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Abstract <p>In this overview, the recent results on direct-photon production and correlations in Pb–Pb collisions at <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3638_Article_IEq3.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="100" /> </InlineMediaObject> <EquationSource Format="TEX">\(\sqrt{s_{NN}}=5.02\)</EquationSource> <!--NuclPhys2560128Kuskov-m3--> </InlineEquation> TeV obtained by the ALICE collaboration are presented. The invariant yields of direct photons have been measured in a wide range of transverse momentum (<InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3638_Article_IEq4.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="20" /> </InlineMediaObject> <EquationSource Format="TEX">\(p_{T}\)</EquationSource> <!--NuclPhys2560128Kuskov-m4--> </InlineEquation>) from 0.4 to 16 GeV/<InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3638_Article_IEq5.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="11" /> </InlineMediaObject> <EquationSource Format="TEX">\(c\)</EquationSource> <!--NuclPhys2560128Kuskov-m5--> </InlineEquation> in different centrality classes from central to peripheral collisions. Obtained spectra are consistent with perturbative Quantum Chromodynamics (pQCD) calculations and hydrodynamic predictions. Promising measurements of direct-photon correlations have been performed, resulting in estimation of the correlation radii of the emitting source in central and semicentral collisions. In addition, two-photon correlations are used to extend the <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3638_Article_IEq4.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="20" /> </InlineMediaObject> <EquationSource Format="TEX">\(p_{T}\)</EquationSource> <!--NuclPhys2560128Kuskov-m6--> </InlineEquation>-dependent invariant yields of direct photons down to 250 MeV/<InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11450_2025_3638_Article_IEq5.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="11" /> </InlineMediaObject> <EquationSource Format="TEX">\(c\)</EquationSource> <!--NuclPhys2560128Kuskov-m7--> </InlineEquation>.</p>

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Direct-Photon Production and Correlations in Pb–Pb Collisions at \({\sqrt{s_{NN}}=5.02}\) TeV

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Vladislav Kuskov

摘要

Abstract

In this overview, the recent results on direct-photon production and correlations in Pb–Pb collisions at \(\sqrt{s_{NN}}=5.02\) TeV obtained by the ALICE collaboration are presented. The invariant yields of direct photons have been measured in a wide range of transverse momentum ( \(p_{T}\) ) from 0.4 to 16 GeV/ \(c\) in different centrality classes from central to peripheral collisions. Obtained spectra are consistent with perturbative Quantum Chromodynamics (pQCD) calculations and hydrodynamic predictions. Promising measurements of direct-photon correlations have been performed, resulting in estimation of the correlation radii of the emitting source in central and semicentral collisions. In addition, two-photon correlations are used to extend the \(p_{T}\) -dependent invariant yields of direct photons down to 250 MeV/ \(c\) .