PoS - Proceedings of Science
Volume 311 - Critical Point and Onset of Deconfinement (CPOD2017) - Plenary Session I
Directed flow in Au+Au collisions from the RHIC Beam Energy Scan at the STAR experiment
S. Singha*  on behalf of the STAR collaboration
Full text: pdf
Pre-published on: January 16, 2018
Published on: January 22, 2018
We report results of $v_1(y)$ and $dv_1/dy$ near mid-rapidity for $\pi^{\pm}$, $K^{\pm}$, $K_s^0$, $p$, $\overline{p}$, $\Lambda$, $\overline{\Lambda}$ and $\phi$ from Beam Energy Scan Au+Au collisions at $\sqrt{s_{NN}} = $7.7 - 200 GeV using the STAR detector at RHIC. The $dv_{1}/dy$ of $\pi^{\pm}$, $K^{\pm}$ and $K_s^0$ mesons remains negative over all beam energies. The $dv_1/dy$ of $p$ and $\Lambda$ baryons shows a sign change around 10 - 15 GeV, while net baryons (net p and net $\Lambda$) indicate a double sign change. The $dv_1/dy$ of $\overline{p}$, $\overline{\Lambda}$ and $\phi$ show a similar trend for $\sqrt{s_{NN}}>$ 14.5 GeV. For the first time, $v_{1}$ measurements are used to test a quark coalescence hypothesis. Many measurements are found to be consistent with the particles being formed via coalescence of constituent quarks. The observed deviations from that consistency offer a new approach for probing the collision process at the quark level
DOI: https://doi.org/10.22323/1.311.0004
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