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在 SMEFT 框架内使用大型强子对撞机数据来限制新的物理学贡献。希格斯物理学是该计划的核心，也是未来对撞机的核心。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，既可以真实地了解对给定过程做出贡献的算子数量，也可以稳定对非物理重正化尺度的依赖。尽管近年来 SMEFT 内 NLO QCD 校正的计算有了很大发展，但 EW 校正仍处于起步阶段，仅限于部分子级别的少数简单过程，因此无法立即用于对实验数据进行认真的分析。该项目将开发一个用于在 SMEFT 内对希格斯玻色子衰变进行建模的综合工具，包括源自 SM 和 SMEFT 的 EW 和 QCD 校正，以对现象学相关通道中的产生和衰变进行校正。将该工具与 SHERPA 事件生成器中希格斯玻色子产生的 NNLO 准确描述相连接。此外，这使得其部分子级输出能够受到 SHERPA 框架的部分子簇射和强子化模块的影响，从而可以对完全专有的最终状态进行现实且可在实验上使用的描述。