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This is regarding showing, in ch.7, around p.220, that the Pauli Vilars regularization technique is consistent with the ward takahashi identity.

I cannot get the following to work:

I add eq. 7.31 to eq. 7.32 and do not get zero. I get alpha over 4 pi.

(I am left with integral ( 1 - z) * alpha over 2 pi )

we are supposed to show it is zero. i ve checked it and some of the preceding results a few times but cannot get it.

what am i missing. can anyone confirm the problem?

Id really appreciate it! its making me a little nuts.

thanks!

simic

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# QFT Peskin Errata

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