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<p>The pseudorapidity distribution of charged hadrons produced in Au+Au collisions at a center-of-mass energy of <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_26934_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="45" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <msqrt> <msub> <mi mathvariant="normal">s</mi> <mi>NN</mi> </msub> </msqrt> </math></EquationSource> <EquationSource Format="TEX">\( \sqrt{{\textrm{s}}_{\textrm{NN}}} \)</EquationSource> </InlineEquation> = 200 GeV is measured using data collected by the sPHENIX detector. Charged hadron yields are extracted by counting cluster pairs in the inner and outer layers of the Intermediate Silicon Tracker, with corrections applied for detector acceptance, reconstruction efficiency, combinatorial pairs, and contributions from secondary decays. The measured distributions cover |<i>η</i>| <i>&lt;</i> 1<i>.</i>1 across various centralities, and the average pseudorapidity density of charged hadrons at mid-rapidity is compared to predictions from Monte Carlo heavy-ion event generators. This result, featuring full azimuthal coverage at mid-rapidity, is consistent with previous experimental measurements at the Relativistic Heavy Ion Collider, thereby supporting the broader sPHENIX physics program.</p>

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Measurement of charged hadron multiplicity in Au+Au collisions at \( \sqrt{{\textrm{s}}_{\textrm{NN}}} \) = 200 GeV with the sPHENIX detector

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  • 发表日期：

    2025年8月12日

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  • C. A. Aidala,
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  • M. Vandenbroucke,
  • J. Vasquez,
  • J. Velkovska,
  • V. Verkest,
  • A. Vijayakumar,
  • X. Wang,
  • Y. Wang,
  • Z. Wang,
  • I. S. Ward,
  • M. Watanabe,
  • J. Webb,
  • A. Wehe,
  • A. Wils,
  • V. Wolfe,
  • C. Woody,
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  • Z. Ye,
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  • X. Yu,
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  • W. A. Zajc,
  • V. Zakharov,
  • J. Zhang,
  • C. Zimmerli

摘要

The pseudorapidity distribution of charged hadrons produced in Au+Au collisions at a center-of-mass energy of s NN \( \sqrt{{\textrm{s}}_{\textrm{NN}}} \) = 200 GeV is measured using data collected by the sPHENIX detector. Charged hadron yields are extracted by counting cluster pairs in the inner and outer layers of the Intermediate Silicon Tracker, with corrections applied for detector acceptance, reconstruction efficiency, combinatorial pairs, and contributions from secondary decays. The measured distributions cover |η| < 1.1 across various centralities, and the average pseudorapidity density of charged hadrons at mid-rapidity is compared to predictions from Monte Carlo heavy-ion event generators. This result, featuring full azimuthal coverage at mid-rapidity, is consistent with previous experimental measurements at the Relativistic Heavy Ion Collider, thereby supporting the broader sPHENIX physics program.