The Higgs Boson as a Probe of Physics Beyond the Standard Model

2012年，在大型强子对撞机（LHC）上发现希格斯玻色子成为国际头条新闻。一种新的基本粒子被发现了，解释我们周围绝大多数现象的理论，标准模型（SM）已经完成。然而，SM仍然存在未解决的难题。其中一个难题，即层次问题，是在SM中，希格斯玻色子的质量需要独立参数的戏剧性取消，但如果在LHC中发现新的现象和粒子，这个问题就可以解决。 更多的希格斯玻色子将在大型强子对撞机中产生，我将与卡尔顿大学理论和实验粒子物理组的其他希格斯专家合作，探索新的技术来研究最近发现的玻色子的性质。对这种粒子的详细描述有可能揭示标准模型没有描述的新现象。希格斯粒子衰变的一个特别有趣的方式是变成四个轻子（电子和它的更重的表亲μ子），我计划在我以前探索这种衰变的工作的基础上，展示它如何被用作许多有趣理论的探测器，其中一些可以解决层次问题。 LHC及其探测器是非常复杂的机器，每秒发生数百万次质子-质子碰撞事件。因此，在寻找新的物理学时，有一种寻找什么的感觉是非常重要的。除了研究希格斯玻色子，我还将开发理论模型，包括一些涉及修改希格斯玻色子性质的模型，这些模型在LHC上产生了目前尚未被搜索到的奇异的新签名。此外，我将与学生一起研究通过实验探索这些模型的不同方法。这些模型将受到解决层次问题、暗物质之谜和SM没有解决的其他关于自然的开放性问题的启发。我之前对新兴喷流的研究为LHC实验开辟了一条新的研究途径，而这个项目的继续将有助于确保如果LHC数据中有突破性的发现等待着我们，它不会被错过。 最后，如果有发现，我将开发方法，在大型强子对撞机上用新的测量来表征它。此外，我还将建立模型来描述新的物理学，并将其置于SM以及超越SM的动机良好的理论的背景下。任何发现都会让我们对宇宙的运作有一个新的认识，但它也会带来许多谜团，我将致力于开发技术，使我们能够更深入地了解自然。

The discovery of the Higgs Boson at the Large Hadron Collider (LHC) in 2012 generated international headlines. A new fundamental particle had been discovered, and the theory that explains the vast majority of phenomena that we see around us, the Standard Model (SM), had been completed. Yet, there are still puzzles that the SM leaves unsolved. One of these puzzles, the hierarchy problem, is that within the SM, the mass of the Higgs boson requires a dramatic cancellation of independent parameters, but this problem can be solved if there are new phenomena and particles to be discovered at the LHC. Many more Higgs bosons will be produced at the LHC, and I will work with the other Higgs experts in the Carleton University theoretical and experimental particle physics groups to explore novel techniques to study the properties of the recently discovered boson. Detailed characterization of this particle has the potential to uncover new phenomena not described by the Standard Model. One particularly interesting way the Higgs decays is to four leptons (electrons, and its heavier cousin the muon), and I plan to build on my previous work exploring this decay to show how it can be used as a probe of many interesting theories, some of which can solve the hierarchy problem. The LHC and its detector are incredibly complex machines where millions of proton-proton collision events occur every second. Therefore, when looking for new physics, it is very important to have a sense of what to look for. In addition to studying the Higgs, I will develop theoretical models, including some that involve modifications of the properties of the Higgs, that produce exotic new signatures at the LHC that are not currently being searched for. Furthermore, I will work with students to study different ways that these models can be explored by experiments. These models will be inspired by solving the hierarchy problem, the dark matter puzzle, and other open questions about nature that the SM does not address. My previous research on emerging jets led to a new avenue of research at the LHC experiments, and a continuation of this program will help ensure that if a groundbreaking discovery awaits us in the LHC data, it will not be missed. Finally, if there is a discovery, I will develop methods to characterize it with new measurements at the LHC. In addition, I will also build models to describe the new physics and put it in the context of the SM as well as well-motivated theories that go beyond the SM. Any discovery will lead to a new insight into the workings of our universe, but it will also lead to many mysteries, and I will work towards developing techniques that allow us to gain a deeper understanding of nature.