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Yale University, New Haven, Connecticut 06520, USA.
Phys Rev Lett. 2006 Dec 22;97(25):252001. doi: 10.1103/PhysRevLett.97.252001. Epub 2006 Dec 18.
We report a measurement of the longitudinal double-spin asymmetry A(LL) and the differential cross section for inclusive midrapidity jet production in polarized proton collisions at square root of s = 200 GeV. The cross section data cover transverse momenta 5 < pT < 50 GeV/c and agree with next-to-leading order perturbative QCD evaluations. The A(LL) data cover 5 < pT < 17 GeV/c and disfavor at 98% C.L. maximal positive gluon polarization in the polarized nucleon.
我们报告了在质心能量平方根(s = 200 GeV)的极化质子碰撞中，对纵向双自旋不对称性(A(LL))以及中快度喷注产生的微分截面的测量。截面数据涵盖横向动量(5 < p_T < 50 GeV/c)，并与次领头阶微扰量子色动力学评估结果相符。(A(LL))数据涵盖(5 < p_T < 17 GeV/c)，并在(98%)的置信水平下不支持极化核子中胶子的最大正极化。
