszewski, A.; Pak, R.; Reed, C.; Richardson, E.; Roland, C.; Roland, G.; Sagerer, J.; Seals, H.; Sedykh, I.; Smith, Christopher; Stankiewicz, M. A.; Steinberg, P.; Stephans, G. S. F.; Sukhanov, A.; Szostak, A.; Tonjes, M. B.; Trzupek, A.; Vale, C.; Nieuwenhuizen, G. J. van; Vaurynovich, S. S.; Verdier, R.; Veres, G. I.; Walters, Patrick; Wenger, E. A.; Willhelm, D.; Wolfs, F. L. H.; Wosiek, B. K.; Woźniak, K. W.; Wyngaardt, S.; Wysłouch, B.

doi:10.1103/physrevlett.98.242302

Cited by 329 publications

(201 citation statements)

References 30 publications

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“…The participant eccentricity is the initial configuration space eccentricity of the participants, which is defined by [56] …”

Section: Centrality and System-size Dependencementioning

confidence: 99%

Charged and strange hadron elliptic flow inCu+Cucollisions atsNN=
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
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4
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We present the results of an elliptic flow, v 2 , analysis of Cu + Cu collisions recorded with the solenoidal tracker detector (STAR) at the BNL Relativistic Heavy Ion Collider at √ s NN = 62.4 and 200 GeV. Elliptic flow as a function of transverse momentum, v 2 (p T ), is reported for different collision centralities for charged hadrons h ± and strangeness-ontaining hadrons K 0 S , , , and φ in the midrapidity region |η| < 1.0. Significant reduction in systematic uncertainty of the measurement due to nonflow effects has been achieved by correlating particles at midrapidity, |η| < 1.0, with those at forward rapidity, 2.5 < |η| < 4.0. We also present azimuthal correlations in p + p collisions at (2010) energy, m T − m, and (ii) at intermediate p T , 2 < p T < 4 GeV/c, it scales with the number of constituent quarks, n q . We have found that ideal hydrodynamic calculations fail to reproduce the centrality dependence of v 2 (p T ) for K 0 S and . Eccentricity scaled v 2 values, v 2 /ε, are larger in more central collisions, suggesting stronger collective flow develops in more central collisions. The comparison with Au + Au collisions, which go further in density, shows that v 2 /ε depends on the system size, that is, the number of participants N part . This indicates that the ideal hydrodynamic limit is not reached in Cu + Cu collisions, presumably because the assumption of thermalization is not attained.

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“…The participant eccentricity is the initial configuration space eccentricity of the participants, which is defined by [56] …”

Section: Centrality and System-size Dependencementioning

confidence: 99%

Charged and strange hadron elliptic flow inCu+Cucollisions atsNN=
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
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59
4
23
0
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“…The study of anisotropies in the azimuthal distribution of produced particles, commonly called anisotropic flow, has contributed significantly to the characterization of the system created in heavy-ion collisions [1][2][3][4][5]. According to the current paradigm of bulk particle production, anisotropic flow is determined by the response of the system to its initial spatial anisotropies.…”

Section: Introductionmentioning

confidence: 99%

“…According to the current paradigm of bulk particle production, anisotropic flow is determined by the response of the system to its initial spatial anisotropies. Initial-state spatial anisotropies come in turn from both the geometry of the collision and fluctuations in the wave function of the incident nuclei [3][4][5][6][7][8]. The significant magnitude of anisotropic flow is interpreted as evidence of the formation of a stronglycoupled system, which can effectively be described as a fluid with very low shear viscosity to entropy-density ratio (η/s) [9].…”

