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arXiv 2107.09557hep-ph
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超外围碰撞和低x射线物理

Ultraperipheral collisions and low-x physics

Tuomas Lappi

摘要:

LHC和RHIC的超周边碰撞为光子-核子和光子-核碰撞提供了目前最高的可用能量。因此,它们是研究小$x$强子和核的胶子结构的有用工具。我们讨论了最近的理论工作,以了解在QCD微扰理论的非线性光学精度的排他性过程。这些理论上的进展也是直接相关的理解在小$x$深非弹性散射的物理。我们还讨论了超周边碰撞的实验结果,最突出的独家矢量介子生产。

英文摘要:

Ultraperipheral collisions at the LHC and RHIC offer the highest currently available energy for photon-nucleon and photon-nucleus collisions. Thus they are a valuable tool for studying the gluonic structure of hadrons and nuclei at small $x$. We discuss recent theoretical work towards understanding such exclusive processes at NLO accuracy in QCD perturbation theory. These theoretical advances are also immediately relevant for understanding the physics of deep inelastic scattering at small $x$. We also discuss experimental results in ultraperipheral collisions, most prominently for exclusive vector meson production.

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