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

Abstract

The pseudorapidity distribution of charged hadrons produced in Au+Au collisions at a center-of-mass energy of $\sqrt{s_{\mathrm{NN}}}=200$ 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 $|\eta |<1.1$ 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.

arXiv comment22 pages total, 6 figures, 4 tables. All figures and tables can be found at https://www.sphenix.bnl.gov/PublicResults/sPH-BULK-2025-01 , data available at https://www.hepdata.net/record/ins2907537

References in corpus (13)

• A Multi-Phase Transport Model for Relativistic Heavy Ion Collisions
• EPOS LHC : test of collective hadronization with LHC data
• Heavy Ion Collisions: The Big Picture, and the Big Questions
• Hadron production in nuclear collisions at RHIC and high density QCD
• Formation of superdense hadronic matter in high energy heavy-ion collisions
• ZPC 1.0.1: a parton cascade for ultrarelativistic heavy ion collisions
• Parton-Based Gribov-Regge Theory
• Gluon saturation and initial conditions for relativistic heavy ion collisions
• The RHIC Zero Degree Calorimeter
• Improved version of the PHOBOS Glauber Monte Carlo
• Constraints from the first LHC data on hadronic event generators for ultra-high energy cosmic-ray physics
• The Dynamics of Particle-Particle Correlations and the Ridge Effect in Proton-Proton Collisions
• Predictions for the sPHENIX physics program