# Derivating a Yukawa theory loop-integral !

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 P: 6 Hello fellow physicists, during some calculations for a project regarding Renormalization, I had a difficulty in computing a derivative of a loop integral in Yukawa theory. The thing i'm reffering to can be found in Peskin and Schroeder's book, Introduction to QFT , in Chapter 10 page 329-330. Question #1: How the gamma function's argument changes from "1-d/2" (10.33) to "2-d/2" (10.35) ? Question #2: Could please somebody show me a detailed calculation of the derivation? I cannot get the finel form, with "x(1-x)" in the numerator and plus the denominator has power "2-d/2" and i think that normally the power should be "-d/2" Thank you very much in advance..
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 Quote by Ace10 How the gamma function's argument changes from "1-d/2" (10.33) to "2-d/2" (10.35) ?
When you take the derivative of the denominator, a factor of 1-d/2 comes out, and then use the identity zΓ(z) = Γ(z+1).

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