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

ATLAS和CMS在大型强子对撞机(LHC)的合作中发现了希格斯玻色子，这一里程碑式的发现伴随着LHCb在类Charmonium XYZ强子态上令人兴奋的强子物理发现(例如，最近对带电Z(4430)态的确认)。这些大型强子对撞机的实验合作说明了我研究计划的两个主要主题：希格斯部门的理论研究和奇异强子。 在具有经典标度不变希格斯扇区的弱电对称破缺机制中，希格斯机制是从量子修正到有效势(即Coleman-Weinberg机制)出现的。在这种方法中，实验观察到的125GeV希格斯质量可以通过大的希格斯自耦合解容纳在这些标度不变的模型中，而希格斯玻色子的小质量尺度归因于守恒的经典标度不变对称性。随着希格斯门户相互作用的加入，这一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。 我提议的研究包括探索经典的希格斯扇区的尺度不变扩展到两个二重态模型，以及具有希格斯门户相互作用的隐藏扇区暗物质模型。这个项目的目的是从这些情景中提供预测，帮助解释来自大型强子对撞机、新的希格斯实验项目和暗物质搜索的未来实验结果。对希格斯自耦合的最终测量将特别重要，因为它是标度不变希格斯机制的显著信号之一。 粒子物理学的另一个令人兴奋的领域是对类查莫尼型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。BESIII和Belle观测到的Zc(3900)以及Belle观测到并由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。 我提议的研究包括研究QCD奇异；超越传统夸克-反夸克的介子模型的状态。我们将使用QCD和规则方法来研究ZC态的质量谱和衰变模式，目的是区分对这些状态的相互竞争的解释。我们将对自旋为零和自旋1的轻重态(由夸克、反夸克和胶子激发组成的状态)与传统和奇异的JPC进行全面的QCD和规则研究，目的是确定整体的超多重态模式和质量等级，以帮助解释即将到来的GlueX和PANDA实验。 因此，我的研究计划将推进对标准模型(希格斯，奇异强子态)中新粒子的了解，以及对标准模型(暗物质)以外的新粒子的了解。

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).