Rasmussen Christine O, Sjöstrand Torbjörn
Theoretical Particle Physics, Department of Astronomy and Theoretical Physics, Lund University, Sölvegatan 14A, 223 62 Lund, Sweden.
Eur Phys J C Part Fields. 2018;78(6):461. doi: 10.1140/epjc/s10052-018-5940-8. Epub 2018 Jun 7.
The LHC has brought much new information on total, elastic and diffractive cross sections, which is not always in agreement with extrapolations from lower energies. The default framework in the Pythia event generator is one case in point. In this article we study and implement two recent models, as more realistic alternatives. Both describe total and elastic cross sections, whereas one also includes single diffraction. Noting some issues at high energies, a variant of the latter is proposed, and extended also to double and central diffraction. Further, the experimental definition of diffraction is based on the presence of rapidity gaps, which however also could be caused by colour reconnection in nondiffractive events, a phenomenon that is studied in the context of a specific model. Throughout comparisons with LHC and other data are presented.
大型强子对撞机带来了许多关于总截面、弹性截面和衍射截面的新信息，这些信息并不总是与低能外推结果一致。Pythia事件生成器中的默认框架就是一个例子。在本文中，我们研究并实现了两个近期的模型，作为更现实的替代方案。两者都描述了总截面和弹性截面，而其中一个还包括单衍射。注意到高能情况下的一些问题，我们提出了后者的一个变体，并将其扩展到双衍射和中心衍射。此外，衍射的实验定义基于快度间隙的存在，但这也可能由非衍射事件中的色重连引起，本文在一个特定模型的背景下研究了这一现象。全文都给出了与大型强子对撞机及其他数据的比较。
