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I need some help for problem 5.6 (b) in Peskin + Schroeder QFT. I can't get rid of the term including three gamma matrices in my amplitude.

I get two terms of the form:

\frac{-\gamma^{\nu}*\slash{k_2}*\gamma^{\mu} + 2\gamma^{\nu}p_1^{\mu}}{-2*p_1*k_2}

and the same with k_1 <-> k_2 and \nu <-> \mu.

How can I evaluate the first term in the numerator using the Fierz identiy from 5.3?

Thanks in advance!!

Philip

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# Peskin & Schroeder QFT 5.6 Need help!

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