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arXiv 2211.09522hep-phhep-ex
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零斜率的广义部分子分布

Generalized parton distributions at zero skewness

Hadi Hashamipour, Muhammad Goharipour, K. Azizi, S. V. Goloskokov

备注：
36 pages, 33 figures, and 6 tables; Accepted for publication in Physical Review D
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AI总结：

通过同时分析电磁形状因子、轴向形状因子及大角度康普顿散射等实验数据，首次在零斜率下全面测定广义部分子分布及其不确定性，发现数据间存在张力，但所得引力形状因子与角动量结果与理论预测相符。

摘要：

我们首次通过同时分析所有可用的核子电磁形状因子（FFs）、核子电荷半径和磁半径、质子轴向形状因子（AFFs）以及大角度康普顿散射（WACS）截面的实验数据，给出了零斜率（ξ=0）下广义部分子分布（GPDs）及其不确定性的新测定，并研究了这些数据之间是否存在张力。这可以被认为是迄今为止对ξ=0处GPDs进行的最全面的分析。我们表明，这样的分析能够同时确定三种GPDs，即H^q、H̃^q和E^q，同时考虑了海夸克贡献。结果发现，在较大的动量转移平方Q^2=-t值下纳入WACS和AFF数据可以为GPDs提供新的约束，并在某些情况下使其发生显著改变。我们表明，WACS与质子磁形状因子（G_M^p）数据之间存在相当大的张力，尤其是在较大的-t值处。然而，我们指出，当考虑海夸克贡献并同时将WACS和G_M^p数据纳入分析时，利用提取的GPDs计算得到的引力形状因子M_2和质子总角动量J^p的结果与光锥QCD求和规则（LCSRs）和格点QCD的预测相对较好地一致。

英文摘要：

We present a new determination of the generalized parton distributions (GPDs) with their uncertainties at zero skewness, $ ξ=0 $, through a simultaneous analysis of all available experimental data of the nucleon electromagnetic form factors (FFs), nucleon charge and magnetic radii, proton axial FFs (AFFs) and wide-angle Compton scattering (WACS) cross sections for the first time, and we investigate whether there is any tension between these data. This can be considered the most comprehensive analysis of GPDs at $ ξ=0 $ performed so far. We show that such an analysis provides the simultaneous determination of three kinds of GPDs, namely $ H^q $, $ \widetilde{H}^q $ and $ E^q $, considering also the sea-quark contributions. As a result, we find that the inclusion of the WACS and AFF data at larger values of the momentum transfer squared $ Q^2=-t $ can put new constraints on GPDs and change them drastically in some cases. We show that there is a considerable tension between the WACS and the proton magnetic form factor ($ G_M^p $) data, especially at larger values of $ -t $. However, we indicate that the results for the gravitational FF $ M_2 $ and the proton total angular momentum $ J^p $ calculated using the extracted GPDs are in relatively good agreement with the light-cone QCD sum rules (LCSRs) and lattice QCD predictions when the sea-quark contributions are considered and both WACS and $ G_M^p $ data are included in the analyses simultaneously.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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