论文标题
部分可观测时空混沌系统的无模型预测
Flow and transverse momentum correlation in Pb+Pb and Xe+Xe collisions with ATLAS: assessing the initial condition of the QGP
论文作者
论文摘要
在我们领域的一个重要挑战是了解QGP的初始状况，并使用敏感的实验可观察力来限制其。最近的研究表明，皮尔逊相关系数之间的$ {\ bm v} _n $与事件的平均横向动量$ [p _ {\ mathrm {t}}] $，$ρ_{n}（{\ bm v} _n，体积波动和重型离子碰撞初始状态下的初始动量各向异性。此程序介绍了$ {\ bm V} _n-的新的精确测量，[p _ {\ Mathrm {t}}] $ cloreation $^{\ Mathrm {\ Mathrm {129}}}} \ Mathrm {xe} $^{\ MATHRM {208}} \ MATHRM {PB}+^{\ MATHRM {208}} \ MATHRM {pb} $谐波$ n = 2 $，3和4使用ATLAS detector在LHC上使用Atlas detcter。 $ρ_{n} $的值显示了对中心性的丰富和非单调依赖性，$ p_ {t} $和$η$，反映出初始状态的不同成分影响了相位空间的不同区域。超中央区域的两个系统之间的$ρ_{2} $的比率表明，$ {^\ mathrm {129}}} \ Mathrm {Xe} $具有较大的四倍变形，并且具有重要的三方。所有当前模型都无法描述数据中观察到的许多趋势。
One important challenge in our field is to understand the initial condition of the QGP and constrain it using sensitive experimental observables. Recent studies show that the Pearson Correlation Coefficient between ${\bm V}_n$ and event-wise mean transverse momentum $[p_{\mathrm{T}}]$, $ρ_{n}({\bm V}_n,[p_{\mathrm{T}}])$ can probe number and size of sources, nuclear deformation, volume fluctuation, and initial momentum anisotropy in initial state of heavy-ion collisions. This proceeding presents new, precision measurements of ${\bm V}_n-[p_{\mathrm{T}}]$ correlation in $^{\mathrm{129}}\mathrm{Xe}+^{\mathrm{129}}\mathrm{Xe}$ and $^{\mathrm{208}}\mathrm{Pb}+^{\mathrm{208}}\mathrm{Pb}$ collisions for harmonics $n=2$, 3, and 4 using the ATLAS detector at the LHC. The values of $ρ_{n}$ shows rich and non-monotonic dependence on centrality, $p_{T}$ and $η$, reflecting that different ingredients of the initial state impact different regions of the phase space. The ratio of $ρ_{2}$ between the two systems in the ultra-central region suggests that ${^\mathrm{129}}\mathrm{Xe}$ has large quadrupole deformation and with a significant triaxiality. All current models fail to describe many of the observed trends in the data.
