SINGULARITIES OF FEYNMAN AMPLITUDES
Journal Article
·
· Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B
The analytic properties of perturbation theory amplitudes written as integrals over internal invariants are discussed. Single-loop amplitudes are considered and a condition, equivalent to the positive alpha condition, is derived for singularity in the physical limit. Some simple double-loop diagrams are discussed also and the existence and nature of a certain mixed second-type singularity is investigated. A feature of these latter diagrams is the necessity of dealing with spurious singularities. The relevance of these considerations to certain three-particle phase-space integrals is pointed out. (auth)
- Research Organization:
- Cambridge Univ., Eng.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-042175
- OSTI ID:
- 4683475
- Journal Information:
- Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B, Journal Name: Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B Vol. Vol: (10), 29; ISSN NUCIA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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