Hi

I am creating a model file for a model given in

https://arxiv.org/pdf/1512.01560.pdf

I was a little confused how to implement a coupling like 2.1 since it has a gamma matrix in the coupling. None of the other models seem to have a coupling like this. How do I implement this

kind regards
Graham

Hi,

yes, this is tricky and (officially) not possible so far: SARAH associates vector boson always with a gauge group. Thus, for the implementation of such a model one needs to define the SU(4) gauge group and break it down to SU(3). Actually, I'm working at the moment on an extension to support unbroken subgroups of a larger gauge group as needed for exactly this example. I can't promise so far any date, when this will be released.

Cheers,
Florian