激发离子：对伴随核解离的超周边重离子碰撞的系统性处理
Exciting Ions: a Systematic Treatment of Ultraperipheral Heavy Ion Collisions with Nuclear Breakup
AI总结：
本文在 SuperChic 中系统纳入超周边重离子碰撞的相互离子激发与核解离效应，并结合强相互作用存活因子，较好描述 ATLAS、CMS 与 STAR 数据。
摘要：
我们在 SuperChic 蒙特卡罗产生器中提出了一种更新的重离子超周边碰撞（UPCs）理论处理方法。该方法特别考虑了通过碰撞离子之间额外光子交换所导致的相互离子激发。这一效应在 UPCs 中频繁发生，事实上可以（并且已经）通过安装在极前向区域的零度量能器（ZDC）探测器在数据中进行测量。本文提出的理论方法考虑了这种离子解离对中心探测器中所测量产生粒子的截面和分布产生的非平凡且不可忽略的影响。这建立在以往工作的基础上，即在同一整体框架内，同时考虑不存在由强相互作用引起的额外非弹性离子—离子散射的存活因子概率，及其对运动学的影响。我们将结果与 LHC 上 ATLAS 和 CMS 以及 RHIC 上 STAR 的数据进行了比较，发现在一系列可观测量和 ZDC 中子标记方面总体上取得了令人鼓舞的一致，但仍有进一步改进的空间，这表明纳入更高阶 QED 效应和/或调节 γA→A* 截面可能是可取的。总体而言，这使人们对本文所考虑的方法及其在标准模型内外新现象中的应用具有信心。
英文摘要：
We present an updated theoretical treatment of ultraperipheral collisions (UPCs) of heavy ions, within the SuperChic Monte Carlo generator. This in particular accounts for mutual ion excitation through additional photon exchanges between the colliding ions. This effect occurs frequently in UPCs, and indeed can be (and has been) measured in data through the use of zero degree calorimeter (ZDC) detectors installed in the far forward region. The theoretical approach presented here accounts for the non-trivial and non-negligible impact such ion dissociation has on the measured cross sections and distributions of the produced particles in the central detectors. This builds on previous work, whereby the survival factor probability of no additional inelastic ion-ion scattering due to the strong interaction, and its kinematic impact, are also accounted for within the same overall framework. We compare to data from ATLAS and CMS at the LHC, and STAR at RHIC, and find in general encouraging agreement for a range of observables and ZDC neutron tags, with some room for further improvement, suggesting the inclusion of higher order QED effects and/or tuning of the the $γA \to A^*$ cross section may be desirable. Overall, this gives confidence in the approach considered here and for applications to new phenomena within and beyond the Standard Model.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
