Abstract
We present a measurement of the first-order azimuthal anisotropy of deuterons from collisions at , 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 slope, , for deuterons, where is the rapidity, is extracted for semicentral collisions (10%–40% centrality) and compared with that of protons. While the slopes of protons are generally negative for , those for deuterons are consistent with zero, a strong enhancement of the slope of deuterons is seen at the lowest collision energy (the largest baryon density) at . In addition, we report the transverse momentum dependence of for protons and deuterons. The experimental results are compared with transport and coalescence models.
- Received 9 July 2020
- Accepted 22 September 2020
DOI:https://doi.org/10.1103/PhysRevC.102.044906
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