Hi I am studying qft with worldwidely used text, written by Peskin and Schroeder, An introduction to qft. I have trouble with the calculation of thr numerator on pp. 192. I got additional term ## 2m(z-xy)(mγ^μ - p^μ) ## between spinors, which seems not vanishing. Is there any idea to treat this problem? Thanks in advance(adsbygoogle = window.adsbygoogle || []).push({});

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# (Peskin and Schroeder) Numerator of vertex correction

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