Beam-Energy Dependence of the Directed Flow of Deuterons in Au+Au Collisions

STAR Collaboration,; Adam, J.; Schmitz, N.; Seyboth, P.; et al.,

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Beam-Energy Dependence of the Directed Flow of Deuterons in Au+Au Collisions

MPS-Authors

STAR Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Adam, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schmitz, N.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Seyboth, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

et al.,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

STAR Collaboration, Adam, J., Schmitz, N., Seyboth, P., & et al. (2020). Beam-Energy Dependence of the Directed Flow of Deuterons in Au+Au Collisions. Physical Review C, 102, 044906. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2020-279.

Cite as: https://hdl.handle.net/21.11116/0000-0008-1AF1-B

Abstract

We present a measurement of the first-order azimuthal anisotropy, v_1(y), of deuterons from Au+Au collisions at sqrt{s_NN} = 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 v_1(y) slope, dv_{1}/dy|_{y=0}, for deuterons, where y is the rapidity, is extracted for semi-central collisions (10-40\% centrality) and compared to that of protons. While the v_1(y) slopes of protons are generally negative for sqrt{s_NN} > 10 GeV, those for deuterons are consistent with zero, a strong enhancement of the v_1(y) slope of deuterons is seen at the lowest collision energy (the largest baryon density) at sqrt{s_NN} =$ 7.7 GeV. In addition, we report the transverse momentum dependence of v_1 for protons and deuterons. The experimental results are compared with transport and coalescence models.