论文标题
改进的夸克结合模型，用于旋转对齐和千极化
Improved quark coalescence model for spin alignment and polarization of hadrons
论文作者
论文摘要
我们提出了一个改进的夸克聚结模型，用于通过旋转密度基质和相位空间依赖性通过自旋密度矩阵对载体的自旋比对。旋转密度矩阵是通过Wigner函数定义的。在模型中，我们提出了对矢量中$ $和$ k^{*0} $（包括$ \ bar {k}^{*0} $）的旋转对齐的理解：在静态限制中：$ρ_{00} $的巨大积极偏差来自$ n $ 3的$ 3 $ 3的$ n mays $ a the $ n ugatiation，而$ n courtiation the vector n of the vector vector vector， $ K^{*0} $的$ρ_{00} $可能来自涡度张量字段的电动部分。对于$ k^{*0} $梅森的$ρ_{00} $的否定贡献，与$ρ_{00} $相同的贡献，对于$ρ_{00} $，对于$ ϕ $ ersons而言，这一点不太重要，这一点不太重要，这是由奇怪的质量比左右的质量比例的因素所宽； \ MathBf {p} _ {b}^{2} \ right \ rangle $在$ k^{*0} $的波函数上，$ k^{*0} $至$ ϕ $（$ \ \ m athbf {p} _ {b} $是两个构成夸克的相对动量$ k^{*0} $ d）的相对动量。这些结果应通过对重离子碰撞中的涡度张量场和矢量膜场进行详细且全面的模拟来测试。
We propose an improved quark coalescence model for spin alignment of vector mesons and polarization of baryons by spin density matrix with phase space dependence. The spin density matrix is defined through Wigner functions. Within the model we propose an understanding of spin alignments of vector mesons $ϕ$ and $K^{*0}$ (including $\bar{K}^{*0}$) in the static limit: a large positive deviation of $ρ_{00}$ for $ϕ$ mesons from 1/3 may come from the electric part of the vector $ϕ$ field, while a negative deviation of $ρ_{00}$ for $K^{*0}$ may come from the electric part of vorticity tensor fields. Such a negative contribution to $ρ_{00}$ for $K^{*0}$ mesons, in comparison with the same contribution to $ρ_{00}$ for $ϕ$ mesons which is less important, is amplified by a factor of the mass ratio of strange to light quark times the ratio of $\left\langle \mathbf{p}_{b}^{2}\right\rangle $ on the wave function of $K^{*0}$ to $ϕ$ ($\mathbf{p}_{b}$ is the relative momentum of two constituent quarks of $K^{*0}$ and $ϕ$). These results should be tested by a detailed and comprehensive simulation of vorticity tensor fields and vector meson fields in heavy ion collisions.
