the meaning of feynman diagrams of SMEFTatNLO

Asked by Yingjie Wei on 2021-04-27

Hi experts:

     These days, I am using the model SMEFTatNLO-NLO to draw some Feynman diagrams and extract Wilson coefficients.

here is my command in Madgraph:

```
import model SMEFTatNLO-NLO
generate g g > z z QCD=2 QED=2 NP=2 NP^2==2 [noborn=QCD]
```

Then I got 132 diagrams here: https://cernbox.cern.ch/index.php/s/mW5Vpmjur1nsHRq

Is there a way to find out which diagram is corresponding to Operator cpt or ctp or something else?

I also found Diagram 57 and Diagram 59 are identical. I think there is something different on them, right?

That's really appreciated!

Cheers,
Yingjie

Question information

Language:
English Edit question
Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Last query:
Last reply:

> Is there a way to find out which diagram is corresponding to Operator cpt or ctp or something else?

The easiest is to modify the model to add additional coupling order such that such information will be displayed.
Otherwise this is quite complex.

> I think there is something different on them, right?

Yes, likely a different lorentz structure or coupling.

Cheers,

Olivier
> On 27 Apr 2021, at 10:30, Yingjie Wei <email address hidden> wrote:
>
> New question #696779 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/696779
>
> Hi experts:
>
> These days, I am using the model SMEFTatNLO-NLO to draw some Feynman diagrams and extract Wilson coefficients.
>
> here is my command in Madgraph:
>
> ```
> import model SMEFTatNLO-NLO
> generate g g > z z QCD=2 QED=2 NP=2 NP^2==2 [noborn=QCD]
> ```
>
> Then I got 132 diagrams here: https://cernbox.cern.ch/index.php/s/mW5Vpmjur1nsHRq
>
> Is there a way to find out which diagram is corresponding to Operator cpt or ctp or something else?
>
> I also found Diagram 57 and Diagram 59 are identical. I think there is something different on them, right?
>
> That's really appreciated!
>
> Cheers,
> Yingjie
>
>
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Can you help with this problem?

Provide an answer of your own, or ask Yingjie Wei for more information if necessary.

To post a message you must log in.