# Weinberg, Vol. 1: Path Integrals Query

1. Nov 29, 2007

### Reggaerules

I am trying to study QFT from Weinberg's Vol. 1.

I am at the moment stuck at the path integral quantization of QED (Weinberg's treatment).

I am not sure how he integrates out the matter field momenta (for the spinor field) in eq. (9.6.5). I thought for spinor fields you don't do that.

I thought that there should be integration with respect to p_m as given in eq. (9.5.56).

Any help will be much appreciated.

2. Dec 3, 2007

### Avodyne

I think he just didn't bother to write $d\psi^\dagger$. This is essentially a matter of convention as to whether we think of $\psi^\dagger$ as an independent field or not.

3. Dec 3, 2007

### Reggaerules

QFT: Path Integrals, Weinberg Vol. 1