Hi all,(adsbygoogle = window.adsbygoogle || []).push({});

Can you help me come up with toy field theories to practice calculating cross-sections? I'm not considering theories with derivative couplings like scalar electrodynamics.

The interaction vertices I'm aware of are [itex]\bar{\psi} \gamma^\mu A_\mu \psi[/itex] (QED), [itex]\bar{\psi}\psi\varphi[/itex] (Yukawa), [itex]\bar{\psi}\gamma_5 \psi \varphi[/itex] (pseudoscalar theory), [itex]\bar{\psi}\gamma^\mu B_\mu \gamma_5 \psi[/itex] (axial vector), [itex]\bar{\psi}\psi\varphi^2[/itex] (don't know if this has a name). What are some other creative field theory interactions?

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

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

# Toy field theories

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