- #1
Rick89
- 47
- 0
Hi, I am having this problem learning interacting fields. In scalar Yukawa theory, two scalar fields (one real call meson phi, one complex call nucleon psi) (interaction term psi-dagger*psi*phi) why can't we write at first order in the interaction an amplitude from a single meson state to vac. (I know it does not make sense, but I don't understand why coming from the formalism) like:
<0| c*c-dagger*a|meson>
where c destroys anti-nucleon, and a destroys meson. Isn't this a term in psi-dagger*psi*phi, when expanded in normal modes? Thanx alot
<0| c*c-dagger*a|meson>
where c destroys anti-nucleon, and a destroys meson. Isn't this a term in psi-dagger*psi*phi, when expanded in normal modes? Thanx alot