期刊
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
卷 55, 期 44, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1751-8121/ac8254
关键词
scattering amplitudes; quantum field theory; gravity
资金
- European Union [764850]
- Science and Technology Facilities Council (STFC) [ST/T000686/1]
Scattering amplitudes are important concepts and techniques in quantum field theory. This chapter introduces foundational concepts and techniques, aiming to make readers understand and apply this knowledge.
This chapter introduces the foundational concepts and techniques for scattering amplitudes. It is meant to be accessible to readers with only a basic understanding of quantum field theory. Topics covered include: the four-dimensional spinor-helicity formalism and the colour decomposition of Yang-Mills scattering amplitudes; the study of soft and collinear limits of Yang-Mills and gravity amplitudes; the BCFW recursion relation and generalised unitarity, also in the superamplitudes formalism of N = 4 supersymmetric Yang-Mills; an overview of standard and hidden symmetries of the S-matrix of N = 4 super symmetric Yang-Mills, such as the conformal, dual conformal and Yangian symmetries; and a brief excursus on form factors of protected and non-protected operators in Yang-Mills theory. Several examples and explicit calculations are also provided.
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