Origin of mass scales and hierarchies

质量尺度和等级制度的起源

• 批准号: SAPIN-2015-00035
• 负责人: Holdom, Bob
• 金额: $ 4.95万
• 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=691440
• 关键词: Origin; mass; scales; hierarchies

The news in particle physics the last few years has been dominated by discovery of the Higgs boson. This discovery completes the standard model and the origin of mass of all other particles can now be attributed to the Higgs mechanism. The impression may then be that the field is in a state of resolution and understanding, but in fact this is far from the case. An understanding of the Higgs mass itself is still lacking and the origin of the Higgs couplings to fermions is still unknown. In particular the observed value of the Higgs mass is deeply unnatural given the rules of quantum field theory. The lack of evidence for any other new physics at Run 1 at the LHC makes this conundrum especially severe. We propose to study two possibilities, with the expectation that Run 2 will decide which, if either, is close to reality. The first is that the Higgs description breaks down within the energy range of Run 2 at the LHC. I have and will continue to develop this type of theory and the predictions it makes. It implies an exciting time for experimental and theoretical physics as the new physics of the TeV scale unfolds. The second possibility is that evidence continues to build for an elementary Higgs boson. The theoretical implications in this case are far reaching and will require us to tightly constrain the theory up to extremely high energies. This is because of the sensitivity of the Higgs mass to all higher mass scales, including that of gravity. The problem of the Higgs mass is similar in some respects to the problem of dark energy in cosmology, and we view these problems as valuable clues to the quantum theory of gravity.**

过去几年粒子物理学的新闻主要是希格斯玻色子的发现。这一发现完善了标准模型，所有其他粒子的质量起源现在都可以归因于希格斯机制。给人的印象可能是该领域处于解决和理解的状态，但事实上情况远非如此。对希格斯质量本身的了解仍然缺乏，希格斯与费米子耦合的起源仍然未知。特别是，考虑到量子场论的规则，希格斯质量的观测值是非常不自然的。大型强子对撞机的第一轮实验缺乏任何其他新物理学的证据，这使得这个难题变得尤为严重。我们建议研究两种可能性，期望运行 2 将决定哪一种（如果有的话）更接近现实。首先，希格斯粒子的描述在大型强子对撞机运行 2 的能量范围内被打破。我已经并将继续发展这种类型的理论及其做出的预测。随着 TeV 尺度新物理学的展开，这对于实验和理论物理学来说意味着一个激动人心的时刻。第二种可能性是基本希格斯玻色子的证据仍在不断增加。这种情况的理论意义是深远的，需要我们将理论严格限制在极高的能量范围内。这是因为希格斯质量对所有更高质量尺度（包括重力）的敏感性。希格斯质量问题在某些方面与宇宙学中的暗能量问题相似，我们将这些问题视为量子引力理论的宝贵线索。**