超周边$pA$碰撞中胶子Wigner分布的计算
Accessing the gluon Wigner distribution in ultraperipheral $pA$ collisions
摘要：
本文提出通过研究RHIC和LHC超周边质子-核碰撞中的双喷注产生过程来约束核子中的胶子维格纳分布。与参考文献[Y.哈达湾W. Xiao和F. Yuan，Phys. Rev. Lett. 116，202301（2016）.]为了研究轻子-核子散射中相同的可观测量，使用UPC有几个优点：不仅截面更大，而且从数据中提取维格纳分布也变得更简单，包括它的椭圆角依赖性。我们计算了相应的截面，并使用模型，其中包括胶子饱和效应的系数进行评估。还讨论了在当前和未来的实验设施的维格纳分布的测量的潜力。
英文摘要：
We propose to constrain the gluon Wigner distribution in the nucleon by studying the exclusive diffractive dijet production process in ultraperipheral proton-nucleus collisions (UPCs) at RHIC and the LHC. Compared to the previous proposal in Ref. [Y. Hatta, B. W. Xiao, and F. Yuan, Phys. Rev. Lett. 116, 202301 (2016).] to study the same observable in lepton-nucleon scattering, the use of UPCs has a few advantages: not only is the cross section larger, but the extraction of the Wigner distribution from the data also becomes simpler, including its elliptic angular dependence. We compute the corresponding cross section and evaluate the coefficients using models which include the gluon saturation effects. A potential for the measurements of the Wigner distribution at current and future experimental facilities is also discussed.
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