Disappearance of partonic collectivity in sNN=3GeV Au+Au collisions at RHIC

The collaboration
Phys.Lett.B 827 (2022) 137003, 2022.

Abstract (data 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 $\sqrt{s_{NN}}$ = 3GeV and $v_2$ for $(\pi^{\pm}, K^{\pm}$, $p$ and $\bar{p})$ at 27 and 54.4 GeV with the STAR experiment. While at the two higher energy midcentral collisions the number-of-constituent-quark (NCQ) scaling holds, at 3 GeV the $v_{2}$ at midrapidity is negative for all hadrons and the NCQ scaling is absent. In addition, the $v_1$ slopes at midrapidity for almost all observed hadrons are found to be positive, implying dominant repulsive baryonic interactions. The features of negative $v_2$ and positive $v_1$ slope at 3 GeV can be reproduced with a baryonic mean-field in transport model calculations. These results imply that the medium in such collisions is likely characterized by baryonic interactions.

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Event plane resolution as a function of collision centrality from Au+Au collisions at $\sqrt{s_{NN}}$=3 (a), 27 and 54.4 GeV (b)....

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Rapidity($y$) dependence of $v_1$ (top panels) and $v_2$ (bottom panels) of proton and $\Lambda$ baryons (left panels), pions (middle panels)...

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Data from Figure 3

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Rapidity($y$) dependence of $v_1$ (top panels) and $v_2$ (bottom panels) of proton and $\Lambda$ baryons (left panels), pions (middle panels)...

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Rapidity($y$) dependence of $v_1$ (top panels) and $v_2$ (bottom panels) of proton and $\Lambda$ baryons (left panels), pions (middle panels)...

• #### fig3 bottom ($K^-$)

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Rapidity($y$) dependence of $v_1$ (top panels) and $v_2$ (bottom panels) of proton and $\Lambda$ baryons (left panels), pions (middle panels)...

• #### fig3 bottom ($K_S^0$)

Data from Figure 3

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Rapidity($y$) dependence of $v_1$ (top panels) and $v_2$ (bottom panels) of proton and $\Lambda$ baryons (left panels), pions (middle panels)...

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• #### fig4_a 54GeV $\pi$

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• #### fig4_a 27GeV $\pi$

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• #### fig4_a 27GeV $K$

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• #### fig4_a 27GeV $p$

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• #### fig4_a 3GeV $K$

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• #### fig4_a 3GeV $p$

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• #### fig4_b 3GeV $\pi$

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