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arXiv · 2506.07941

Model Comparisons of Transverse Energy and Charged-Particle Multiplicity in A+A Collisions at Midrapidity from $\sqrt{s_{NN}}$ $=$ 7.7 to 200~GeV

Niseem Magdy·Antonio Silva·Christal Martin·Josie Hakanson·Olivia Bartoshesky·Aidan Hill·Christine Nattrass
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Abstract

We present a comprehensive comparison of PHENIX measurements of transverse energy production ($dE_T/d\eta$) and charged-particle multiplicity ($dN/d\eta$) at midrapidity to simulations from PYTHIA-8, AMPT, HIJING, and SMASH. These comparisons span both small systems (d+Au, $^3$He+Au) and large systems (Cu+Cu, Cu+Au, Au+Au, and U+U) at $\sqrt{s_{NN}}$ $\sim$ 200~GeV and Au+Au over a range of beam energies $\sqrt{s_{NN}} = 7.7$--200~GeV. Using the Rivet framework, we assess the performance of these models. While general trends are captured, significant deviations persist, particularly in low-energy and peripheral collisions, underscoring the need for improved modeling of baryon stopping and energy deposition mechanisms.

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Niseem Magdy, Antonio Silva, Christal Martin, Josie Hakanson, Olivia Bartoshesky, Aidan Hill, Christine Nattrass. 2025-06-09. Model Comparisons of Transverse Energy and Charged-Particle Multiplicity in A+A Collisions at Midrapidity from $\sqrt{s_{NN}}$ $=$ 7.7 to 200~GeV. https://arxiv.org/abs/2506.07941

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