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: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=614390
• 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).

在大型强子对撞机（LHC）上，ATLAS和CMS合作对希格斯玻色子的里程碑式发现伴随着LHCb对粲偶素类XYZ强子态（例如，充电Z（4430）状态的最近确认）。这些LHC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。 在具有经典标度不变的希格斯扇区的电弱对称破缺机制中，希格斯机制来自于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的希格斯质量可以容纳在这些尺度不变模型的大希格斯自耦合解决方案，和小质量尺度的希格斯玻色子是由于保管经典的尺度不变性symmetrical. With列入一个希格斯门户相互作用，这种机制超出标准模型的扩展提供了一个自然的场景宇宙学稳定的暗物质。 我提出的研究包括探索经典的尺度不变的扩展希格斯部门的两个双重模型，并隐藏部门暗物质模型与希格斯门户的相互作用。该计划的目的是从这些场景中提供预测，以帮助解释LHC，新希格斯实验计划和暗物质搜索中出现的未来实验结果。希格斯粒子自耦合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著信号之一。 粒子物理学中另一个令人兴奋的领域是对粲偶素类XYZ介子的有趣观测，它挑战了我们传统的夸克-反夸克介子模型的概念。由BESIII和贝儿观测到的Zc（3900），沿着由贝儿观测到并被LHCb证实的Zc（4430），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组态。 我建议的研究包括QCD奇异性的研究;量子色动力学（QCD）和规则方法将被用来研究Zc态的质量谱和衰变模式，目的是区分对这些态的竞争解释。对自旋为零和自旋为一的轻和重轻杂化粒子的全面QCD和规则研究（由夸克，反夸克和胶子激发组成的状态）与常规和异国情调的JPC将进行，目标是确定整体超多重态模式和质量层次，以帮助解释即将到来的GREX和PANDA实验。 因此，我的研究计划将推进标准模型（希格斯，外来强子态）和超越标准模型（暗物质）的新粒子的知识。