Investigation of the Elliptic Flow Fluctuations of the Identified Particles Using the a Multi-Phase Transport Model

Magdy, Niseem; Sun, X. M.; Ye, Zhenyu; Evdokimov, O.; Lacey, R.

doi:10.3390/universe6090146

Cited by 19 publications

(15 citation statements)

References 71 publications

(79 reference statements)

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“…Shear viscosity, however, dampens the development of this anisotropy. It is thus commonly considered that models of the system expansion without and with tunable viscous forces may enable a reasonably accurate determination of the magnitude of η/s in the QGP [5,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Azimuthal dependence of two-particle transverse momentum current correlations

et al. 2021

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Two-particle transverse momentum correlation functions are a powerful technique for understanding the dynamics of relativistic heavy-ion collisions. Among these, the transverse momentum correlator $$G_{2}\left( \varDelta \eta ,\varDelta \varphi \right) $$ G 2 Δ η , Δ φ is of particular interest for its potential sensitivity to the shear viscosity per unit of entropy density $$\eta /s$$ η / s of the quark-gluon plasma formed in heavy-ion collisions. We use the UrQMD, AMPT, and EPOS models for Au–Au at $$\sqrt{s_\mathrm{NN}}$$ s NN = 200 GeV and Pb–Pb at $$\sqrt{s_\mathrm{NN}}$$ s NN = 2760 GeV to investigate the long range azimuthal dependence of $$G_{2}\left( \varDelta \eta ,\varDelta \varphi \right) $$ G 2 Δ η , Δ φ , and explore its utility to constrain $$\eta /s$$ η / s based on charged particle correlations. We find that the three models yield quantitatively distinct transverse momentum Fourier harmonics coefficients $$a^{p_\mathrm{T}}_{n}$$ a n p T . We also observe these coefficients exhibit a significant dependence on $$\eta /s$$ η / s in the context of the AMPT model. These observations suggest that exhaustive measurements of the dependence of $$G_{2}\left( \varDelta \varphi \right) $$ G 2 Δ φ with collision energy, system size, collision centrality, in particular, offer the potential to distinguish between different theoretical models and their underlying assumptions. Exhaustive analyses of $$G_{2}\left( \varDelta \varphi \right) $$ G 2 Δ φ obtained in large and small systems should also be instrumental in establishing new constraints for precise extraction of $$\eta /s$$ η / s .

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Section: Introductionmentioning

confidence: 99%

Azimuthal dependence of two-particle transverse momentum current correlations

et al. 2021

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“…Anisotropic flow (v n ) measurements, made as a function of collision centrality and transverse momentum (p T ), have played a central role in such extractions. This is because they constrain the viscous hydrodynamic response to the spatially-anisotropic energy-density distribution produced in the initial stages of the collision [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Model study of the energy dependence of the correlation between anisotropic flow and the mean transverse momentum in Au+Au collisions

Magdy,

Parfenov,

Taranenko

et al. 2021

Preprint

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A hybrid model that employs the hadron-string transport model UrQMD and the (3+1)D relativistic viscous hydrodynamic code vHLLE, is used to investigate the beam energy dependence of the correlation coefficient ρ(v 2 2 , [pT ]) between the average transverse momentum [pT ] of hadrons emitted in an event and the square of the anisotropic flow coefficient v 2 2 . For Au+Au collisions, the model predicts characteristic patterns for the energy and event-shape dependence of the variances for [pT ] and v 2 n (Var([pT ]) and Var(v 2 2 )), and the covariance of v 2 n and [pT ] (cov(v 2 2 , [pT ])), consistent with the attenuation effects of the specific shear viscosity η/s. In contrast, ρ(v 2 2 , [pT ]) is predicted to be insensitive to the beam energy but sensitive to the initial-state geometry of the collisions. These observations suggest that a precise set of measurements for Var ([pT ]), Var(v 2 2 ), cov(v 2 2 , [pT ]) and ρ(v 2 2 , [pT ]) as a function of beam-energy and event-shape, could aid precision extraction of the temperature and baryon chemical-potential dependence of η/s from the wealth of Au+Au data obtained in the RHIC beam energy scan.

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“…Observables that characterize the azimuthal anisotropy of particles emitted in the transverse plane, are among the key measurements that have been used to constrain the viscous hydrodynamic response to the initial spatial distribution in energy density, produced in the early stages of the collision [5,[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Model investigations of the correlation between the mean transverse momentum and anisotropic flow in shape-engineered events

Magdy,

Lacey

2021

Preprint

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The correlation between the event mean-transverse momentum, [pT], and the anisotropic flow magnitude, vn, ρ(v 2 n , [pT ]), has been argued to be sensitive to the initial conditions in heavy-ion collisions. We use simulated events generated with the AMPT and EPOS models, to investigate the model dependence, and the response and sensitivity of the ρ(v 2 2 , [pT ]) correlator to collisionsystem size and shape, and the viscosity of the matter produced in the collisions. We find good qualitative agreement between the correlators for the string melting version of the AMPT model and the EPOS model. Detailed tests indicate that ρ(v 2 2 , [pT ]) is sensitive to the initial-state geometry of the collision system, but is insensitive to sizable changes in the viscosity of the medium produced in the collisions. These findings suggest that precise differential measurements of ρ(v 2 2 , [pT ]) as a function of system-size, shape and beam-energy could provide more stringent constraints to discern between initial-state models and hence, more reliable extractions of η/s.

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Investigation of the Elliptic Flow Fluctuations of the Identified Particles Using the a Multi-Phase Transport Model

Cited by 19 publications

References 71 publications

Azimuthal dependence of two-particle transverse momentum current correlations

Azimuthal dependence of two-particle transverse momentum current correlations

Model study of the energy dependence of the correlation between anisotropic flow and the mean transverse momentum in Au+Au collisions

Model investigations of the correlation between the mean transverse momentum and anisotropic flow in shape-engineered events

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