无自旋靶光子轻产生的精细分析
Refined analysis of photon leptoproduction off spinless target
摘要：
利用广义部分子分布的概念，计算了作为强子结构主要探针的无自旋强子的实光子电产生微分截面。与以前可用的计算与扭曲三次幂的精度相比，我们完全占强子质量和动量转移所产生的轻子螺旋度振幅的所有运动学效应。我们对这些运动学效应进行了数值研究，结果表明，在价夸克区域和设置因子分解尺度的硬光子的较低虚拟度中，与精确公式相比，现有的近似结果显着高估了截面率。
英文摘要：
We calculate the differential cross section for real photon electroproduction off spinless hadron which sevres as a main probe of the hadrons structure via the concept of generalized parton distributions. Compared to previously available computations performed with twist-three power accuracy, we exactly accounted for all kinematical effects in hadron mass and momentum transfer which arise from leptonic helicity amplitudes. We performed numerical studies of these kinematical effects and demonstrated that in the valence quark region and rather low virtualities of the hard photon which sets the factorization scale, the available approximate results significantly overestimate the cross section rates in comparison to exact formulas.
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