Speaker
Description
Anisotropic collective flow provides valuable information about the evolution of nuclear matter in the early stages of collisions and is one of the commonly used observables in high-energy heavy ion collisions. The first harmonic coefficient in the Fourier expansion of the
final-state azimuthal anisotropy, relative to the reaction plane, is referred to as directed flow, $v_1$.The $v_1$ slope with respect to the rapidity for net-baryons from the first phase of Beam Energy Scan (BES-I) exhibits a minimum around 10-20 GeV, a feature predicted to be sensitive to the softening of the equation of state
near a first-order phase transition.
In this poster, we will present the rapidity dependence of $p$ , $\bar{p}$ , $\Lambda$ and $\bar{\Lambda}$ $v_1$ in Au + Au collisions at $\sqrt{s_{NN}} = 7.7$, 9.2, 11.5, 14.5, 17.3, and 19.6 GeV using the high statistics data from the Beam Energy Scan Phase II
(BES-II) by STAR.We will compare our measurements with transport model calculations
and discuss the implications for understanding the QCD phase structure.
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | STAR |
