标题： 通过$ χ_2$定量研究质子的极化胶子含量 显示英文标题

标题： Probing the polarized gluon content of the proton through $ χ_2$ hadroproduction

摘要： 确定胶子在极化质子中携带多少自旋是一个根本性问题，无法通过完全包容的深度非弹性测量来解决。 重夸克的强子产生对强子的胶子含量非常敏感。 我们表明，在极化质子-质子碰撞中的$\chi_2 (3555)$产生是一种很好的候选反应，可用于解决这一具有挑战性的问题。 显示英文摘要

摘要： Determining how much spin is carried by gluon in a polarized proton is a fundamental problem which cannot be resolved by completely inclusive deep inelastic measurements. Hadroproduction of heavy flavors is very sensitive to the gluon content of hadrons. We show that $\chi_2 (3555)$ production in polarized proton-proton collisions is a good candidate reaction to address this challenging question.