Higgs Bosons, Heavy Quarks and Soft Gluons: Resummation-Improved Predictions for Associated Higgs Production Processes at the LHC

希格斯玻色子、重夸克和软胶子：大型强子对撞机相关希格斯生产过程的恢复改进预测

• 批准号: 260633026
• 负责人: Professorin Dr. Anna Kulesza
• 金额: --
• 依托单位: Brookhaven National Laboratory
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/260633026?language=en
• 关键词: Higgs; Bosons; Heavy; Quarks; Soft

The 2012 discovery of a Higgs particle at the LHC was a groundbreaking achievement in the history of particle physics. The current imperative of the LHC research programme is the determination of the properties of this new particle, in a quest to establish how closely it resembles the Higgs boson of the Standard Model (SM) of particle physics. Apart from tour de force experimental measurements, the determination of Higgs properties requires knowing corresponding theoretical predictions with high precision. One of the most highly anticipated measurements is the measurement of the coupling of the Higgs particle to top quarks. This coupling can be measured directly in the process of Higgs production in association with a top-antitop quark pair. Production processes involving the coupling of a Higgs boson to heavy quarks play also a very important role in the supersymmetric extensions of the SM of particle physics. Searches for signals of physics beyond the Standard Model and in particular for particles predicted by supersymmetric models constitutes another major research activity at the LHC for the years to come. The main goal of this project is the improvement of the accuracy of the predictions for the production of the SM Higgs boson as well as supersymmetric Higgs bosons in association with heavy quarks at the LHC. Specifically, the improvement will be achieved by calculating the effect of higher-order corrections in perturbative Quantum Chromodynamics due to the emission of soft and collinear gluons. These corrections will be treated systematically to all orders with the help of resummation techniques. The first few objectives formulated within this project relate to the associated production of the SM Higgs boson with top quarks. They focus on calculations necessary to achieve the next-to-leading-logarithmic accuracy of resummed predictions for the total cross section as well as various differential distributions. The calculations proposed in this part of the project will be the first application of analytical resummation to the associated Higgs production with top quarks in hadronic collisions. Investigating the impact of resummed soft gluon corrections on the predictions for the production of Higgs bosons of the Minimal Supersymmetric Standard Model is the subject of another set of objectives in this project. Also in this case, theoretical results will be provided for the total cross sections as well as differential distributions. Apart from analytical calculations, numerical simulations will be performed and public codes will be delivered for all processes considered in this project.

2012 年大型强子对撞机发现希格斯粒子是粒子物理学史上的一项突破性成就。大型强子对撞机研究计划当前的当务之急是确定这种新粒子的性质，以确定它与粒子物理学标准模型（SM）的希格斯玻色子的相似程度。除了杰作的实验测量之外，希格斯玻色子性质的测定还需要知道相应的高精度理论预测。最受期待的测量之一是希格斯粒子与顶夸克耦合的测量。这种耦合可以在与顶反顶夸克对相关的希格斯粒子产生过程中直接测量。涉及希格斯玻色子与重夸克耦合的生产过程在粒子物理的 SM 超对称扩展中也发挥着非常重要的作用。寻找标准模型之外的物理信号，特别是超对称模型预测的粒子，是大型强子对撞机未来几年的另一项主要研究活动。该项目的主要目标是提高对 SM 希格斯玻色子以及与大型强子对撞机中重夸克相关的超对称希格斯玻色子产生的预测的准确性。具体来说，改进将通过计算由于软胶子和共线胶子的发射而引起的微扰量子色动力学中的高阶校正的影响来实现。这些更正将借助恢复技术对所有订单进行系统处理。该项目中制定的前几个目标涉及 SM 希格斯玻色子与顶夸克的相关产生。他们专注于实现总横截面恢复预测的次领先对数精度以及各种微分分布所需的计算。该项目这一部分提出的计算将是分析恢复首次应用于强子碰撞中与顶夸克相关的希格斯产生。研究恢复的软胶子校正对最小超对称标准模型希格斯玻色子产生的预测的影响是该项目另一组目标的主题。同样在这种情况下，将为总横截面以及微分分布提供理论结果。除了分析计算之外，还将执行数值模拟，并为该项目中考虑的所有过程提供公共代码。