Anisotropy Scaling Functions in Heavy-Ion Collisions: Insights into the `Ultra-Central Flow Puzzle' and Constraints on Transport Coefficients and Nuclear Deformation
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arXiv
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866912030862082048 |
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| author | Lacey, Roy A. |
| author_facet | Lacey, Roy A. |
| contents | 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, Xe+Xe collisions at 5.44 TeV and Au+Au collisions at 0.2 TeV, 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 (\(δ_f\)), the medium's stopping power (\(\Hat{q}\)), and specific shear viscosity (\(η/s\)) on the observed anisotropies. This analysis not only enhances understanding of transport coefficients but also provides crucial constraints on nuclear deformation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_09389 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Anisotropy Scaling Functions in Heavy-Ion Collisions: Insights into the `Ultra-Central Flow Puzzle' and Constraints on Transport Coefficients and Nuclear Deformation Lacey, Roy A. Nuclear Experiment High Energy Physics - Experiment Nuclear Theory 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, Xe+Xe collisions at 5.44 TeV and Au+Au collisions at 0.2 TeV, 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 (\(δ_f\)), the medium's stopping power (\(\Hat{q}\)), and specific shear viscosity (\(η/s\)) on the observed anisotropies. This analysis not only enhances understanding of transport coefficients but also provides crucial constraints on nuclear deformation. |
| title | Anisotropy Scaling Functions in Heavy-Ion Collisions: Insights into the `Ultra-Central Flow Puzzle' and Constraints on Transport Coefficients and Nuclear Deformation |
| topic | Nuclear Experiment High Energy Physics - Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2402.09389 |