Directed Flow in Microscopic Models in Relativistic A+A Collisions

Bravina, L.; Kvasiuk, Yurii; Sivoklokov, S. Yu.; Vitiuk, O. V.; Zabrodin, E.

doi:10.3390/universe5030069

Cited by 6 publications

(4 citation statements)

References 26 publications

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“…Experimentally, it is found that K + shows anti-flow and K − shows normal flow as nucleons due to different potentials they experience while propagating through medium derived from the effective chiral models [60]. But on the other hand, such behaviour is in agreement with the UrQMD results published recently [61]. The authors have studied the influence of the inclusion of mean-field potentials on the directed flow of hadrons.…”

Section: Rapidity Dependencesupporting

confidence: 67%

Anisotropic flow of charged and identified hadrons at FAIR energies and its dependence on the nuclear equation of state

2019

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In this article, we examine the equation of state (EoS) dependence of the anisotropic flow parameters (v1, v2 and v4) of charged and identified hadrons, as a function of transverse momentum (pT), rapidity (yc.m.) and the incident beam energy (E Lab ) in mid-central Au + Au collisions in the energy range E Lab = 6 − 25 A GeV. Simulations are carried out by employing different variants of the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model, namely the pure transport (cascade) mode and the hybrid mode. In the hybrid mode, transport calculations are coupled with the ideal hydrodynamical evolution. Within the hydrodynamic scenario, two different equations of state (EoS) viz. Hadron gas and Chiral + deconfinement EoS have been employed separately to possibly mimic the hadronic and partonic scenarios, respectively. It is observed that the flow parameters are sensitive to the onset of hydrodynamic expansion of the fireball in comparison to the pure transport approach. The results would be useful as predictions for the upcoming low energy experiments at Facility for Antiproton and Ion Research (FAIR) and Nuclotron-based Ion Collider fAcility (NICA).

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Section: Rapidity Dependencesupporting

confidence: 67%

Anisotropic flow of charged and identified hadrons at FAIR energies and its dependence on the nuclear equation of state

2019

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“…It was shown earlier that EoS in UrQMD influences kinematic observables, such as directed flow, v 1 , quite significantly [28]. Recall, that directed flow [29] Figure 1.…”

Section: Example: Directed Flowmentioning

confidence: 77%

“…Slope of directed flow of protons coming from UrQMD minimum bias Au+Au collisions generated with hard (stars) and soft (crosses) EoS, respectively. Data are taken from [28].…”

Section: Example: Directed Flowmentioning

confidence: 99%

Classification of equation of state in relativistic heavy-ion collisions using deep learning

Kvasiuk

Zabrodin

Bravina

et al. 2020

J. High Energ. Phys.

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Convolutional Neural Nets, which is a powerful method of Deep Learning, is applied to classify equation of state of heavy-ion collision event generated within the UrQMD model. Event-by-event transverse momentum and azimuthal angle distributions of protons are used to train a classifier. An overall accuracy of classification of 98% is reached for Au+Au events at √ s N N = 11 GeV. Performance of classifiers, trained on events at different colliding energies, is investigated. Obtained results indicate extensive possibilities of application of Deep Learning methods to other problems in physics of heavyion collisions.

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“…1 but for the directed flow of charged pions. [19]. We consider directed flow of protons, v p 1 (y), first.…”

Section: Resultsmentioning

confidence: 99%

Directed flow and freeze-out in relativistic heavy-ion collisions at NICA and FAIR energies

Bravina¹,

Kvasiuk²,

Sachenko³

et al. 2019

Proceedings of Corfu Summer Institute 2018 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2018)

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Directed flow of charged particles is studied in nucleus-nucleus collisions simulated within the energy range accessible for NICA and FAIR facilities. Two transport cascade models, UrQMD and QGSM, are employed. These models use different mechanisms of the string excitation and string fragmentation. Despite of the differences, directed flows of charged pions and charged kaons in both models remain antiflow-oriented with reduction of the collision energy from √ s = 11.5 GeV to 3.5 GeV. In contrast, the directed flow of protons changes its sign from antiflow to normal flow within the investigated energy interval. Both models favor continuous non-uniform emittence of hadrons from the expanding fireball rather than sharp, or sudden, freeze-out picture adopted by majority of hydrodynamic models. We found that the earlier frozen hadrons carry the strongest directed flow at midrapidity, although the flow development even at |y| ≤ 0.5 takes about 8-12 fm/c for different hadron species.

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Directed Flow in Microscopic Models in Relativistic A+A Collisions

Cited by 6 publications

References 26 publications

Anisotropic flow of charged and identified hadrons at FAIR energies and its dependence on the nuclear equation of state

Anisotropic flow of charged and identified hadrons at FAIR energies and its dependence on the nuclear equation of state

Classification of equation of state in relativistic heavy-ion collisions using deep learning

Directed flow and freeze-out in relativistic heavy-ion collisions at NICA and FAIR energies

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