标题： $χ_{c2} \to ρρ$和$rho$极化在无质量微扰QCD中的研究：如何检验分布幅度 显示英文标题

标题： $χ_{c2} \to ρρ$ and the $rho$ polarization in massless perturbative QCD: how to test the distribution amplitudes

摘要： 我们计算了在无质量微扰QCD框架下，极化$\chi_{c2}$在两体衰变中产生的$\rho$矢量介子的螺旋密度矩阵。 $\chi_{c2}$或者通过夸克-反夸克湮灭或胶子融合，在$p \, \bar p$或$p \, p$相互作用中被单独或非单独产生。 我们的结果表明，根据$\rho$分布振幅的选择不同，存在明显显著的差异，并能够区分不同的提出模型。 显示英文摘要

摘要： We compute the helicity density matrix of $\rho$ vector mesons produced in the two-body decays of polarized $\chi_{c2}$'s in the framework of massless perturbative QCD. The $\chi_{c2}$'s are either exclusively or inclusively produced in $p \, \bar p$ or $p \, p$ interactions, via quark-antiquark annihilation or gluon fusion. Our results show unambiguous significant differences depending on the choice of the $\rho$ distribution amplitudes and allow to discriminate between different proposed models.