Novel phenomenological applications of light-front QCD

光锋 QCD 的新颖唯象应用

• 批准号: SAPIN-2021-00038
• 负责人: Ahmady, Mohammad
• 金额: $ 1.75万
• 依托单位: Mount Allison University
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=762401
• 关键词: Novel; phenomenological; applications; light; front

This research helps with our better understanding of the structure of matter. The bulk of matter is made of quarks, which in the Standard Model (SM) are the fundamental constituents of hadrons like protons and neutrons. Quantum Chromodynamics (QCD) is the widely accepted theory of interactions between quarks which proceeds via the exchange of gluons, the elementary force carriers of the strong force. According to QCD, the attractive force between quarks increases with distance and therefore quarks are confined within bound states with other quarks and antiquarks. Indeed, theoretical calculations based on QCD in long quark distance domain is only possible through numerical simulations and the regular application of the perturbation technique cannot work. Consequently, to get analytical insight into the properties of the bound state of quarks, one has to resort to models for QCD in the strong coupling regime. One such models is based on a duality proposed around two decades ago by Juan Maldacina who showed the mathematical equivalence of a strongly interacting theory in 4-dimensonal space-time to a weakly interacting gravitational theory in a higher dimensional space-time. This model is referred to as light-front holographic QCD. My proposed research is to use this model to make predictions for a wide variety of physical observables which are/will be observed experimentally and compare notes with predictions obtained from other widely used models. Our theoretical predictions are relevant to many experimental facilities around the world like, the BELLE II detector at SuperKEKB Collider (located at KEK, Japan), the Large Hadron Collider (LHC), which its Run III is expected to start in 2021 as well the past experiments at HERA at DESY (located in Germany) and JLab in the US. Through this exercise, we learn how holographic QCD should be augmented when applied to different "flavors" of quarks and at the same time find out the model dependence of our theoretical calculations. The latter is an important piece in testing the SM and looking for signals of new physics and is beyond the domain of SM. This research involves students and contributes to the training of the next generation of Canadian scientist by expanding their knowledge of subatomic physics and elevating their computational skills. In this way, we create opportunities for young researchers to participate in a field that they have previously felt formidable and out of reach.

这项研究有助于我们更好地理解物质的结构。大部分物质是由夸克制成的，在标准模型（SM）中，这是质子和中子等黑龙的基本成分。量子染色体动力学（QCD）是夸克之间相互作用的广泛接受的理论，该理论是通过强力的基本力载体的交换来进行的。根据QCD的说法，夸克之间的吸引力随着距离的增加而增加，因此夸克与其他夸克和古夸克在结合状态中局限于距离。实际上，只有通过数值模拟才有可能基于QCD的理论计算，并且定期应用扰动技术无法工作。因此，为了洞悉夸克的结合状态的特性，必须诉诸于强耦合方案中的QCD模型。一种这样的模型是基于大约两十年前提出的双重性，而胡安·马尔达西纳（Juan Maldacina）在4-二二辅导时空中强烈相互作用理论与较高维度时空中弱相互作用的重力理论的数学等效性。该模型称为光全息QCD。我提出的研究是使用此模型对将通过/将通过实验观察到的各种物理可观察物进行预测，并将注释与从其他广泛使用的模型获得的预测进行比较。我们的理论预测与世界各地的许多实验设施相关，例如Superkekb Collider（位于日本Kek）的Belle II探测器，大型强子对撞机（LHC），其运行III预计将于2021年开始，以及过去在Desy（德国）和美国Jlabab的Hera的实验。通过这项练习，我们了解将全息QCD应用于夸克的不同“风味”时，应如何增强全息QCD，同时了解我们的理论计算的模型依赖性。后者是测试SM并寻找新物理学信号的重要作用，并且超出了SM的领域。 这项研究涉及学生，并通过扩大亚原子物理学知识并提高计算技能来为加拿大科学家的下一代培训做出贡献。通过这种方式，我们为年轻研究人员创造了机会，可以参与他们以前感到巨大而遥不可及的领域。