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

Magdy, Niseem; Lacey, R.

doi:10.1016/j.physletb.2021.136625

Cited by 13 publications

(8 citation statements)

References 61 publications

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“…Figure 2 reports as well on results from a low-viscosity run where we set ζ/s = 0 and η/s = 0.02 (and appropriately rescale the initial profiles to account for the loss of vis-cous entropy production). The result confirms that ρ n are driven by initial-state fluctuations, and are largely insensitive to medium effects (see also [29]). Their inclusion in future Bayesian analyses will provide a more focused sensitivity to initial-state properties, leading in particular to improved estimates of w (or w q ).…”

Section: Pearson Correlation Coefficient Introduced By Bożek [18]supporting

confidence: 77%

Constraining the nucleon size with relativistic nuclear collisions

Giacalone,

Schenke,

Shen

2021

Preprint

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The notion of the "size" of nucleons and their constituents plays a pivotal role in the current paradigm of the formation and the fluctuations of the quark-gluon plasma produced in high-energy nuclear collision experiments. We report on state-of-the-art hydrodynamic results showing that the correlation between anisotropic flow, v 2 n , and the mean transverse momentum of hadrons, [pt], possesses a unique sensitivity to the nucleon size in off-central heavy-ion collisions. We argue that existing experimental measurements of this observable support a picture where the relevant length scale characterizing the colliding nucleons is of order 0.5 fm or smaller, and we discuss the broad implications of this finding for future global Bayesian analyses aimed at extracting initialstate and medium properties from nucleus-nucleus collision data, including v 2 n -[pt] correlations. Determinations of the nucleon size in heavy-ion collisions will provide a solid independent constraint on the initial state of small system collisions, and will establish a deep connection between collective flow data in nucleus-nucleus experiments and data on deep inelastic scattering on protons and nuclei.

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Section: Pearson Correlation Coefficient Introduced By Bożek [18]supporting

confidence: 77%

Constraining the nucleon size with relativistic nuclear collisions

Giacalone,

Schenke,

Shen

2021

Preprint

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“…The latter selection mimics the acceptance of the STAR experiment at RHIC. The new results obtained with the hybrid model are also compared to those obtained in our earlier work [31] which used the AMPT [43], and EPOS [44][45][46] models. Table I gives a summary of the models used and their associated parameters.…”

Section: A Modelsmentioning

confidence: 92%

“…Such estimates have not been fully charted quantitatively. Recently, several works have sought to study the correlation coefficient ρ(v 2 n , [p T ]) because it indicates different sensitivities to the initial-and final-states of the collisions [23][24][25][26][27][28][29][30][31] that could provide more stringent constraints for η/s (T, µ B ). The correlation coefficient…”

Section: Introductionmentioning

confidence: 99%

“…The correlation coefficient has also been investigated in hydrodynamic and transport models [26,28,29,31,37,38]. However, a detailed mapping of its beam energy dependence is still lacking.…”

Section: Introductionmentioning

confidence: 99%

“…Here, we use simulated events from a hybrid model [39] that employs the hadron-string transport model UrQMD and the (3+1)D relativistic viscous hydrodynamic code vHLLE, to chart the beam-energy and evenshape dependence of ρ(v [31].…”

Section: Introductionmentioning

confidence: 99%

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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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