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Open AccessArticle

Directed Flow in Microscopic Models in Relativistic A+A Collisions

1
Department of Physics, University of Oslo, PB 1048 Blindern, N-0316 Oslo, Norway
2
Taras Shevchenko National University of Kyiv, UA-01033 Kyiv, Ukraine
3
Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow RU-119991, Russia
*
Author to whom correspondence should be addressed.
This paper is based on the talk at the 7th International Conference on New Frontiers in Physics (ICNFP 2018), Crete, Greece, 4–12 July 2018.
Universe 2019, 5(3), 69; https://doi.org/10.3390/universe5030069
Received: 24 January 2019 / Revised: 26 February 2019 / Accepted: 28 February 2019 / Published: 5 March 2019
Evolution of directed flow of charged particles produced in relativistic heavy-ion collisions at energies 4 s 19.6 GeV is considered within two microscopic transport models, ultra-relativistic quantum molecular dynamics (UrQMD) and quark-gluon string model (QGSM). In both models, the directed flow of protons changes its sign at midrapidity from antiflow to normal flow with decreasing energy of collisions, whereas the flows of mesons and antiprotons remain antiflow-oriented. For lighter colliding systems, such as Cu+Cu or S+S, changing of the proton directed flow occurs at lower bombarding energies and for more central topologies compared to a heavy Au+Au system. The differences can be explained by dissimilar production zones of different hadrons and by the influence of spectators. Directed flows of most abundant hadronic species at midrapidity are found to be formed within t = 10–12 fm/c after the beginning of nuclear collision. The influence of hard and soft mean-field potentials on the directed flow is also studied. View Full-Text
Keywords: relativistic heavy-ion collisions; microscopic transport models; directed flow; mean-field potentials relativistic heavy-ion collisions; microscopic transport models; directed flow; mean-field potentials
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MDPI and ACS Style

Bravina, L.; Kvasiuk, Y.; Sivoklokov, S.; Vitiuk, O.; Zabrodin, E. Directed Flow in Microscopic Models in Relativistic A+A Collisions. Universe 2019, 5, 69.

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