Current Commutators and Electromagnetic Mass Differences
- 25 September 1968
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 173 (5) , 1637-1644
- https://doi.org/10.1103/PhysRev.173.1637
Abstract
A version of the Jost-Lehmann-Dyson representation is used to study the forward-spin-averaged "Compton" amplitude constructed from conserved currents. Bjorken's relationship between the divergence in electromagnetic mass shifts and the equal-time commutator of a current density and a time derivative of a current density is clarified and extended to include the case where subtractions in the amplitude are necessary. The connection between equal-time commutators and some features of the radiative corrections to decay are discussed, and some properties of Schwinger terms are developed.
Keywords
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