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CAS Key Laboratory of Theoretical Physics |
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Institute of Theoretical Physics |
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Chinese Academy of Sciences |
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Seminar |
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Title
题目 |
The power of EFT: Deriving the electroweak Standard Model |
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Speaker
报告人 |
Prof. Ulf-G. Meissner
中国科学院国际人才计划国际杰出学者 |
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Affiliation
所在单位 |
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University of Bonn / Jülich Research Center | |
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Date
日期 |
2018年9月4日（周二）上午10:00 |
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Venue
地点 |
Conference Room 322, ITP main building |
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Abstract
摘要 |
In this talk, I revisit the problem of deriving local gauge invariance with spontaneous symmetry breaking in the context of an effective field theory. Previous derivations were based on the condition of tree-order unitarity. However, the modern point of view considers the Standard Model as the leading order approximation to an effective field theory. As tree-order unitarity is in any case violated by higher-order terms in an effective field theory, it is instructive to investigate a formalism which can be also applied to analyze higher-order interactions. I consider an effective field theory of massive vector bosons interacting with a massive scalar field. The conditions of generating the right number of constraints for systems with spin-one particles and perturbative renormalizability as well as the separation of scales at one-loop order are imposed. These conditions imply severe restrictions on the coupling constants of the interaction terms. Except for the strengths of the self-interactions of the scalar field, that can not be determined at this order from the analysis of three- and four-point functions, one recovers the gauge-invariant Lagrangian with spontaneous symmetry breaking in the unitary gauge as the leading order approximation to an effective field theory. I also outline the additional work that is required to finish this program. |
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Contact person
所内联系人 |
郭奉坤 |
