Propagating EFT model into decays via MadSpin
Hi,
I am trying to 'generate p p > t t~ h FCNC=0 DIM6=1' using the dim6top model. I want to decay both tops and the Higgs, I also want to do an EFT insertion into the decays. In MadSpin I do for example 'decay t > w+ b DIM6=1, w+ > all all', I also do 'decay h > all all DIM6=1' (I am not sure if that latter makes sense). I don't set the decay width in the param_card.dat to 'auto'. The following didn't change when I used 'auto', it just took a huge amount of running time to produce the same thing.
I expected MadSpin to recalculate the widths of the tops and the Higgs according to the EFT model, and thus will get different BR and total widths than what I get when I don't use DIM6=1. However, that doesn't seem to be the case, i.e. whether I put DIM6=1 or not, the width and the BR are the same. I have a couple of questions please:
1) Is what I am observing expected? If so, how? Or there is something I am missing here?
2) In this case, I am doing one EFT insertion in the production and another one in the decay. How do I make sure that the EFT insertion is either in the production OR the decay but not both, i.e. avoid double insertions?
Your help is much appreciated.
Best,
Hesham
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