Integral Representations for Vertex Functions
Journal Article
·
· Journal of Mathematical Physics
The third-order Feynman graph is studied as a function of the three external masses squared for arbitrary real values of the internal masses. Single and double dispersion relations are derived that, for arbitrary real values of the undispersed variables, involve integrations only over real contours. Spectral functions for both the singie and double integral formulas are listed. In several cases, a non-Jandau singulaiity (on the forward scattering curve) appears on the physical sheet, but not as a singularity of the physical boundary value.
- Research Organization:
- Univ. of California, Los Angeles
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-007488
- OSTI ID:
- 4113750
- Journal Information:
- Journal of Mathematical Physics, Journal Name: Journal of Mathematical Physics Journal Issue: 1 Vol. 5; ISSN JMAPAQ; ISSN 0022-2488
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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