When I referred to unitarity I meant that in the Fermi theory there are cross sections that grow with the energy.
For example:
\sigma(e \nu \rightarrow e \nu) \propto {G_F}^2 s
Since cross sections express the likelihood of interaction between particles, what happens is that at...
Hello,
I don't understand why pi0-pi0 can't have J=1.
I thought (probably wrong) that they could have some relative angular momentum L for example L=1 so that then pi0-pi0 would have J=1.
Maybe it's trivial but could someone please explain me why that isn't possible :)
Thank you!