在LHC和RHIC上与双粒子事件generator的相干和非相干超周边AA碰撞中的亚核子涨落
Subnucleon fluctuations in coherent and incoherent ultra-peripheral AA collisions at LHC and RHIC with the Sartre event generator
摘要：
在电子-离子对撞机（EIC）中，光子-原子核过程以及在LHC和RHIC中的超周边碰撞（UPC）都被广泛地应用于描述光子-原子核过程。事件发生器是一个事件发生器，它实现了DIS的偶极模型，并在坐标空间中模拟目标核或质子的横向几何形状。它使用Good-Walker机制模拟波动，这有助于非相干截面的目标打破后的相互作用。随着UPC测量精度的提高，在过去的几年里，偶极子模型的详细测试已经成为可能，并发现缺乏ESTA的模型。在这些程序中，我们将亚核子涨落添加到原子核中，并表明这足以描述绝大多数当前测量结果。我们还发现，对于更大的动量转移的核，探测胶子波动在更高的分辨率，目前的模型的复杂性可能不够。未来在大型强子对撞机、RHIC，特别是EIC的测量有可能揭示这些胶子真空涨落，并收集对QCD自相互作用量子场的新见解。
英文摘要：
Sartre has been extensively used for describing photon-nuclei processes at the electron-ion collider (EIC) as well as ultra-peripheral collisions (UPC) at LHC and RHIC. Sartre is an event generator which implements the dipole model for DIS, and models the transverse geometry of the target nucleus or proton in coordinate space. It uses the Good-Walker mechanism for simulating fluctuations which contribute to the incoherent cross section for which the target breaks up after the interaction. With improved precision of UPC measurements in the last years, a detailed test of the dipole model has become possible, and Sartre's model was found lacking. In these proceedings we add subnucleon fluctuations to the nucleus and show that this is sufficient for describing the vast majority of the present measurements. We also find that for larger momentum transfers in the nucleus, which probes gluon fluctuations at higher resolution, the current complexity of the model may not suffice. Future measurements at the LHC, RHIC and especially the EIC has the potential to reveal these gluon vacuum fluctuations and glean novel insights into the self-interacting quantum field of QCD.
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