论文标题
通过同时分析轴向形式和广角康普顿散射数据来确定广义的Parton分布
Determination of generalized parton distributions through a simultaneous analysis of axial form factor and wide-angle Compton scattering data
论文作者
论文摘要
在这项工作中，我们提出了一套新的非极化（$ h $）和两极分化（$ \ widetilde {h} $）广义的parton分布（GPD），这些分布（GPD）已使用同时$χ^2 $分析的核子轴向形式（AFF）和广角康普顿散射（WACS）的实验性数据的分析（newance）均可在次要方面进行订单（WACS）的实验性数据。我们探索了文献中为GPD提供的各种Ansatzes，这些Ansatzes使用前向Parton分布作为输入，并选择最适合我们的分析的Ansatzes。我们的分析中包含的实验数据涵盖了广泛的平方横向动量，即$ 0.025 <-t <6.46 $ GEV $ ^2 $。我们表明，WACS数据显着影响$ \ widetilde {h} $的大$ -t $行为。从AFF和WACS数据的同时分析获得的极化GPD与分别分析AFF和WAC获得的相应数据有很大不同，并且不确定性较小。我们表明，使用我们的GPD获得的理论预测与所分析的AFF和WACS数据非常吻合。最后，我们在非极化和横向极化质子中获得了影响参数依赖性的Parton分布，并将其作为断层扫描图显示。
In this work, we present a new set of unpolarized ($ H $) and polarized ($\widetilde{H}$) generalized parton distributions (GPDs) that have been determined using a simultaneous $ χ^2 $ analysis of the nucleon axial form factor (AFF) and wide-angle Compton scattering (WACS) experimental data at the next-to-leading order (NLO) accuracy in QCD. We explore various Ansatzes presented in the literature for GPDs, which use forward parton distributions as input, and choose the ones most suited to our analysis. The experimental data included in our analysis cover a wide range of the squared transverse momentum, which is $ 0.025 < -t < 6.46 $ GeV$ ^2 $. We show that the WACS data affect significantly the large $-t$ behavior of $\widetilde{H}$. The polarized GPDs obtained from the simultaneous analysis of AFF and WACS data differ considerably from the corresponding ones obtained by analyzing AFF and WACS separately, and have less uncertainties. We show that the theoretical predictions obtained using our GPDs are in good agreement with the analyzed AFF and WACS data for the entire range of $ -t $ studied. Finally, we obtain the impact parameter dependent parton distributions, both in an unpolarized and in a transversely polarized proton, and present them as tomography plots.
