论文标题
自动化的NLO Electroweak校正了在强子和Lepton Colleder的过程中
Automated NLO Electroweak Corrections to Processes at Hadron and Lepton Colliders
论文作者
论文摘要
本论文的目的是完成MC计划Whizard的NLO自动化框架，该框架在整个SM中考虑了HADRON和LEPTON COLLIDERS过程的横截面和过程分布的NLO校正。具体而言，它建立在用于NLO QCD计算的实施的FKS减法方案上，并将其扩展到自动化的NLO EW和QCD-EW混合更正。为此，在混合耦合扩展中将实施的FKS方案推广到系统减去QED和QCD红外（IR）差异。 NLO贡献的自动计算已在LHC的一组基准过程中验证，包括e。〜g。 $ t \ bar {t}〜（+H/W/Z）$生产。 $ e^+e^ - $过程的交叉检查同样表明，Whizard可以用于Lepton Colliders的预测，包括固定的$ \ Mathcal {O}（O}（α）$校正。该框架应用于对未来多型MUON对撞机的多个玻色子过程的NLO EW横截面和差分分布的研究。对于某些高能Lepton挑战者的设置，微小的初始状态群众危害了在QED扰动理论中可观察到的固定顺序扩展的可靠性。为了恢复对NLO EW可观察物的有意义的预测，必须应用QED Parton分布函数（PDFS），以确保对共线ISR效应的普遍处理。但是，这导致MC集成措施的计算挑战。本文提出了应对这些困难的方法。随着HADRON和LEPTON碰撞过程的NLO EW校正的自动化，Whizard为当前和将来的山液中的EW精度研究提供了强大的工具，并为新物理搜索提供了预期的预测水平。
The aim of this thesis is the completion of the NLO automated framework of the MC program WHIZARD, accounting for NLO corrections in the full SM for cross sections and distributions of processes at hadron and lepton colliders. Specifically, it builds on the implemented FKS subtraction scheme for NLO QCD calculations, and extends it to automated NLO EW and QCD-EW mixed corrections. To that end, the implemented FKS scheme is generalised to systematically subtract QED and QCD infrared (IR) divergences in mixed coupling expansions. The automated computation of NLO contributions is validated for a set of benchmark processes at the LHC, including e.~g. $t\bar{t}~(+H/W/Z)$ production. Cross-checks for $e^+e^-$ processes likewise show that WHIZARD can be used for predictions at lepton colliders including fixed $\mathcal{O}(α)$ corrections. This framework is applied to the study of NLO EW cross sections and differential distributions for multi-boson processes at a future multi-TeV muon collider. For some high-energy lepton-collider setups, tiny initial-state masses jeopardise the reliability of fixed-order expansions of observables in QED perturbation theory. In order to recover meaningful predictions for NLO EW observables, QED parton-distribution functions (PDFs) must be applied guaranteeing a universal treatment of collinear ISR effects. This however causes computational challenges for MC integration measures. Methods to cope with these difficulties are presented in this thesis. With the automation of NLO EW corrections for hadron and lepton collision processes, WHIZARD offers a powerful tool for EW precision studies at current and future colliders and provides the desired accuracy level of predictions for new physics searches.
