大光子虚度下近阈夸克偶素轻子产生的QCD分析
A QCD analysis of near-threshold quarkonium leptoproduction at large photon virtualities
摘要：
提出了一种基于算子乘积展开的计算大光子虚$Q^2$中电子-质子散射近阈值$J/ψ$和$Υ$产生截面的新方法.我们表明，该过程可以用来提取胶子部分的D-项引力形状因子的质子。在次主导水平上，它对QCD的迹线异常效应也很敏感。
英文摘要：
We propose a novel approach to compute the cross section of near-threshold $J/ψ$ and $Υ$ production in electron-proton scattering at large photon virtualities $Q^2$ based on an operator product expansion. We show that the process can be used to extract the gluon part of the D-term gravitational form factor of the proton. At the subleading level, it is also sensitive to the trace anomaly effect of QCD.
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