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

Abstract

We report here the first observation of directed flow ($v_1$) of the hypernuclei ${}_{\Lambda }^3$H and ${}_{\Lambda }^4$H in mid-central Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 3 GeV at RHIC. These data are taken as part of the beam energy scan program carried out by the STAR experiment. From 165 $\times$ 10${}^6$ events in 5%-40% centrality, about 8400 ${}_{\Lambda }^3$H and 5200 ${}_{\Lambda }^4$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 midrapidity $v_1$ slopes of ${}_{\Lambda }^3$H and ${}_{\Lambda }^4$H follow baryon number scaling, implying that the coalescence is the dominant mechanism for these hypernuclei production in such collisions.

arXiv comment5pages, 4 figures. Supplemental material: 6 pages, 5 figures

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