ON THE DESCRIPTION OF UNSTABLE PARTICLES IN QUANTUM FIELD THEORY
Journal Article
·
· Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B
The mass and life time of an unstable particle may be defined by the real and imaginary parts of a complex pole appearing on ihe Riemann surface in which its propagator can be continued analytically. This method, which was orginally proposed by Peierls, is studied in detail, first on the basis of a special model, then in a more general field theory. The possibiliiy of analytical continuation of the propagator is discussed, using the conditions of causality and unitarity of the S-matrix. The appearance of unphysical poles in the various sheets of the Riemann surface is also discussed. It is inferred that a physical principle must be used in each case, in order to select the particular pole which can be correctly interpreted as describing the properties of an unstable particle. (auth)
- Research Organization:
- Universite, Paris
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-13-020400
- OSTI ID:
- 4245132
- 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) 13; ISSN NUCIA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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