Beam-energy dependence of the directed flow of deuterons in Au+Au collisions

J. Adam et al. (STAR Collaboration)
Phys. Rev. C 102, 044906 – Published 16 October 2020

Abstract

We present a measurement of the first-order azimuthal anisotropy v1 of deuterons from Au+Au collisions at sNN=7.7, 11.5, 14.5, 19.6, 27, and 39 GeV recorded with the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The energy dependence of the v1(y) slope, dv1/dy|y=0, for deuterons, where y is the rapidity, is extracted for semicentral collisions (10%–40% centrality) and compared with that of protons. While the v1(y) slopes of protons are generally negative for sNN>10GeV, those for deuterons are consistent with zero, a strong enhancement of the v1(y) slope of deuterons is seen at the lowest collision energy (the largest baryon density) at sNN=7.7GeV. In addition, we report the transverse momentum dependence of v1 for protons and deuterons. The experimental results are compared with transport and coalescence models.

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  • Received 9 July 2020
  • Accepted 22 September 2020

DOI:https://doi.org/10.1103/PhysRevC.102.044906

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 102, Iss. 4 — October 2020

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