SM at NLO

Asked by Abdellah Tnourji on 2020-11-19

Hello,

Sorry if this is a very naive question :

I would like to generate pure SM at NLO ( for ttbar pair ), so I do something like :

import model loop_sm

generate p p > t t~ [QCD]

# ---------------------------
In madspin
# --------------------------
decay t > w+ b, w+ > l+ vl
decay t~ > w- b~, w- > l- vl~
decay w+ > l+ vl
decay w- > l- vl~
# ---------------------------

Am I importing the right model and generating the process correctly?

Thanks a lot!

Cheers,
A.Tnourji

Question information

Language:
English Edit question
Status:
Open
For:
MadGraph5_aMC@NLO Edit question
Assignee:
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Last query:
2020-11-20
Last reply:
2020-11-19

This question was reopened

What do you mean by "pure"

Your syntax does NLO QCD.

But the decay with MadSpin is LO accurate.
The line
> decay w+ > l+ vl
> decay w- > l- vl~
are not needed but does not hurts either

Cheers,

Olivier
> On 19 Nov 2020, at 15:15, Abdellah Tnourji <email address hidden> wrote:
>
> New question #694088 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/694088
>
> Hello,
>
> Sorry if this is a very naive question :
>
> I would like to generate pure SM at NLO ( for ttbar pair ), so I do something like :
>
> import model loop_sm
>
> generate p p > t t~ [QCD]
>
>
> # ---------------------------
> In madspin
> # --------------------------
> decay t > w+ b, w+ > l+ vl
> decay t~ > w- b~, w- > l- vl~
> decay w+ > l+ vl
> decay w- > l- vl~
> # ---------------------------
>
>
> Am I importing the right model and generating the process correctly?
>
> Thanks a lot!
>
> Cheers,
> A.Tnourji
>
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Abdellah Tnourji (atnourji) said : #2

Hello,

What do you mean by "pure"

Just SM.

Thank you, I consider this as solved
Cheers,

Abdellah Tnourji (atnourji) said : #3

Hello,

I have another question regarding this comment :

But the decay with MadSpin is LO accurate.
The line
> decay w+ > l+ vl
> decay w- > l- vl~
are not needed but does not hurts either

I want to do smothing like
generate p p > t t~ QED=0 QCD=2 NP=2 [QCD]
decay t > w+ b
decay t~ > w- b~

But at NLO decay ? is it possible with madspin ?
Many thanks.

Cheers,
A.Tnourji

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