I want to find explanations for the parameters in parameters.py, is there somewhere I can look for these specifically?

Asked by Ciara Byers

I want to look up what various parameters in parameters.py are, some are easy to understand what they represent, but some are less obvious (to me at least). For example, I am unsure of what the I1a11 etc parameters are. Is there a file or webpage somewhere that has some verbal explanation of what they all are?

I'm partly interested in this because, to my knowledge, there isn't a 2HDM type-1 model that has tan(beta) and sin(beta - alpha) as parameters that can be edited in the param_card. I was wondering if it would be easier to simply add them in to a pre-existing model, or if I should start from scratch in FeynRules? Or if perhaps taking the 2HDMtII_NLO model and editing that to make it type-1 would be easier since it already has tan(beta) and sin(beta-alpha) implemented?

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Olivier Mattelaer (olivier-mattelaer) said :
#1

Hi,

Feynrules website contains in principle one webpage per model. Otherwise you have to look at the arxiv paper related to the model (often mentioned in the __init__.py file)

> I'm partly interested in this because, to my knowledge, there isn't a 2HDM type-1 model that has tan(beta) and sin(beta - alpha) as parameters that can be edited in the param_card. I was wondering if it would be easier to simply add them in to a pre-existing model, or if I should start from scratch in FeynRules? Or if perhaps taking the 2HDMtII_NLO model and editing that to make it type-1 would be easier since it already has tan(beta) and sin(beta-alpha) implemented?

My bet is that taking a .fr from feynrules website and modify it as you need and then regenerate a UFO model is the easiest path, but since I did use feynrules only once more than 10 years ago... I do not have a clear picture.

cheers,

Olivier

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