标题： 利用核碎裂产生的前向中子在超外力碰撞中切片庞姆龙 显示英文标题

标题： Slicing Pomerons in ultraperipheral collisions using forward neutrons from nuclear breakup

摘要： 我们认为，在入射高能光子-核（$\gamma A$）散射中的核破裂过程中对前向中子的测量，为研究重离子超外围碰撞（UPCs）中QCD的小-$x$动力学提供了一种新方法。 利用实光子的强子涨落模型和核碎片化中的中子发射模型，我们计算了在LHC中的$\gamma Pb$碰撞中产生的蒸发中子数量分布。 我们表明，该分布与受损核子的数量（非弹性碰撞）相关，因此可以限制核阴影机制及其$x$依赖性。 显示英文摘要

摘要： We argue that measurements of forward neutrons from nuclear breakup in inclusive high energy photon-nucleus ($\gamma A$) scattering provide a novel way to study small-$x$ dynamics of QCD in heavy-ion ultraperipheral collisions (UPCs). Using models for hadronic fluctuations of the real photon and neutron emission in nuclear fragmentation, we calculate the distribution over the number of evaporation neutrons produced in $\gamma Pb$ collisions at the LHC. We show that it is correlated with the number of wounded nucleons (inelastic collisions) and, hence, can constrain the mechanism of nuclear shadowing and its $x$ dependence.