Hi Florian,

I have two problems in writing a new 331 model.

First, suppose that Q=T3+beta*T8+x*I, where x is the U(1) charge,
the two models implemented in SARAH program, the 331v1 and 331v2 models, have different conventions in choosing beta. The first is -1/sqrt(3), and the second is sqrt(3).
How does SARAH decide the value of beta?

Second, my new 331 model, where beta equals to -1/sqrt(3), has no solution when I make spheno, but there is a solution if I solve the tadpole equations in notebook(please refer to 331tadpole.m).

Please refer to the attachment.


Best~
Wenxing

Hi,

1) I'm not the author of these models. Therefore, it would be better if you contact Avelino who has implemented them (just send him a link to this thread)
2) The reason might be the loop corrections. See for instance the discussion here: http://stauby.de/sarah_userforum/viewto ... 1loop#p982

Cheers,
Florian

Hi Florian,

After I add
Tad1Loop[x_Integer]:=0; after ParametersToSolveTadpoles, the problem doesn't solved.

It seems that it's not a problem of 1-loop calculation.

Best~
Wenxing

Hi,

I just see that you only consider three equations in your file: However, your model has four VEVs and SARAH needs to solve all equations. Thus, you will also need four free parameters.

Cheers,
Florian

Hi Florian,

I have only 3 vevs, because the last one has been commented.
Look forward to your reply.

Thanks very much!

Best~
Wenxing