论文标题
媒介介子的相对论旋转动力学
Relativistic spin dynamics for vector mesons
论文作者
论文摘要
我们提出了一种基于封闭式路径形式主义中Kadanoff-Baym方程的向量介体的旋转密度矩阵的相对论理论。该理论将旋转可观察物的计算（例如旋转密度矩阵元素$ρ_{00} $用于向量介子的旋转密度矩阵$ρ_{00} $。在理论中，我们将$ρ_{00} $用于$ ϕ $中的$ρ_{00} $，以分离动量和时空变量的分解形式。我们认为，在较低的能量下，对$ρ_{00} $的主要贡献应来自$ ϕ $ fields，可以用与电磁场相同的方式使奇怪的夸克和反夸克两极化。关键的观察结果是，$ ϕ $梅森波函数之间存在相关性，$ ϕ $ field偏向于奇怪的夸克，并且使奇怪的古quark两极分化。这反映在以下事实中，即$ρ_{00} $的贡献都在田地的正方形中，即使田地在时空中可能会强烈波动。强力场的波动可以从Quarkonium Vector Mesons的$ρ_{00} $中提取，作为指向量子染色体动力学基本特性的链接。
We propose a relativistic theory for spin density matrices of vector mesons based on Kadanoff-Baym equations in the closed-time-path formalism. The theory puts the calculation of spin observables such as the spin density matrix element $ρ_{00}$ for vector mesons on a solid ground. Within the theory we formulate $ρ_{00}$ for $ϕ$ mesons into a factorization form in separation of momentum and space-time variables. We argue that the main contribution to $ρ_{00}$ at lower energies should be from the $ϕ$ fields that can polarize the strange quark and antiquark in the same way as electromagnetic fields. The key observation is that there is correlation inside the $ϕ$ meson wave function between the $ϕ$ field that polarizes the strange quark and that polarizes the strange antiquark. This is reflected by the fact that the contributions to $ρ_{00}$ are all in squares of fields which are nonvanishing even if the fields may strongly fluctuate in space-time. The fluctuation of strong force fields can be extracted from $ρ_{00}$ of quarkonium vector mesons as links to fundamental properties of quantum chromodynamics.
