Explicit Calculations of the Vertex Funcion
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چکیده
Let us work on the numerator. The aim is to rewrite it as a linear combination of γ piece, iσqν piece and q μ piece. The reason is the following. It is only γ piece which receives the wave function renormalization at this order, as we will see later. Therefore, iσqν piece is finite by itself. Furthermore, this is the piece which generates the anomalous magnetic moment, and hence it is useful to separate them from the physics point of view as well. We will benefit from the fact that the δΓ is sandwiched between ū(p′) and u(p).
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