Beam energy dependence of rapidity-even dipolar flow in Au plus Au collisions



Adam, J, Adamczyk, L, Adams, JR, Adkins, JK, Agakishiev, G, Aggarwal, MM, Ahammed, Z, Ajitanand, NN, Alekseev, I, Anderson, DM
et al (show 339 more authors) (2018) Beam energy dependence of rapidity-even dipolar flow in Au plus Au collisions. PHYSICS LETTERS B, 784. pp. 26-32.

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Abstract

New measurements of directed flow for charged hadrons, characterized by the Fourier coefficient \vone, are presented for transverse momenta $\mathrm{p_T}$, and centrality intervals in Au+Au collisions recorded by the STAR experiment for the center-of-mass energy range $\mathrm{\sqrt{s_{_{NN}}}} = 7.7 - 200$ GeV. The measurements underscore the importance of momentum conservation and the characteristic dependencies on $\mathrm{\sqrt{s_{_{NN}}}}$, centrality and $\mathrm{p_T}$ are consistent with the expectations of geometric fluctuations generated in the initial stages of the collision, acting in concert with a hydrodynamic-like expansion. The centrality and $\mathrm{p_T}$ dependencies of $\mathrm{v^{even}_{1}}$, as well as an observed similarity between its excitation function and that for $\mathrm{v_3}$, could serve as constraints for initial-state models. The $\mathrm{v^{even}_{1}}$ excitation function could also provide an important supplement to the flow measurements employed for precision extraction of the temperature dependence of the specific shear viscosity.

Item Type: Article
Additional Information: 8 pages, four figures, submitted for publication
Uncontrolled Keywords: nucl-ex, nucl-ex
Depositing User: Symplectic Admin
Date Deposited: 30 Apr 2019 09:47
Last Modified: 19 Jan 2023 00:52
DOI: 10.1016/j.physletb.2018.07.013
Open Access URL: https://doi.org/10.1016/j.physletb.2018.07.013
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3039033