Anisotropic flow in high baryon density region

Collective flow is a powerful tool used to analyze the properties of a medium created during high-energy nuclear collisions. Here, we report a systematic study of the first two Fourier coefficients v 1 and v 2 of the proton and π + from Au+Au collisions in the energy range s NN = 2.11–4.9 GeV within...

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Bibliographic Details
Published in:Nuclear science and techniques 2022-03, Vol.33 (2), p.79-86, Article 21
Main Authors: Lan, Shao-Wei, Shi, Shu-Su
Format: Article
Language:English
Subjects:
Beam Physics
Nuclear Energy
Particle Acceleration and Detection
Particle and Nuclear Physics
Physics
Physics and Astronomy
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Summary:Collective flow is a powerful tool used to analyze the properties of a medium created during high-energy nuclear collisions. Here, we report a systematic study of the first two Fourier coefficients v 1 and v 2 of the proton and π + from Au+Au collisions in the energy range s NN = 2.11–4.9 GeV within the framework of a hadronic transport model (UrQMD). Recent results from the STAR experiment were used to test the model calculations. A mean-field mode with strong repulsive interaction is needed to reproduce the 10–40% data at 3 GeV. This implies that hadronic interactions play an important role in the collective flow development in the high baryon density region. The mean values of the freeze-out time for protons and π + are shifted earlier owing to the additional repulsive interactions. We predict the energy dependence of the mean values of the transverse momentum ⟨ p T ⟩ , v 1 , and v 2 for both protons and π + from the Au+Au collisions.
ISSN:1001-8042
2210-3147
DOI:10.1007/s41365-022-01006-0