# Peskin QFT, problem 10.3

1. Mar 28, 2005

### phinlamp

Hi,

I'm stuck with problem 10.3 from Peskin's QFT book. I'm trying to evaluate the 2-loop sunset diagram in massless phi^4 theory however I keep running into trouble. I'm trying to use standard feynman parameter + dimensional regularisation techniques however i keep getting stuck when it comes to integrating over the 2nd loop.

Can anyone help me?

Phin

2. Mar 29, 2005

### dextercioby

How about you post the integral which gives u headaches...?Do u use a generalized zeta Riemann regularization...?

Daniel.

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