One-Loop Corrections of Single Spin Asymmetries in Semi-Inclusive DIS
One-Loop Corrections of Single Spin Asymmetries in Semi-Inclusive DIS
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DOI：
10.1103/physrevd.97.054003
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发表时间：
2017-08
期刊：
影响因子：
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通讯作者：
A. P. Chen;J. P. Ma;G. P. Zhang
中科院分区：
文献类型：
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作者：
A. P. Chen;J. P. Ma;G. P. Zhang
我们研究了半包容DIS中的单圈精度的单自旋不对称性，初始态为横极化强子。在QCD共线因式分解的框架下预言了两个可测自旋观测量。该预测采用微扰系数函数和非微扰函数的卷积形式，即扭转2横度分布、扭转3部分子分布、扭转2和扭转3部分子碎裂函数。这些非微扰函数可以从自旋观测量的测量中提取，并提供有价值的强子内部结构的信息。测量可以在当前的COMPASS和JLab实验以及未来的EIC实验中完成。微扰系数函数是在单回路水平上计算的。在计算手性偶扭转和手性奇扭转算符时存在共线发散。我们发现，所有的共线发散可以正确地减去，使最终结果是有限的。
We study single spin asymmetries at one-loop accuracy in semi-inclusive DIS with a transversely polarized hadron in the initial state. Two measurable spin observables are predicted in the framework of QCD collinear factorization. The prediction takes a form of convolutions of perturbative coefficient functions and nonperturbative functions, which are twist-2 transversity distributions, twist-3 parton distributions, twist-2- and twist-3 parton fragmentation functions. These nonperturbative functions can be extracted from measurements of the spin observables and provide valuable information of the inner structure of hadrons. The measurements can be done in current COMPASS- and JLab experiments and in future experiments of EIC. The perturbative coefficient functions are calculated at one-loop level. There are collinear divergences in the calculation involving chirality-even- and chirality-odd twist operators. We find that all collinear divergences can be correctly subtracted so that the final results are finite.