We report on the measurements of directed flow $v_1$ and elliptic flow $v_2$for hadrons ($\pi^{\pm}$, $K^{\pm}$, $K_{S}^0$, $p$, $\phi$, $\Lambda$ and$\Xi^{-}$) from Au+Au collisions at $\sqrt{s_{NN}}$ = 3\,GeV and $v_{2}$ for($\pi^{\pm}$, $K^{\pm}$, $p$ and $\overline{p}$) at 27 and 54.4\,GeV with theSTAR experiment. While at the two higher energy midcentral collisions thenumber-of-constituent-quark (NCQ) scaling holds, at 3\,GeV the $v_{2}$ atmidrapidity is negative for all hadrons and the NCQ scaling is absent. Inaddition, the $v_1$ slopes at midrapidity for almost all observed hadrons arefound to be positive, implying dominant repulsive baryonic interactions. Thefeatures of negative $v_2$ and positive $v_1$ slope at 3\,GeV can be reproducedwith a baryonic mean-field in transport model calculations. These results implythat the medium in such collisions is likely characterized by baryonicinteractions.

Disappearance of partonic collectivity in sqrt{s_{NN}} = 3 GeV Au+Au collisions at RHIC

S. Fazio;
2022-01-01

Abstract

We report on the measurements of directed flow $v_1$ and elliptic flow $v_2$for hadrons ($\pi^{\pm}$, $K^{\pm}$, $K_{S}^0$, $p$, $\phi$, $\Lambda$ and$\Xi^{-}$) from Au+Au collisions at $\sqrt{s_{NN}}$ = 3\,GeV and $v_{2}$ for($\pi^{\pm}$, $K^{\pm}$, $p$ and $\overline{p}$) at 27 and 54.4\,GeV with theSTAR experiment. While at the two higher energy midcentral collisions thenumber-of-constituent-quark (NCQ) scaling holds, at 3\,GeV the $v_{2}$ atmidrapidity is negative for all hadrons and the NCQ scaling is absent. Inaddition, the $v_1$ slopes at midrapidity for almost all observed hadrons arefound to be positive, implying dominant repulsive baryonic interactions. Thefeatures of negative $v_2$ and positive $v_1$ slope at 3\,GeV can be reproducedwith a baryonic mean-field in transport model calculations. These results implythat the medium in such collisions is likely characterized by baryonicinteractions.
2022
Nuclear Experiment
Nuclear Experiment
High Energy Physics - Experiment
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/334095
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