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Checking the transverse Ward-Takahashi relation at one loop order in 4-dimensions

M. R. Pennington·R. Williams
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Abstract

Some time ago Takahashi derived so called {\it transverse} relations relating Green's functions of different orders to complement the well-known Ward-Green-Takahashi identities of gauge theories by considering wedge rather than inner products. These transverse relations have the potential to determine the full fermion-boson vertex in terms of the renormalization functions of the fermion propagator. He & Yu have given an indicative proof at one-loop level in 4-dimensions. However, their construct involves the 4th rank Levi-Civita tensor defined only unambiguously in 4-dimensions exactly where the loop integrals diverge. Consequently, here we explicitly check the proposed transverse Ward-Takahashi relation holds at one loop order in $d$-dimensions, with $d=4+ε$.

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M. R. Pennington, R. Williams. 2006-06-30. Checking the transverse Ward-Takahashi relation at one loop order in 4-dimensions. https://doi.org/10.1088/0954-3899%2F32%2F11%2F014

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