Precision tests of the standard model and properties of hadrons in the effective field theories

有效场论中强子标准模型和性质的精度测试

• 批准号: 355450-2011
• 负责人: Aleksejevs, Aleksandrs
• 金额: $ 1.09万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=572576
• 关键词: Precision; tests; standard; model; properties

Investigation on the origin, evolution and structure of strongly interacting (hadronic) matter requires both experimental and theoretical effort. Chiral Perturbation Theory has been tremendously successful in describing low-energy hadronic interactions in the non-perturbative regime of Quantum Chromodynamics. The main purpose of our theoretical research is to take advantage of the new symbolic computing methods and to bring subatomic physics computations to the next level by developing a computational model with a consistent power counting scheme within relativistic Chiral Perturbation Theory. Our recently developed Computational Hadronic Model already incorporates the octet of baryons, pseudoscalar mesons, and decuplet of resonances, and first we plan to expand it with vector meson sector. After that, we will apply our new models, starting with the calculations of the electromagnetic nucleon formfactors using all of the possible degrees of freedoms of the effective chiral theory of strong interactions. The next application will be directed to virtual Compton scattering which will provide broader understanding of the dynamical structure of the baryons. Our new Computational Hadronic Model, supplemented by the vector meson sector, can also be applied to the studies of the impact of the hadronic radiative corrections on the parity violating lepton-nucleon scattering and hence dramatically improve precision in the tests of Standard Model. In the most general sense, we will develop and use the advanced symbolic computational methods to study various reactions in hadronic physics with a high degree of precision. Although any practical outcomes of basic research such as a subatomic theory cannot be predicted immediately, such basic research is pushing the frontiers of human knowledge, and will eventually lay the foundations for new technologies.

对强相互作用（强子）物质的起源、演化和结构的研究需要实验和理论两方面的努力。手征微扰理论在描述量子色动力学非微扰区的低能强子相互作用方面取得了巨大的成功。我们的理论研究的主要目的是利用新的符号计算方法，并通过在相对论手征微扰理论中开发具有一致功率计数方案的计算模型，将亚原子物理计算带到下一个水平。 我们最近发展的计算强子模型已经包含了重子八重态、赝标介子和共振十重态，首先我们计划用矢量介子扇区来扩展它。在那之后，我们将应用我们的新模型，从使用强相互作用的有效手征理论的所有可能的自由度计算电磁核子形状因子开始。下一个应用将是针对虚拟康普顿散射，这将提供更广泛的理解的动力学结构的重子。我们的新计算强子模型，加上矢量介子扇形，也可以用来研究强子辐射修正对宇称违反轻子-核子散射的影响，从而大大提高标准模型检验的精度。 在最一般的意义上，我们将发展和使用先进的符号计算方法来研究强子物理中的各种反应，并具有高度的精度。虽然亚原子理论等基础研究的实际成果无法立即预测，但这些基础研究正在推动人类知识的前沿，并最终为新技术奠定基础。