隐士
发表于 2025-3-23 12:23:43
https://doi.org/10.1007/978-3-031-18258-7Scattering Matrix; Feynman integrals; QFT and Causality; Anomalous thresholds; Landau equation; Schwinger
能够支付
发表于 2025-3-23 15:14:02
http://reply.papertrans.cn/103/10279/1027822/1027822_12.png
集合
发表于 2025-3-23 19:23:12
Conclusion,This chapter concludes the book with a summary of the results and a list of open questions.
混合
发表于 2025-3-24 02:06:48
Holmfridur Sigridar Hannesdottir,Sebastian MizeraProvides a pedagogical introduction to the analytic properties of the S-matrix.Reviews the rich literature on singularities of scattering amplitudes.Presents a new prescription for analytically contin
Ischemic-Stroke
发表于 2025-3-24 03:12:45
Unitarity Implies Anomalous Thresholds, the analytic structure of the cuts. We discuss the implications of the cutting rules when unstable particles are involved in the scattering process: we derive how to cut through dressed propagators, and show that cuts through undressed propagators for unstable particles resum to zero.
悠然
发表于 2025-3-24 07:04:31
Primer on the Analytic S-matrix,elop intuition and illustrate the key points relevant for general multi-loop diagrams. Throughout this chapter, we point out which facets of the analysis generalize straightforwardly and which are more intricate.
BAIT
发表于 2025-3-24 12:32:14
http://reply.papertrans.cn/103/10279/1027822/1027822_17.png
Intrepid
发表于 2025-3-24 17:46:59
Branch Cut Deformations,cuts can be deformed away to restore the connection between the upper- and lower-half planes, and one when they cannot. Finally, we explain how summing over different Feynman diagrams might result in incompatible . prescriptions and one is forced to consider branch cut deformations to define the complexified amplitude in the first place.
peptic-ulcer
发表于 2025-3-24 19:30:57
,Glimpse at Generalized Dispersion Relations, any . scattering process. We find two types of identities: the first relates the scattering amplitude to an integral over its discontinuity, while the second relates parts of the scattering amplitude to an integral over its imaginary part.
–DOX
发表于 2025-3-25 02:22:51
http://reply.papertrans.cn/103/10279/1027822/1027822_20.png