First Observation of Directed Flow of Hypernuclei $^3_{\Lambda}$H and $^4_{\Lambda}$H in $\sqrt{s_{\rm NN}}$ = 3 GeV Au+Au Collisions at RHIC

The STAR collaboration
Phys.Rev.Lett. 130 (2023) 212301, 2023.

Abstract (data abstract)
Wereport here the first observation of directed flow ($v_1$) of the hypernuclei $^{3}_{\Lambda}$H and $^{4}_{\Lambda}$H in mid-central Au+Au collisions at $\sqrt{s_{NN}}$ = 3 GeV at RHIC. These data are taken as part of the beam energy scan program carried out by the STAR experiment. From 165 million events in 5-40% centrality, about 8400 $^{3}_{\Lambda}$H and 5200 $^{4}_{\Lambda}$H candidates are reconstructed through two- and three-body decay channels. We observe that these hypernuclei exhibit significant directed flow. Comparing to that of light nuclei, it is found that the mid-rapidity $v_1$ slopes of $^{3}_{\Lambda}$H and $^{4}_{\Lambda}$H follow baryon number scaling, implying that the coalescence is the dominant mechanism for these hypernuclei production in the 3 GeV Au+Au collisions.

  • Fig3 (a) $\Lambda$

    Data from Figure 3

    10.17182/hepdata.136028.v1/t1

    $\Lambda$ hyperon and hypernuclei directed flow $v_1$, shown as a function of rapidity, from the $\sqrt{s_{NN}}$ = 3 GeV 5-40%...

  • Fig3 (b) $^{3}_{\Lambda}$H

    Data from Figure 3

    10.17182/hepdata.136028.v1/t2

    $\Lambda$ hyperon and hypernuclei directed flow $v_1$, shown as a function of rapidity, from the $\sqrt{s_{NN}}$ = 3 GeV 5-40%...

  • Fig3 (c) $^{4}_{\Lambda}$H

    Data from Figure 3

    10.17182/hepdata.136028.v1/t3

    $\Lambda$ hyperon and hypernuclei directed flow $v_1$, shown as a function of rapidity, from the $\sqrt{s_{NN}}$ = 3 GeV 5-40%...

  • Fig4 light nuclei from data

    Data from Figure 4

    10.17182/hepdata.136028.v1/t4

    Mass dependence of the mid-rapidity $v_1$ slope, $dv_1/dy$, for $\Lambda$, $^{3}_{\Lambda}$H and $^{4}_{\Lambda}$H from the $\sqrt{s_{NN}}$ = 3 GeV 5-40%...

  • Fig4 hypernuclei from data

    Data from Figure 4

    10.17182/hepdata.136028.v1/t5

    Mass dependence of the mid-rapidity $v_1$ slope, $dv_1/dy$, for $\Lambda$, $^{3}_{\Lambda}$H and $^{4}_{\Lambda}$H from the $\sqrt{s_{NN}}$ = 3 GeV 5-40%...

  • Fig4 light nuclei from JAM

    Data from Figure 4

    10.17182/hepdata.136028.v1/t6

    Mass dependence of the mid-rapidity $v_1$ slope, $dv_1/dy$, for $\Lambda$, $^{3}_{\Lambda}$H and $^{4}_{\Lambda}$H from the $\sqrt{s_{NN}}$ = 3 GeV 5-40%...

  • Fig4 hypernuclei from JAM

    Data from Figure 4

    10.17182/hepdata.136028.v1/t7

    Mass dependence of the mid-rapidity $v_1$ slope, $dv_1/dy$, for $\Lambda$, $^{3}_{\Lambda}$H and $^{4}_{\Lambda}$H from the $\sqrt{s_{NN}}$ = 3 GeV 5-40%...

  • Fig4 hypernuclei from UrQMD

    Data from Figure 4

    10.17182/hepdata.136028.v1/t8

    Mass dependence of the mid-rapidity $v_1$ slope, $dv_1/dy$, for $\Lambda$, $^{3}_{\Lambda}$H and $^{4}_{\Lambda}$H from the $\sqrt{s_{NN}}$ = 3 GeV 5-40%...

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