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High Energy Physics - Phenomenology, hep-ph
Abstract:
We derive an alternative representation of the leading-order contribution to
the polarization operator in strong-field QED 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.
