Speaker
Description
The measurement of pseudorapidity ($\eta$) dependence of directed flow ($v_{1}$) can provide unique constraints on the three-dimensional initial conditions in heavy-ion collisions. In the year 2018, the Event Plane Detector (EPD, $2.1<|\eta|<5.1$) was installed in STAR and used for the Beam Energy Scan phase-II (BES-II) data taking. The combination of EPD and high statistics BES-II data enables us to extend the $v_{1}$ measurement to the very forward and backward psuedorapidity regions. In this poster, we will discuss the techniques for measuring $v_{1}$ with a scintillator detector like EPD and present results of $v_{1}$ in Au+Au collisions at $\sqrt{s_{NN}}=27 $ GeV. We will also compare the results to different models such as AMPT, UrQMD, and hydrodynamic simulations.
