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Nuclear Experiment
Title: Anisotropy Scaling Functions in Heavy-Ion Collisions: Insights into the `Ultra-Central Flow Puzzle' and Constraints on Transport Coefficients and Nuclear Deformation
(Submitted on 14 Feb 2024 (v1), last revised 2 May 2024 (this version, v2))
Abstract: Anisotropy scaling functions derived from comprehensive measurements of transverse momentum- and centrality-dependent anisotropy coefficients $v_2(p_T,\text{cent})$ and $v_3(p_T,\text{cent})$ in Pb+Pb collisions at 5.02 and 2.76 TeV, and Xe+Xe collisions at 5.44 TeV at the LHC, offer new insights into the `ultra-central flow puzzle'. These functions integrate diverse measurements into a single curve, clarifying anisotropy attenuation throughout the entire $p_T$ and centrality range. They reveal the influence of initial-state eccentricities ($\varepsilon_{n}$), dimensionless size ($\mathbb{R}$), radial flow, viscous correction to the thermal distribution function ($\delta_f$), the medium's stopping power ($\hat{q}$), and specific shear viscosity ($\eta/s$) on the observed anisotropies. This analysis not only enhances understanding of transport coefficients but also provides crucial constraints on nuclear deformation.
Submission history
From: Roy Lacey [view email][v1] Wed, 14 Feb 2024 18:40:03 GMT (186kb,D)
[v2] Thu, 2 May 2024 14:28:52 GMT (186kb,D)
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