"Table 10" of "Measurement of the cross section and longitudinal double-spin asymmetry for di-jet production in polarized $pp$ collisions at $\sqrt{s}$ = 200 GeV"

BNL-RHIC. We report the first measurement of the longitudinal double-spin asymmetry $A_{LL}$ for mid-rapidity di-jet production in polarized $pp$ collisions at a center-of-mass energy of $\sqrt{s} = 200$ GeV. The di-jet cross section was measured and is shown to be consistent with next-to-leading order (NLO) perturbative QCD predictions. $A_{LL}$ results are presented for two distinct topologies, defined by the jet pseudorapidities, and are compared to predictions from several recent NLO global analyses. The measured asymmetries, the first such correlation measurements, support those analyses that find positive gluon polarization at the level of roughly 0.2 over the region of Bjorken-$x > 0.05$.

BNL-RHIC（布鲁克海文国家实验室-相对论重离子对撞机）：本工作首次测量了质心系能量√s=200 GeV的极化质子-质子碰撞中，中快度双喷注产生过程的纵向双自旋不对称度$A_{LL}$。研究团队同步测量了双喷注截面，结果与次领头阶（next-to-leading order, NLO）微扰量子色动力学（perturbative QCD）的理论预言相符。针对由喷注赝快度定义的两种不同拓扑结构，本文给出了$A_{LL}$的测量结果，并与近期多项NLO整体分析的理论预言进行了对比。本次测量的不对称度作为此类关联测量的首例结果，支持了那些在比约肯-$x$（Bjorken-$x$）>0.05的区域内得到约0.2量级正胶子极化的分析工作。