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Committee for collaboration of Czech Republic

with Joint Institute for Nuclear Research in Dubna Login
Beam energy dependence of rapidity-even dipolar flow in Au plus Au collisions

Author
Adam J. Creighton University, Omaha
Lednický Richard, promovaný fyzik DrSc. dr. h. c. Institute of physics of the ASCR, JINR Dubna
et al.  STAR collaboration

Year
2018

Scientific journal
Physics Letters B, 784, 26-32

Web


Abstract
New measurements of directed flow for charged hadrons, characterized by the Fourier coefficient v(1), are presented for transverse momenta p(T), and centrality intervals in Au+Au collisions recorded by the STAR experiment for the center-of-mass energy range root s(NN) = 7.7-200 GeV. The measurements underscore the importance of momentum conservation, and the characteristic dependencies on root s(NN), centrality and 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 p(T) dependencies of v(1)(even)W, as well as an observed similarity between its excitation function and that for v(3), could serve as constraints for initial-state models. The v(1)(even) 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. (c) 2018 Published by Elsevier B.V.

Cite article as:
J. Adam, R. Lednický, . et al., "Beam energy dependence of rapidity-even dipolar flow in Au plus Au collisions", Physics Letters B, 784, 26-32 (2018)