Precision calculations for loop-induced Higgs-boson production and decay processes

环路诱导希格斯玻色子产生和衰变过程的精确计算

• 批准号: 436076086
• 负责人: Dr. Christian Sturm
• 金额: --
• 依托单位: Institut für Theoretische Physik und Astrophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/436076086?language=en
• 关键词: Precision; calculations; loop; induced; Higgs

One of the most important achievements of particle physics in the last decade was the discovery of a Higgs boson at the Large Hadron Collider(LHC) experiments. This new particle is now central object of intense investigations, both in theory and experiment, in order to precisely determine its properties. In particular, it is interesting to understand whether this Higgs boson is just the Standard Model(SM) Higgs boson or whether it is part of a more general theory. In order to give answers to this question precise theory predictions are necessary, both within the SM as well as within extensions of the SM. These precise theory predictions are addressed in this project.Loop-induced processes play a special key role in the context of Higgs physics. Since the Higgs boson only couples to massive particles, Higgs-boson production and decay processes which involve massless particles in the initial or final state, like gluons or photons, proceed via a massive particle loop. These loop-induced processes are important on the one hand since they contributed substantially to the discovery of a Higgs-boson at the LHC, on the other hand they are sensitive to new physics beyond the SM.One of the simplest extensions of the Higgs sector of the SM is the one with an extra spin-zero gauge singlet added to the SM fieldcontent. This model has a rich collider phenomenology which can be tested at the LHC. This model can also give answers to still open questions, which remain unanswered within the SM, like for example, the question of the nature of dark matter or the question of the origin of the matter-antimatter asymmetry of the Universe. Within this project the impact of electroweak correction in perturbation theory to loop-induced processes shall be analyzed. Since the leading-order process for loop-induced processes is already at the one-loop level, the computation of next-to-leading order corrections involves here already the computation of challenging two-loop diagrams.

在过去十年中，粒子物理学最重要的成就之一是在大型强子对撞机（LHC）实验中发现了希格斯玻色子。在理论和实验上，这个新粒子现在是强烈研究的中心对象，以精确确定其特性。 特别是，了解这种希格斯玻色子是否只是标准模型（SM）higgs玻色子，还是它是更通用理论的一部分。为了回答这个问题，必须在SM和SM的扩展中进行精确的理论预测。这些精确的理论预测在此项目中得到了解决。环路诱导的过程在希格斯物理学的背景下起着特殊的关键作用。由于希格斯玻色子只伴侣伴侣与巨大的颗粒相结合，因此，希格斯 - 玻色子的产生和衰减过程，涉及在初始或最终状态（例如胶子或光子）中无质量颗粒的过程，请通过巨大的粒子环进行。这些循环引起的过程一方面很重要，因为它们为在LHC发现Higgs-Boson的发现做出了重大贡献，另一方面，它们对SM最简单的SM最简单的SM的SM之外的新物理敏感，SM是SM的最简单扩展，是一个额外的Spin-Zer-Zer-Zer-Zer-Zer-Zer-Zer-Zer-Zerige Singlets Singlelet添加到SM Sm sm FieldContcontcontcontcontcontcontcontcontcontcontcontcontcontcontcontcontcontcontcontcontcontcontcontcontcontcontcontctent contctctent ext。该模型具有丰富的对撞机现象学，可以在LHC进行测试。该模型还可以为仍在开放的问题提供答案，这些问题在SM中仍未得到答复，例如，暗物质的性质或物质 - 抗逆不是对称性的宇宙不对称性的问题。 在该项目中，应分析扰动理论中电​​子校正对循环引起的过程的影响。由于循环引起的过程的前阶过程已经在单循环级别上，因此在这里临时订单校正的计算已经涉及到具有挑战性的两环图的计算。