Hi, this is probably very simple but what is the difference between these two Feynman propagators:(adsbygoogle = window.adsbygoogle || []).push({});

[tex] \frac{i}{q^2-m^2}[/tex]

[tex] \frac{i(p/+m)}{p^2-m^2}[/tex]

E.g. Is one used for the invariant amplitude and the other for loop integrals? Or is one for a fermion and the other for a boson? =s

Thanks!

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Feynman Propagators

**Physics Forums | Science Articles, Homework Help, Discussion**