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arXiv 2108.00461hep-phnucl-th
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矢量介子自旋排列的改进夸克合并模型

Improved quark coalescence model for spin alignments of vector mesons

Xin-Li Sheng

摘要:

利用具有相空间依赖性的自旋密度矩阵,提出了一个改进的矢量介子自旋排列的夸克合并模型。在这个模型中,我们提出了一个理解的矢量介子$ϕ$和$K^{*0}$在静态极限的自旋对齐:$ϕ$介子的$ρ_{00}$从$1/3$的一个大的正偏差可能来自于矢量$ϕ$场的电部分,而$ρ_{00}$的负偏差$K^{*0}$介子可能来自于涡度场的电部分。在低$p_T$区,$K^{*0}$介子的$ρ_{00}$与$p_T^2$成正比,这与实验结果定性一致.

英文摘要:

We propose an improved quark coalescence model for spin alignment of vector mesons by spin density matrix with phase space dependence. Within this model we propose an understanding of spin alignments of vector mesons $ϕ$ and $K^{*0}$ 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 $K^{*0}$ mesons may come from the electric part of vorticity fields. In the low-$p_T$ region, $ρ_{00}$ for $K^{*0}$ mesons is proportional to $p_T^2$, which is qualitatively agree with experimental results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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