论文标题
重型离子碰撞中向量介子的旋转对准
Spin alignment of vector mesons in heavy-ion collisions
论文作者
论文摘要
高能重型离子碰撞中的极化夸克和古夸克会导致夸克结合形成的载体介子的自旋比对。 Using the relativistic spin Boltzmann equation for vector mesons derived from Kadanoff-Baym equations with an effective quark-meson model for strong interaction and quark coalescence model for hadronizaton, we calculate the spin density matrix element $ρ_{00}$ for $ϕ$ mesons and show that anisotropies of local field correlations or fluctuations with respect to the spin quantization direction lead到$ ϕ $梅森的旋转对齐。我们建议，$ ϕ $ fields的局部相关性或波动是观察到的$ ϕ $ Meson的自旋对齐的主要机制，并且可以从实验数据中提取作为碰撞能量的函数。 $ρ_{00} $的计算出的横向动量依赖性与Star的数据一致。我们进一步预测$ρ_{00} $的方位角依赖性，可以在将来的实验中测试。
Polarized quarks and antiquarks in high-energy heavy-ion collisions can lead to the spin alignment of vector mesons formed by quark coalescence. Using the relativistic spin Boltzmann equation for vector mesons derived from Kadanoff-Baym equations with an effective quark-meson model for strong interaction and quark coalescence model for hadronizaton, we calculate the spin density matrix element $ρ_{00}$ for $ϕ$ mesons and show that anisotropies of local field correlations or fluctuations with respect to the spin quantization direction lead to $ϕ$ meson's spin alignment. We propose that the local correlation or fluctuation of $ϕ$ fields is the dominant mechanism for the observed the $ϕ$ meson's spin alignment and its strength can be extracted from experimental data as functions of collision energies. The calculated transverse momentum dependence of $ρ_{00}$ agrees with STAR's data. We further predict the azimuthal angle dependence of $ρ_{00}$ which can be tested in future experiments.
