Theory and Phenomenology of New Particles in the Standard Model and Beyond

标准模型及其他模型中新粒子的理论和现象学

• 批准号: SAPIN-2015-00038
• 负责人: Steele, Thomas
• 金额: $ 2.67万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=665872
• 关键词: Theory; Phenomenology; New; Particles; Standard

The landmark discovery of the Higgs boson by the ATLAS and CMS collaborations at the Large Hadron Collider (LHC) are accompanied by exciting hadronic physics discoveries by LHCb on the charmonium-like XYZ hadronic states (e.g., the recent confirmation of the charged Z(4430) state). These LHC experimental collaborations illustrate the main two themes of my research program: theoretical studies of the Higgs sector and exotic hadrons. ***In electroweak symmetry breaking mechanisms with classically scale-invariant Higgs sectors, the Higgs mechanism emerges from the quantum corrections to the effective potential (i.e. the Coleman-Weinberg mechanism). In this approach, the experimentally observed 125 GeV Higgs mass can be accommodated in these scale-invariant models by a large Higgs self-coupling solution, and the small mass scale of the Higgs boson is attributed to a custodial classical scale-invariance symmetry.  With the inclusion of a Higgs portal interaction, extensions of this mechanism beyond the Standard Model  provides a natural scenario for cosmologically-stable dark matter. ***My proposed research includes exploration of classically scale-invariant extensions of the Higgs sector to two-doublet models, and to hidden sector dark-matter models with Higgs portal interactions. The purpose of this program is to provide predictions from these scenarios that can help interpret future experimental results emerging from the LHC, new Higgs experimental programs, and dark matter searches. The eventual measurement of the Higgs self-coupling will be particularly important, because it is one of the striking signals of the scale-invariant Higgs mechanism.***Another exciting area in particle physics are the intriguing observations of the charmonium-like XYZ mesons that challenge our concepts of conventional quark-antiquark models of mesons. The Zc(3900) observed by BESIII and Belle along with the Zc(4430) observed by Belle and confirmed by LHCb are the most striking examples, because their minimal quark content requires a tetraquark configuration. ***My proposed research includes study of QCD exotica; states that go beyond conventional quark-antiquark  models of mesons.  QCD sum-rule methods will be used to study the mass spectrum  and decay decay modes of the Zc states, with a goal of distinguishing between competing interpretations for these states.  A comprehensive QCD sum-rule study of the spin-zero and spin-one light and heavy-light hybrids (states composed of a quark, antiquark, and gluonic excitation) with conventional and exotic JPC will be conducted, with a goal of identifying overall supermultiplet patterns and  mass hierarchies to aid in the interpretation of the upcoming GlueX and PANDA experiments.*** Thus my research program will advance knowledge of new particles in the Standard Model (Higgs, exotic hadronic states) and  beyond the Standard Model (dark matter).*****

ATLAS 和 CMS 合作在大型强子对撞机 (LHC) 上发现了具有里程碑意义的希格斯玻色子，同时 LHCb 在类似粲云的 XYZ 强子态上也取得了令人兴奋的强子物理发现（例如，最近确认了带电 Z(4430) ）这些大型强子对撞机实验合作说明了我的研究计划的两个主要主题：希格斯扇区和奇异强子的理论研究***弱电。具有经典尺度不变希格斯扇区的对称破缺机制，希格斯机制来自对有效势的量子修正（即科尔曼-温伯格机制），在这种方法中，实验观察到的 125 GeV 希格斯质量可以容纳在这些尺度中。大希格斯自耦合解的不变模型，而希格斯玻色子的小质量尺度归因于保管经典尺度不变性通过包含希格斯门户相互作用，这种机制的扩展超出了标准模型，为宇宙稳定的暗物质提供了一个自然的场景***我提出的研究包括探索希格斯扇区的经典尺度不变扩展。 -双峰模型，以及具有希格斯门户相互作用的隐藏扇形暗物质模型 该程序的目的是提供这些场景的预测，以帮助解释大型强子对撞机（新希格斯）出现的未来实验结果。实验计划和暗物质搜索的最终测量将特别重要，因为它是尺度不变希格斯机制的显着信号之一。***粒子物理学中另一个令人兴奋的领域是有趣的领域。 BESIII 和 Belle 观测到的 Zc(3900) 以及 BESIII 观测到的 Zc(4430) 挑战了我们对传统夸克-反夸克介子模型的概念。 Belle 和 LHCb 证实是最引人注目的例子，因为它们的最小夸克含量需要四夸克配置***我提出的研究包括超越传统的夸克-反夸克介子模型的研究。将用于研究 Zc 态的质谱和衰变模式，目的是区分这些态的相互竞争的解释，对自旋零和自旋一光进行全面的 QCD 和规则研究。将使用传统和奇异的 JPC 进行重轻混合（由夸克、反夸克和胶子激发组成的状态），目标是确定总体超多重态模式和质量层次结构，以帮助解释即将进行的 GlueX 和 PANDA 实验。 ***​因此，我的研究计划将增进对标准模型（希格斯粒子、奇异强子态）和标准模型之外（暗物质）中新粒子的了解。*****