论文标题
恒星线性和模式耦合流量谐波的光束能源和碰撞系统依赖性
Beam-energy and collision-system dependence of the linear and mode-coupled flow harmonics from STAR
论文作者
论文摘要
最新的测量和流体动力模型计算表明，高阶流量系数$ v_ {4} $和$ v_ {5} $具有两种贡献：由初始状态偏心率驱动的线性贡献，$ \ varepsilon_ {n} $，以及从模式的贡献中偏低的依据造成了偏低的依据， $ \ varepsilon_ {2} $和$ \ varepsilon_ {3} $。对$ v_ {4} $和$ v_ {5} $的这两个贡献的测量提供了至关重要的见解，以辨别初始状态模型，并限制在重型离子碰撞中产生的等离子体的温度相关特定的剪切粘度，$η/s $。在这项工作中，我们采用了两种序列累积技术来提供对高阶流量谐波的线性和模式耦合贡献的第一个光束能源和碰撞系统的依赖性。在$ \ mathrm {\ sqrt {s_ {s_ {nn}}} $ = 193 gev，au+au colisrions $ \ mathrm {\ mathrm {\ sqrt {\ sqrt {s_ {s_ {nn} $ = 2004.4 gev和54.4 gev and 54.4 gev和54.4 gev and 54.4 gev and和54.4 gev，我们的结果显示了我们的结果和讨论的几个中心间隔。 $ \ mathrm {\ sqrt {s_ {nn}}} $ = 200 Gev。将结果与LHC的爱丽丝实验进行的类似研究进行了比较。
Recent measurements and hydrodynamic model calculations suggest that the higher-order flow coefficients $v_{4}$ and $v_{5}$ have two contributions: a linear contribution driven by the initial-state eccentricities, $\varepsilon_{n}$, and a mode-coupled contribution derived from the lower-order eccentricity coefficients $\varepsilon_{2}$ and $\varepsilon_{3}$. Measurements of these two contributions to $v_{4}$ and $v_{5}$ provide crucial insights to discern initial-state models and to constrain the temperature-dependent specific shear viscosity, $η/s$, of the plasma produced in heavy-ion collisions. In this work, we have employed the two-subevents cumulant technique to provide the first beam-energy and collision-system dependence of the linear and mode-coupled contributions to the higher-order flow harmonics. Our results are shown and discussed for several centrality intervals for U+U collisions at $\mathrm{\sqrt{s_{NN}}}$= 193 GeV, Au+Au collisions at $\mathrm{\sqrt{s_{NN}}}$=200, and 54.4 GeV and Cu+Au collisions at $\mathrm{\sqrt{s_{NN}}}$=200 GeV. The results are compared with similar studies performed by the ALICE experiment at LHC.
