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Higgs production and decay in models with extra singlets and doublets - Precise predictions forthe LHC

具有额外单峰和双峰的模型中希格斯粒子的产生和衰变 - LHC 的精确预测

基本信息

批准号：
249274740
负责人：
Professor Dr. Ansgar Denner
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：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/249274740?language=en
关键词：
Higgs production decay models extra

项目摘要

The discovery of a Higgs particle at the LHC was a spectacular success of particle physics. As next step the properties of this particle have to be measured precisely and it must be investigated whether the new boson is the Higgs boson of the Standard Model. This requires to study extended models and to compare them to experimental data. An interesting class of extended models are those with additional Higgs singlets and doublets. These models are in accordance with precision tests and approach the Standard Model in the decoupling limit, i.e. if the masses of the extra Higgs bosons get large and the couplings are chosen appropriately. Moreover, they allow for a consistent description of additional physical Higgs bosons which are searched for at the LHC. Since the differences between the Standard Model and these extended models might be small, precise theoretical predictions including corrections of next-to-leading order are mandatory. The calculation of these corrections requires a consistent formulation of these theories in higher orders and, in particular, a renormalization.This project aims at the investigation of Standard Model extensions with additional Higgs singlets or doublets. We will, in particular, study models with one additional Higgs singlet or doublet. We will first define the complete renormalization procedure of these models and work out the renormalization explicitly at next-to-leading order. Then, the important Higgs production and decay processes will be evaluated including next-to-leading-order strong and electroweak corrections. Finally, the results will be implemented into existing Monte Carlo programs. The resulting codes will be made available to the experimental collaborations for data analysis.

在大型强子对撞机上发现希格斯粒子是粒子物理学的一个巨大成功。下一步，必须精确测量该粒子的属性，并必须研究新玻色子是否是标准模型的希格斯玻色子。这需要研究扩展模型并将其与实验数据进行比较。一类有趣的扩展模型是那些额外的希格斯单线态和双线态。这些模型符合精度测试，并在解耦极限下接近标准模型，即如果额外的希格斯玻色子的质量变大并且耦合被适当地选择。此外，它们允许在LHC中搜索的额外物理希格斯玻色子的一致描述。由于标准模型和这些扩展模型之间的差异可能很小，因此精确的理论预测，包括对次主导阶的修正是强制性的。这些修正的计算需要这些理论在更高阶的一致性表述，特别是重整化。这个项目的目的是调查标准模型扩展与额外的希格斯单线态或双线态。我们将特别研究带有一个额外的希格斯单线态或双线态的模型。我们将首先定义这些模型的完整重整化过程，并在次首阶显式地计算重整化。然后，重要的希格斯粒子的产生和衰变过程将进行评估，包括次领先的强和电弱修正。最后，将实施到现有的蒙特卡罗程序的结果。由此产生的代码将提供给实验合作进行数据分析。