ON THE DESCRIPTION OF UNSTABLE PARTICLES IN QUANTUM FIELD THEORY. Technical Note No. 13
Technical Report
·
OSTI ID:4262738
The mass and life time of an unstable particle may be defined by the real and imaginary parts of a complex pole appearing on the Riemann surface in which its propagator can be continued analytically. This methods which was originally proposed by Peierlss is studied in details first on the basis of a special models then in a more general field theory. The possibility of analytical continuation of the propagator is discusseds using the conditions of causality and unitarity of the S-matrix. The appearance of "unphysical" poles in the various sheets of the Riemann surfacc is also discussed. lt is inferred that a physical principle must be used in each cases in order to select the particular pole which can be correctly interpreted as describing the propertics of an unstable particle. (auth)
- Research Organization:
- Paris. Universite. Ecole Normale Superieure
- NSA Number:
- NSA-13-013929
- OSTI ID:
- 4262738
- Report Number(s):
- AFOSR-TN-59-417; AD-214564
- Country of Publication:
- United States
- Language:
- English
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