Section: Introductionmentioning

confidence: 99%

Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ and 2.76 TeV

Acharya

Acosta

Adamová

et al. 2018

J. High Energ. Phys.

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Measurements of anisotropic flow coefficients with two-and multi-particle cumulants for inclusive charged particles in Pb-Pb collisions at √ s NN = 5.02 and 2.76 TeV are reported in the pseudorapidity range |η| < 0.8 and transverse momentum 0.2 < p T < 50 GeV/c. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) µb −1 in the centrality range 0-80%, is analysed. Flow coefficients up to the sixth flow harmonic (v 6 ) are reported and a detailed comparison among results at the two energies is carried out. The p T dependence of anisotropic flow coefficients and its evolution with respect to centrality and harmonic number n are investigated. An approximate power-law scaling of the form v n (p T ) ∼ p n/3 T is observed for all flow harmonics at low p T (0.2 < p T < 3 GeV/c). At the same time, the ratios v n /v n/m m are observed to be essentially independent of p T for most centralities up to about p T = 10 GeV/c. Analysing the differences among higher-order cumulants of elliptic flow (v 2 ), which have different sensitivities to flow fluctuations, a measurement of the standardised skewness of the event-by-event v 2 distribution P (v 2 ) is reported and constraints on its higher moments are provided. The Elliptic Power distribution is used to parametrise P (v 2 ), extracting its parameters from fits to cumulants. The measurements are compared to different model predictions in order to discriminate among initial-state models and to constrain the temperature dependence of the shear viscosity to entropy-density ratio.

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“…[47]. The one referred to as "participant eccentricity" which characterizes the initial state through the event-by-event distribution of the participant nucleons or partons has been found to be crucial for understanding the initial properties [35]. The participant eccentricity for initial elliptic anisotropy is given by…”

Section: Brief Description Of Ampt Modelmentioning

confidence: 99%

Initial partonic eccentricity fluctuations in a multiphase transport model

2016

Phys. Rev. C

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Initial partonic eccentricities in Au+Au collisions at center-of-mass energy √ sNN = 200 GeV are investigated using a multi-phase transport model with string melting scenario. The initial eccentricities in different order of harmonics are studied using participant and cumulant definitions. Eccentricity in terms of second-, fourth-and sixth order cumulants as a function of number of participant nucleons are compared systematically with the traditional participant definition. The ratio of the cumulant eccentricities ε {4} /ε {2} and ε {6} /ε {4} are studied in comparison with the ratio of the corresponding flow harmonics. The conversion coefficients (vn/εn) are explored up to fourth order harmonic based on cumulant method. Furthermore, studies on transverse momentum (pT ) and pseudo-rapidity (η) dependencies of eccentricities and their fluctuations are presented. As in ideal hydrodynamics initial eccentricities are expected to be closely related to the final flow harmonics in relativistic heavy-ion collisions, studies of the fluctuating initial condition in the AMPT model will shed light on the tomography properties of the initial source geometry.

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System Size, Energy, Pseudorapidity, and Centrality Dependence of Elliptic Flow

Cited by 329 publications

References 30 publications

Charged and strange hadron elliptic flow inCu+Cucollisions atsNN=
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
Self Cite
59
4
23
0
View full text Add to dashboard Cite

Charged and strange hadron elliptic flow inCu+Cucollisions atsNN=
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
Self Cite
59
4
23
0
View full text Add to dashboard Cite

Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ and 2.76 TeV

Initial partonic eccentricity fluctuations in a multiphase transport model

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System Size, Energy, Pseudorapidity, and Centrality Dependence of Elliptic Flow

Cited by 329 publications

References 30 publications

Charged and strange hadron elliptic flow inCu+Cucollisions atsNN=Abelev1, Aggarwal2, Ahammed3 et al. 2010Phys. Rev. CSelf Cite594230View full textAdd to dashboardCite

Charged and strange hadron elliptic flow inCu+Cucollisions atsNN=Abelev1, Aggarwal2, Ahammed3 et al. 2010Phys. Rev. CSelf Cite594230View full textAdd to dashboardCite

Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ and 2.76 TeV

Initial partonic eccentricity fluctuations in a multiphase transport model

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Charged and strange hadron elliptic flow inCu+Cucollisions atsNN=
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
Self Cite
59
4
23
0
View full text Add to dashboard Cite

Charged and strange hadron elliptic flow inCu+Cucollisions atsNN=
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
Self Cite
59
4
23
0
View full text Add to dashboard Cite