论文标题
通过$γ$ -Meson对的独家光生生效访问GPD
Accessing GPDs through the exclusive photoproduction of a $ γ$-meson pair
论文作者
论文摘要
我们认为在QCD分解框架中工作的光子 - 膜对的独家照片产生。明确地，我们考虑了最终状态下的$ρ$ -Meson或收费的$π$。这个过程使手性均匀的GPD和手性GPD都可以访问，这些GPD在实验上并不众所周知，尤其是后者。计算以领先顺序和领先扭曲进行。我们讨论了在实验中测量它们的前景，重点是JLAB 12-GEV实验的运动学，以及LHC的PPB超外膜碰撞。特别是，后者可以访问GPD的小$ξ$制度。
We consider the exclusive photo-production of a photon-meson pair with a large invariant mass, working in the QCD factorisation framework. Explicitly, we consider a $ ρ$-meson or a charged $ π$ in the final state. This process gives access both to chiral-even GPDs and chiral-odd GPDs, which are not well-known experimentally, especially the latter ones. The computation is performed at leading order and leading twist. We discuss the prospects of measuring them in experiments, focusing on the kinematics at the JLab 12-GeV experiment, and pPb ultra-peripheral collisions at LHC. In particular, the latter gives access to the small $ ξ$ regime of GPDs.
