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Abstract <p>In non-central heavy-ion collisions emitted particles’ spin can be polarized along the initial global angular momentum due to spin–orbit coupling. Global polarization of hyperons is measured utilizing parity violating weak decay of hyperons and is used to probe the vortical properties of the system. The STAR experiment at RHIC measured the global polarization of <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3639_Article_IEq5.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="13" /> </InlineMediaObject> <EquationSource Format="TEX">\(\Lambda\)</EquationSource> <!--NuclPhys2560123Alpatov-m5--> </InlineEquation> hyperons in Au <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3639_Article_IEq6.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(+\)</EquationSource> <!--NuclPhys2560123Alpatov-m6--> </InlineEquation> Au collisions at <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3639_Article_IEq7.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="117" /> </InlineMediaObject> <EquationSource Format="TEX">\(\sqrt{s_{NN}}=3{-}200\)</EquationSource> <!--NuclPhys2560123Alpatov-m7--> </InlineEquation> GeV, and similar measurements were conducted at the LHC for Pb <InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3639_Article_IEq6.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(+\)</EquationSource> <!--NuclPhys2560123Alpatov-m8--> </InlineEquation> Pb collisions at <InlineEquation ID="IEq9"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3639_Article_IEq9.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="100" /> </InlineMediaObject> <EquationSource Format="TEX">\(\sqrt{s_{NN}}=2.76\)</EquationSource> <!--NuclPhys2560123Alpatov-m9--> </InlineEquation> and 5.02 TeV. Measurement of multistrange hyperons have been only limited to top RHIC energy. In these proceedings, we will report results of <InlineEquation ID="IEq10"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3639_Article_IEq10.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="12" /> </InlineMediaObject> <EquationSource Format="TEX">\(\Xi\)</EquationSource> <!--NuclPhys2560123Alpatov-m10--> </InlineEquation> global polarization for Au <InlineEquation ID="IEq11"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3639_Article_IEq6.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(+\)</EquationSource> <!--NuclPhys2560123Alpatov-m11--> </InlineEquation> Au collisions at <InlineEquation ID="IEq12"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3639_Article_IEq12.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="100" /> </InlineMediaObject> <EquationSource Format="TEX">\(\sqrt{s_{NN}}=14.6\)</EquationSource> <!--NuclPhys2560123Alpatov-m12--> </InlineEquation>, 19.6 and 27 GeV by STAR. The global polarization of <InlineEquation ID="IEq13"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3639_Article_IEq10.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="12" /> </InlineMediaObject> <EquationSource Format="TEX">\(\Xi\)</EquationSource> <!--NuclPhys2560123Alpatov-m13--> </InlineEquation> hyperons exhibits a trend comparable to that of <InlineEquation ID="IEq14"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3639_Article_IEq5.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="13" /> </InlineMediaObject> <EquationSource Format="TEX">\(\Lambda\)</EquationSource> <!--NuclPhys2560123Alpatov-m14--> </InlineEquation> and is consistent with predictions from transport model calculations. This observation reinforces the idea of global nature of hyperon polarization in heavy-ion collisions.</p>

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Centrality, Pseudorapidity, and Transverse Momentum Dependence of the Global Polarization of \({\Xi}\) Hyperons in Beam Energy Scan Au \({+}\) Au Collisions by STAR Experiment

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Egor Alpatov

摘要

Abstract

In non-central heavy-ion collisions emitted particles’ spin can be polarized along the initial global angular momentum due to spin–orbit coupling. Global polarization of hyperons is measured utilizing parity violating weak decay of hyperons and is used to probe the vortical properties of the system. The STAR experiment at RHIC measured the global polarization of \(\Lambda\) hyperons in Au \(+\) Au collisions at \(\sqrt{s_{NN}}=3{-}200\) GeV, and similar measurements were conducted at the LHC for Pb \(+\) Pb collisions at \(\sqrt{s_{NN}}=2.76\) and 5.02 TeV. Measurement of multistrange hyperons have been only limited to top RHIC energy. In these proceedings, we will report results of \(\Xi\) global polarization for Au \(+\) Au collisions at \(\sqrt{s_{NN}}=14.6\) , 19.6 and 27 GeV by STAR. The global polarization of \(\Xi\) hyperons exhibits a trend comparable to that of \(\Lambda\) and is consistent with predictions from transport model calculations. This observation reinforces the idea of global nature of hyperon polarization in heavy-ion collisions.