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

The STAR 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.

  • fig2

    Data from Figure 2

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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)....

  • fig3 top

    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)...

  • fig3 bottom (p, $\pi^{\pm}$, K+)

    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)...

  • fig3 bottom ($\Lambda$)

    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)...

  • fig3 bottom ($K^-$)

    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)...

  • fig3 bottom ($K_S^0$)

    Data from Figure 3

    10.17182/hepdata.110656.v1/t6

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

  • fig4_a 54GeV p

    Data from Figure 4

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    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_b 54GeV p

    Data from Figure 4

    10.17182/hepdata.110656.v1/t8

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_a 54GeV $\pi$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t9

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_b 54GeV $\pi$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t10

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_a 54GeV $K$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t11

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_b 54GeV $K$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t12

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_a 27GeV $\pi$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t13

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_b 27GeV $\pi$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t14

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_a 27GeV $K$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t15

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_b 27GeV $K$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t16

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_a 27GeV $p$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t17

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_b 27GeV $p$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t18

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_a 3GeV $K$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t19

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_b 3GeV $K$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t20

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_a 3GeV $p$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t21

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_a 3GeV $\pi$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t22

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig4_b 3GeV $\pi$

    Data from Figure 4

    10.17182/hepdata.110656.v1/t23

    $v_2$ scaled by the number of constituent quarks, $v_2/n_q$ , as a function of scaled transverse kinetic energy ($(m_T −...

  • fig5_a $\pi, K, \Lambda$

    Data from Figure 5

    10.17182/hepdata.110656.v1/t24

    Collision energy dependence of (top panel) directed flow slope $dv_1/dy|_{y=0}$ for p, $\Lambda, \pi$(combined from $\pi^{\pm}$), K(combined from $K^{\pm}$ and...

  • fig5_a $p$

    Data from Figure 5

    10.17182/hepdata.110656.v1/t25

    Collision energy dependence of (top panel) directed flow slope $dv_1/dy|_{y=0}$ for p, $\Lambda, \pi$(combined from $\pi^{\pm}$), K(combined from $K^{\pm}$ and...

  • fig5_a $\phi$

    Data from Figure 5

    10.17182/hepdata.110656.v1/t26

    Collision energy dependence of (top panel) directed flow slope $dv_1/dy|_{y=0}$ for p, $\Lambda, \pi$(combined from $\pi^{\pm}$), K(combined from $K^{\pm}$ and...

  • fig5_a $\Xi^{-}$

    Data from Figure 5

    10.17182/hepdata.110656.v1/t27

    Collision energy dependence of (top panel) directed flow slope $dv_1/dy|_{y=0}$ for p, $\Lambda, \pi$(combined from $\pi^{\pm}$), K(combined from $K^{\pm}$ and...

  • fig5_b $p$

    Data from Figure 5

    10.17182/hepdata.110656.v1/t28

    Collision energy dependence of (top panel) directed flow slope $dv_1/dy|_{y=0}$ for p, $\Lambda, \pi$(combined from $\pi^{\pm}$), K(combined from $K^{\pm}$ and...

  • fig5_b $\pi$

    Data from Figure 5

    10.17182/hepdata.110656.v1/t29

    Collision energy dependence of (top panel) directed flow slope $dv_1/dy|_{y=0}$ for p, $\Lambda, \pi$(combined from $\pi^{\pm}$), K(combined from $K^{\pm}$ and...

  • fig5_b $K$

    Data from Figure 5

    10.17182/hepdata.110656.v1/t30

    Collision energy dependence of (top panel) directed flow slope $dv_1/dy|_{y=0}$ for p, $\Lambda, \pi$(combined from $\pi^{\pm}$), K(combined from $K^{\pm}$ and...

  • fig5_b $\Lambda$

    Data from Figure 5

    10.17182/hepdata.110656.v1/t31

    Collision energy dependence of (top panel) directed flow slope $dv_1/dy|_{y=0}$ for p, $\Lambda, \pi$(combined from $\pi^{\pm}$), K(combined from $K^{\pm}$ and...

  • fig5_b Z=1 hadrons FOPI

    Data from Figure 5

    10.17182/hepdata.110656.v1/t32

    Collision energy dependence of (top panel) directed flow slope $dv_1/dy|_{y=0}$ for p, $\Lambda, \pi$(combined from $\pi^{\pm}$), K(combined from $K^{\pm}$ and...

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