MadGraph5_aMC@NLO

Why is the value for aEWM1 in default parameter card so much higher than 1/137 ?

Asked by Ciara Byers

I was comparing a model I'm using to that of a colleague's and noticed that while they have aEWM1 = 1/137, my model has aEWM1 = 1.279000e+02 . Neither of us created the models we're using so we're at a bit of a loss as to why this would be so different. I'm not sure if it's relevant but both are 2HDMs. Could you possibly explain what 's going on please?

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

The default value are hardcoded in each model.
This is the responsibility of the model builder to choose such value.
(and this is the responsibility of the user to choose the value that he wants)
So In general it is difficult for to comment why such model as such value while another as another one. ( It will typically depends of the physics that interest the model builder).

Cheers,

Olivier

> On 16 Aug 2019, at 17:52, Ciara Byers <email address hidden> wrote:
>
> New question #682956 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/682956
>
> I was comparing a model I'm using to that of a colleague's and noticed that while they have aEWM1 = 1/137, my model has aEWM1 = 1.279000e+02 . Neither of us created the models we're using so we're at a bit of a loss as to why this would be so different. I'm not sure if it's relevant but both are 2HDMs. Could you possibly explain what 's going on please?
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

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