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Polarization operator for plane-wave background fields

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arxiv 1304.7672 v2 pith:OSV3FLWC submitted 2013-04-29 hep-ph

S. Meuren , C. H. Keitel , A. Di Piazza This is my paper · ORCID
classification hep-ph
keywords backgroundplane-waveexternalfieldoperatorpolarizationrepresentationalternative
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We derive an alternative representation of the leading-order contribution to the polarization operator in strong-field quantum electrodynamics with a plane-wave electromagnetic background field, which is manifestly symmetric with respect to the external photon momenta. Our derivation is based on a direct evaluation of the corresponding Feynman diagram, using the Volkov representation of the dressed fermion propagator. Furthermore, the validity of the Ward-Takahashi identity is shown for general loop diagrams in an external plane-wave background field.

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  1. One loop Volkov propagator in the Lorentz class of gauges

    hep-ph 2019-08 conditional novelty 5.0 of 10

    The one-loop correction to the laser-induced mass shift in QED is gauge dependent, vanishing in Landau gauge where only vacuum renormalisation is needed.

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