scholarly journals Two-loop corrections to the electromagnetic vertex for energies close to threshold

1997 ◽  
Vol 56 (11) ◽  
pp. 7276-7283 ◽  
Author(s):  
A. H. Hoang
Keyword(s):  
Electromagnetic Vertex

scholarly journals One-loop nonbirefringent effects on the electromagnetic vertex in the Standard Model Extension

2014 ◽  
Vol 29 (22) ◽  
pp. 1450107 ◽  
Author(s):  
A. Moyotl ◽  
H. Novales-Sanchez ◽  
J. J. Toscano ◽  
E. S. Tututi
Keyword(s):  
Standard Model ◽  
Lorentz Invariance ◽  
Lorentz Violation ◽  
Tree Level ◽  
Isotropic Case ◽  
Photon Propagator ◽  
Standard Model Extension ◽  
Model Extension ◽  
The One ◽  
Electromagnetic Vertex

Lorentz violation emerged from a fundamental description of nature may impact, at low energies, the Maxwell sector, so that contributions from such new physics to the electromagnetic vertex would be induced. Particularly, nonbirefringent CPT-even effects from the electromagnetic sector modified by the Lorentz- and CPT-violating Standard Model Extension alter the structure of the free photon propagator. We calculate Lorentz-violating contributions to the electromagnetic vertex, at the one-loop level, by using a modified photon propagator carrying this sort of effects. We take the photon off shell, and find an expression that involves both isotropic and anisotropic effects of nonbirefringent violation of Lorentz invariance. Our analysis of the one-loop vertex function includes gauge invariance, transformation properties under C, P and T, and tree-level contributions from Lorentz-violating nonrenormalizable interactions. These elements add to previous studies of the one-loop contributions to the electromagnetic vertex in the context of Lorentz violation in the photon sector. Finally, we restrict our analysis to the isotropic case and derive a finite contribution from isotropic Lorentz violation to the anomalous magnetic moment of fermions that coincides with the result already reported in the literature.

scholarly journals Electromagnetic vertex function of the pion at T>0

2006 ◽  
Vol 48 (2) ◽  
pp. 589-596
Author(s):  
J. van der Heide ◽  
E. Laermann ◽  
J.H. Koch
Keyword(s):  
Vertex Function ◽  
Electromagnetic Vertex

scholarly journals Boson Electromagnetic Vertex Function in the Veneziano Model

1970 ◽  
Vol 44 (5) ◽  
pp. 1312-1316 ◽  
Author(s):  
Mikio Namiki ◽  
Ichiro Ohba
Keyword(s):  
Vertex Function ◽  
Veneziano Model ◽  
Electromagnetic Vertex
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