Squared coupling orders and MadSpin

Asked by Hannes on 2020-02-11

Hi,

we are trying to generate a BSM sample using squared coupling constraints, for example
'p p > j j w+ w $ t t~ NP^2==1'
and would then like to decay the bosons using MadSpin.

Our understanding is that this might result in the correct physics, as the new-physics coupling only affects the quartic gauge coupling but not the decay. This approach does not work out of the box with MadGraph (we encountered an error: "Decay processes cannot specify squared orders constraints") but we found a workaround from question 255413, one can make it run if the NP^2 is simply removed from the LHE file before MadSpin is run.

Are we right to expect this gives reasonable results or is there something we are missing?

Cheers,
Hannes

Question information

Language:
English Edit question
Status:
Answered
For:
MadGraph5_aMC@NLO Edit question
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Last query:
2020-02-11
Last reply:
2020-02-11

Hi,

Well the True is that no one can really predict what can happen here...
I believe that the result should be reasonable but this certainly requires validation.
Not sure that you can really claim full-spin correlation/...

Cheers,

Olivier

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