arXiv 0812.03952008-12-02hep-ph

实、虚Compton散射中的局域双光子耦合和J=0固定极点

Local Two-Photon Couplings and the J=0 Fixed Pole in Real and Virtual Compton Scattering

Stanley J. Brodsky, Felipe J. Llanes-Estrada, Adam P. Szczepaniak

备注：: 20 pages, 15 figures
发表信息：: Phys.Rev.D79:033012,2009
DOI：: 10.1103/PhysRevD.79.033012

摘要：

两个光子与强子的基本夸克流的局域耦合对康普顿振幅的贡献与能量无关，与撞击夸克的电荷平方成正比，这种贡献在强子散射反应中没有类似的。我们表明，这种本地的贡献有一个真正的阶段，是普遍的，给任何光子的虚拟性和偏斜在固定的动量转移平方t的真实或虚拟康普顿散射相同的贡献。这个J=0的固定Regge极的t依赖性由靶核子的尚未测量的偶电荷共轭形状因子参数化。t=0的极限通过Weisberger关系给出了核子质量对夸克质量依赖性的重要约束。我们讨论如何1/x形状因子可以从高能量深虚康普顿散射中提取，并检查H广义部分子分布模型给出的预测。

英文摘要：

The local coupling of two photons to the fundamental quark currents of a hadron gives an energy-independent contribution to the Compton amplitude proportional to the charge squared of the struck quark, a contribution which has no analog in hadron scattering reactions. We show that this local contribution has a real phase and is universal, giving the same contribution for real or virtual Compton scattering for any photon virtuality and skewness at fixed momentum transfer squared t. The t-dependence of this J=0 fixed Regge pole is parameterized by a yet unmeasured even charge-conjugation form factor of the target nucleon. The t=0 limit gives an important constraint on the dependence of the nucleon mass on the quark mass through the Weisberger relation. We discuss how this 1/x form factor can be extracted from high energy deeply virtual Compton scattering and examine predictions given by models of the H generalized parton distribution.

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