running parameters except alpha_s

Hi Jian,

This is actually something which we do not officially support.

If you do a fix scale computation then indeed the easiest way is to modify the value of kappa in the param_card.
If you prefer to do a dynamical scale, then you need to modify/duplicate the running that we have for alpha_s in order
to do the same for kappa.

Cheers,

Olivier

On 23 Feb 2015, at 10:56, jianwang <email address hidden> wrote:

> New question #262652 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/262652
>
> Hi MG team,
> I have added a new interaction term Oq=S qbar.q (S a new scalar) with a coefficient parameter kappa, i.e., kappa*Oq.
> At NLO in QCD, kappa is renormalized in MSbar scheme. As a result, it depends on the renormalization scale muR.
> In the param_card.dat, I set kappa=1. In the run_card.dat, I set muR=91.1876 GeV for a running.
> Does it mean that kappa(91.1876)=1 ?
>
> If I set muR=200 GeV for another running, do I need to change the value of the parameter kappa in param_card.dat ?
>
> How can I use a dynamical scale for this parameter kappa ?
>
> Thank you very much.
>
> Jian
>
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