Revisiting directed flow in relativistic heavy-ion collisions from a multiphase transport model

Guo, Chong-Qiang; Zhang, Chunjian; Xu, Jun

doi:10.1140/epja/i2017-12431-2

Cited by 17 publications

(7 citation statements)

References 52 publications

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“…This could be earlier than the development of elliptic flow. Therefore, v 1 has been considered a sensitive probe of the fireball size and nucleon flow at the initial stage [4,27,[38][39][40][41][42]. There are various sources contributing to the directed flow.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal distribution of initial energy density and directed flow of charged particles in relativistic heavy-ion collisions

Jiang,

Cao,

et al. 2021

Preprint

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We study the origin of the directed flow of charged particles produced in relativistic heavy-ion collisions. Three different initial conditions, Bozėk-Wyskiel, CCNU and Shen-Alzhrani, of energy density distributions are coupled to the (3+1)-dimensional viscous hydrodynamic model CLVisc, and their effects on the development of the anisotropic medium geometry, pressure gradient and radial flow are systematically compared. By comparing to experimental data at both RHIC and LHC, we find that the directed flow provides a unique constraint on the tilt of the initial medium profile in the plane spanned by the impact parameter and space-time rapidity. Within midrapidity, the counter-clockwise tilt is shown to be a crucial source of the positive/negative force by the pressure gradient along the impact parameter (x) direction at backward/forward rapidity, which drives a negative slope of the x component of the medium flow velocity with respect to rapidity, and in the end the same feature of the charged particle directed flow.

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Section: Introductionmentioning

confidence: 99%

Longitudinal distribution of initial energy density and directed flow of charged particles in relativistic heavy-ion collisions

Jiang,

Cao,

et al. 2021

Preprint

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“…where (ρ, λ) and (k ρ , k λ ) are relative coordinates and relative momenta calculated in the rest frame of three-quark system, respectively, and σ b is the size parameter of baryon in the model, more details can be seen in reference [32]. The values of RMS radii, are taken to be R m = 0.61 fm for meson and R b = 0.877 fm for baryon, these size parameters are the same as those used in reference [38] for π + and p, respectively.…”

Section: Dqcm Ampt and Analysis Methodsmentioning

confidence: 99%

Event-by-event mean-p _t fluctuations from the AMPT model with a dynamical quark coalescence mechanism

Xu¹,

Liu²,

Wei³

et al. 2020

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

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The event-by-event fluctuations of the mean transverse momentum (p t) in Au + Au collisions at s NN = 7.7 –200 GeV and Pb + Pb collisions at s NN = 2.76 T e V are analyzed using a multiphase transport model (AMPT) with a dynamical quark coalescence mechanism (DQCM). The analysis shows that at 19.6 GeV there exists a splitting between the relative dynamical mean-p t fluctuation from the DQCM AMPT and from the original AMPT (i.e., AMPT with string melting) at freeze-out. Based on the hadron information obtained at different stages of nuclear collisions from the AMPT model, we show that this splitting first arises from the quark coalescence hadronization process, and then develops during the resonance decay process. The results are compared with measurements from STAR at the relativistic heavy-ion collider (RHIC) and ALICE at the large hadron collider (LHC). The comparison shows that the relative dynamical mean-p t fluctuation for non-peripheral collisions at 200 GeV and 2.76 TeV can be explained by these two coalescence scenarios. After introducing the DQCM into the AMPT model, the results become slightly larger and appeared to be closer to the experimental data for s NN = 7.7 –62.4 GeV. Specially, the relative dynamical mean-p t fluctuation with centrality of 0%–5% can be well reproduced by the DQCM AMPT.

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“…The first-order Fourier coefficient of the azimuthal distribution of particles, known as the rapidity-odd directed flow (v 1 ) [19,20,[27][28][29][30][31][32], is among the most popular observables in analyzing the QGP properties, considering that they are sensitive to the initial size and geometry of the nuclear matter produced in energetic collisions [1,27,[33][34][35][36][37][38][39][40][41][42][43][44]. Within hydrodynamic models, the directed flow observed in heavy-ion experiments can be understood with an expanding fireball from an initial energy density that is asymmetric (tilted or shifted) with respect to the beam axis.…”

Section: Introductionmentioning

confidence: 99%

Directed flow and global polarization in Au+Au collisions across energies covered by the beam energy scan at RHIC

Jiang¹,

Wu²,

Cao³

et al. 2023

Preprint

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We study the directed flow of identified particles in Au+Au collisions at √ sNN = 7.7 to 62.4 GeV. The Glauber model is extended to include both a tilted deformation of the QGP fireball with respect to the longitudinal direction and a non-zero longitudinal flow velocity gradient in the initial state. By combining this improved initial condition with a (3+1)-dimensional viscous hydrodynamic model calculation, we obtain a satisfactory description of the transverse momentum spectra and the rapidity dependent directed flow coefficient of different hadron species. Our calculation indicates the sensitivity of the hadron directed flow, especially its splitting between protons and antiprotons, to both the initial geometry and the initial longitudinal flow velocity. Therefore, the combination of directed flow of different hadrons can provide a tight constraint on the initial condition of nuclear matter created in heavy-ion collisions. The initial condition extracted from the directed flow is further tested with the global polarization of Λ and Λ within the same theoretical framework, where we obtain a reasonable description of these hyperon polarization observed at different collision energies at RHIC.

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Revisiting directed flow in relativistic heavy-ion collisions from a multiphase transport model

Cited by 17 publications

References 52 publications

Longitudinal distribution of initial energy density and directed flow of charged particles in relativistic heavy-ion collisions

Longitudinal distribution of initial energy density and directed flow of charged particles in relativistic heavy-ion collisions

Event-by-event mean-p _t fluctuations from the AMPT model with a dynamical quark coalescence mechanism

Directed flow and global polarization in Au+Au collisions across energies covered by the beam energy scan at RHIC

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Revisiting directed flow in relativistic heavy-ion collisions from a multiphase transport model

Cited by 17 publications

References 52 publications

Longitudinal distribution of initial energy density and directed flow of charged particles in relativistic heavy-ion collisions

Longitudinal distribution of initial energy density and directed flow of charged particles in relativistic heavy-ion collisions

Event-by-event mean-p t fluctuations from the AMPT model with a dynamical quark coalescence mechanism

Directed flow and global polarization in Au+Au collisions across energies covered by the beam energy scan at RHIC

Contact Info

Product

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Event-by-event mean-p _t fluctuations from the AMPT model with a dynamical quark coalescence mechanism