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

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

STAR

Collaboration

Apr 23, 2018

7 pages

Published in:

Phys.Lett.B 784 (2018) 26-32

Published: Sep 10, 2018

e-Print:

1804.08647 [nucl-ex]

DOI:

10.1016/j.physletb.2018.07.013 (publication)

Experiments:

BNL-RHIC-STAR

View in:

ADS Abstract Service

reference search13 citations

Citations per year

Abstract: (Elsevier)

New measurements of directed flow for charged hadrons, characterized by the Fourier coefficient v1 , are presented for transverse momenta pT , and centrality intervals in Au+Au collisions recorded by the STAR experiment for the center-of-mass energy range sNN=7.7–200 GeV. The measurements underscore the importance of momentum conservation, and the characteristic dependencies on sNN , centrality and pT 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 pT dependencies of v1even , as well as an observed similarity between its excitation function and that for v3 , could serve as constraints for initial-state models. The v1even 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.

Note:

8 pages, four figures, submitted for publication

momentum: conservation law
fluctuation: geometrical
heavy ion: scattering
flow
excited state
temperature dependence
transverse momentum dependence
energy dependence
initial state
viscosity

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