New Approaches to Beyond Standard Model Searches with Colliders and Cosmology

利用对撞机和宇宙学超越标准模型搜索的新方法

• 批准号: SAPIN-2018-00032
• 负责人: Curtin, David
• 金额: $ 3.64万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=690055
• 关键词: New; Approaches; Beyond; Standard; Model

The Large Hadron Collider (LHC) era presents us with a puzzle. Extensions to the Standard Model (SM) are as urgently needed as ever, but none of the canonically expected signals have shown up so far. Resolving this conundrum requires new perspectives on what types of signals are theoretically motivated and new approaches to experimental searches. This challenge and opportunity provides the unifying theme of my research in phenomenology.******Long-lived particles (LLPs) produced at colliders generically arise in many Beyond SM (BSM) scenarios and could reveal the secrets of naturalness, dark matter, and baryogenesis. In the past, the focus on signals inspired by minimal supersymmetry meant that LLPs received much less attention. This is now changing, in significant part due to my work. I am spearheading research into LLP signals at the LHC and am collaborating with experimentalists and theorists to help determine the roadmap of BSM searches for the coming decade.******Born from these investigations is our MATHUSLA detector proposal, which can increase LHC sensitivity to LLP signals by three orders of magnitude. Progress has been swift, and I am now helping to lead the efforts of over 100 theorists and experimentalists to make this idea a reality. Given MATHUSLA's potential for discovery the importance of this endeavor cannot be overstated, making it a major focus for me in the coming years. It also represents a unique opportunity for Canada to take on a leadership position in fundamental particle physics.******The discovery of the Higgs boson has opened up many exciting avenues of investigation for both SM and BSM physics.******Hidden Sectors can lead to a plethora of as-yet undetected collider signals, modify cosmology and even impact astrophysics. They are theoretically motivated for a variety of top-down and bottom-up reasons, but recently their potential to address the hierarchy problem has come into focus. Exotic Higgs decays are a unique portal to these theories at the LHC. Theories of Neutral Naturalness lead to spectacular LLP signals and are a major motivation for their study, but many aspects of their nonperturbative dynamics, theoretical UV completions, and cosmological consequences are not understood.******Study of the Higgs also allows us to begin probing the Electroweak Phase Transition, which is of fundamental importance for our understanding of cosmology, and may play a role in explaining the universe's matter-antimatter asymmetry via the mechanism of Electroweak Baryogenesis. This requires the introduction of new theoretical tools to deal with challenging aspects of Finite-Temperature Quantum Field Theory. Only by making calculations robust and model-independent can we conclusively discover or exclude these and other important theoretical ideas.******Finally, many BSM scenarios can only be probed at future colliders, and articulating this physics case will determine the future of our field in the coming decades.

大型强子对撞机（LHC）时代为我们带来了难题。标准模型（SM）的扩展一如既往地需要，但是到目前为止，没有一个规范的预期信号出现。解决这个难题需要关于哪种类型的信号是理论上动机和实验搜索的新方法的新观点。这个挑战和机会提供了我现象学研究的统一主题。******在山脉中产生的长寿命颗粒（LLP）通常在SM（BSM）场景之外出现，并且可以揭示自然性，暗物质和Baryogenesease的秘密。过去，对最小超对称性启发的信号的关注意味着LLP受到的关注要少得多。现在，这正在发生变化，这在很大程度上是由于我的工作。我将在LHC上对LLP信号进行研究，并与实验者和理论家合作，以帮助确定未来十年的BSM搜索路线图。******从这些调查中出生的******是我们的Mathusla探测器提案，这可以提高LHC对LHC对LLP信号的敏感性。进步一直很快，我现在正在帮助领导100多名理论家和实验者的努力，以使这一想法成为现实。鉴于Mathusla的发现潜力，这一努力的重要性不能被夸大，因此在未来几年对我来说，这是我的主要重点。这也代表了加拿大在基本粒子物理学领域的领导地位的独特机会。理论上是出于各种自上而下和自下而上的理由是有动力的，但是最近他们解决了等级问题问题的潜力已成为焦点。异国情调的希格斯衰减是LHC这些理论的独特门户。 Theories of Neutral Naturalness lead to spectacular LLP signals and are a major motivation for their study, but many aspects of their nonperturbative dynamics, theoretical UV completions, and cosmological consequences are not understood.******Study of the Higgs also allows us to begin probing the Electroweak Phase Transition, which is of fundamental importance for our understanding of cosmology, and may play a role in explaining the universe's物质 - 抗焦点不对称性通过电动性男性生成的机理。这需要引入新的理论工具来处理有限温度量子场理论的具有挑战性的方面。只有通过计算可靠和与模型无关的计算，我们才能最终发现或排除这些和其他重要的理论思想。