论文标题
向后的脉络顿散射以破译核子的光子含量
Backward timelike Compton scattering to decipher the photon content of the nucleon
论文作者
论文摘要
在共同QCD分解的框架中，讨论了由小型mandelstam变量$ -U $指定的向后区域中的大型质量Lepton对的核子的独家光生源。幅度是根据光子到核子转变分布幅度（TDA）分解的，该分布幅度（TDA）编码核子的光子含量。描述了这些新的非扰动对象的模型估计，并计算了相应的横截面。在感兴趣的运动学制度中，由于电磁贝斯赫特勒的过程而引起的背景可忽略不计。
The exclusive photoproduction off nucleon of a large invariant mass lepton pair in the backward region specified by the small Mandelstam variable $-u$ is discussed in the framework of collinear QCD factorization. The amplitude is factorized in terms of photon-to-nucleon Transition Distribution Amplitudes (TDAs) which encode the photon content of the nucleon. Model estimates of these new non-perturbative objects are described and the corresponding cross sections calculated. The background due to the electromagnetic Bethe-Heitler process is shown to be negligible in the kinematical regime of interest.
