First order event plane correlated directed and triangular flow in Au+Au collisions from BES-II at STAR.

In heavy-ion collisions, the measurements of anisotropic flow coefficients (vn) offer insights into collective hydrodynamic expansion and transport properties of the produced medium at higher collision energies, while also being sensitive to the compressibility of the nuclear matter and nuclear equation of state at lower collision energies. In this contribution, we present the measurement of charged particle v1 over ten units of pseudorapidity (η) in Au+Au collisions at √SNN = 27 and 19.6 GeV and compare it with multiple model calculations. Only UrQMD was able to reproduce a sizable v1 at the forward pseudorapidity as observed in the experiment. We also present the results of v1 and v3 at √SNN = 3 - 3.9 GeV for identified hadrons and light nuclei with respect to Ψ1. The results are compared with theoretical models to identify the source of nonzero v3{Ψ1} and to demonstrate its vital connection to the equation of state. [ABSTRACT FROM AUTHOR]