Higher-order corrections for effective field theories

有效场论的高阶修正

• 批准号: 2876651
• 金额: --
• 依托单位: Durham University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2876651
• 关键词: Higher; order; corrections; effective; field

There is currently much effort by phenomenologists and experimentalists alike to constrain new physics contributions using LHC data within the SMEFT framework. Higgs physics is central to this programme, also at future colliders. A dedicated treatment requires, first and foremost, a precise modelling of the SM contributions to benchmark Higgs decay and pro-duction modes. Furthermore, including NLO EW and QCD corrections from dimension-6 SMEFT operators is extremely beneficial, both in order to give a realistic view of the number of operators contributing to a given process, and also to stabilise the dependence on unphysical renormalisation scales. While in recent years the calculation of NLO QCD corrections within SMEFT has developed considerably, EW corrections are still in their infancy, limited to a handful of simple processes at parton level and thus not immediately available for serious analyses of experimental data. This project willdevelop a comprehensive tool for modelling Higgs decays within SMEFT, including both EW and QCD corrections originating in the SM and SMEFT to production and decay in phenomenologically relevant channels.interface this tool to the NNLO accurate description of Higgs boson production in the SHERPA event generator. In addition, this allows its parton level out-put to be subjected to the parton showers and hadronisation modules of the SHERPA framework, allowing for a realistic and experimentally usable description of the fully exclusive final state.

目前，现象学家和实验学家都在努力限制在SMEFT框架内使用LHC数据的新物理贡献。希格斯物理是这个项目的核心，也是未来对撞机的核心。一个专门的处理首先需要对SM对基准希格斯衰变和产生模式的贡献进行精确建模。此外，包括来自6维SMEFT算子的NLO EW和QCD校正是非常有益的，既可以提供对给定过程做出贡献的算子数量的现实视图，也可以稳定对非物理重整化尺度的依赖。虽然近年来在SMEFT中计算NLO QCD校正有了很大的发展，但EW校正仍处于起步阶段，仅限于少数几个简单的过程，因此不能立即用于实验数据的认真分析。该项目将开发一个全面的工具，用于模拟SMEFT中的希格斯玻色子衰变，包括源自SM和SMEFT的EW和QCD校正，以及在现象相关通道中的产生和衰变。将该工具与NNLO在SHERPA事件发生器中对希格斯玻色子产生的准确描述相连接。此外，这允许其部分水平输出受到SHERPA框架的部分阵雨和强子化模块的影响，从而允许对完全排他性的最终状态进行现实和实验可用的描述。