Anisotropy scaling functions in heavy-ion collisions: Insights into the ultracentral flow puzzle and constraints on transport coefficients and nuclear deformation

IF 3.1 2区 物理与天体物理 Q1 Physics and Astronomy Physical Review C Pub Date : 2024-09-13 DOI:10.1103/physrevc.110.l031901
Roy A. Lacey
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Abstract

Anisotropy scaling functions derived from comprehensive measurements of transverse momentum- and centrality-dependent anisotropy coefficients v2(pT,cent) and v3(pT,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 ultracentral flow puzzle. These functions integrate diverse measurements into a single curve, clarifying anisotropy attenuation throughout the entire pT and centrality range. They reveal the influence of initial-state eccentricities (ɛn), dimensionless size (R), radial flow, viscous correction to the thermal distribution function (δf), the medium's stopping power (q̂), 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.

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重离子碰撞中的各向异性缩放函数:洞察超中心流难题,制约输运系数和核变形
在 5.02 和 2.76 TeV 的 Pb+Pb 对撞、5.44 TeV 的 Xe+Xe 对撞和 0.2 TeV 的 Au+Au 对撞中,通过对横动量和中心度相关的各向异性系数 v2(pT,cent) 和 v3(pT,cent) 的全面测量,得出了各向异性缩放函数,为超中心流之谜提供了新的见解。这些函数将不同的测量结果整合成一条曲线,澄清了整个 pT 和中心度范围内的各向异性衰减。它们揭示了初始状态偏心率(ɛn)、无量纲大小(R)、径向流动、热分布函数的粘性修正(δf)、介质的停止力(q̂)和特定剪切粘度(η/s)对观测到的各向异性的影响。这一分析不仅加深了对传输系数的理解,还为核变形提供了重要的约束条件。
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来源期刊
Physical Review C
Physical Review C 物理-物理:核物理
CiteScore
5.70
自引率
35.50%
发文量
0
审稿时长
1-2 weeks
期刊介绍: Physical Review C (PRC) is a leading journal in theoretical and experimental nuclear physics, publishing more than two-thirds of the research literature in the field. PRC covers experimental and theoretical results in all aspects of nuclear physics, including: Nucleon-nucleon interaction, few-body systems Nuclear structure Nuclear reactions Relativistic nuclear collisions Hadronic physics and QCD Electroweak interaction, symmetries Nuclear astrophysics
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