SMEFTatNLO event generation ctG @ NP^2==4

Asked by Rahul Balasubramanian

Dear Madgraph Experts,

     We are interested in generating the contribution of ctG at O(1/Lambda^4) for gluon-gluon
     fusion production of Higgs in the SMEFTatNLO model and to this extent we do the following,

     import SMEFTatNLO_U2_2_U3_3_cG_4F_LO_UFO-NLO_ctG
     define jb = j b b~

     generate p p > h [noborn=QCD] QED = 1 NP^2==4 NP<=2 @0
     generate p p > h jb [noborn=QCD] QED = 1 NP^2==4 NP<=2 @1
     generate p p > h jb jb [noborn=QCD] QED = 1 NP^2==4 NP<=2 @2

     output out_ctG_NPsq4

We load the model with the following restrict card [0] After the output step we face an error after
providing output out_ctG_NPsq4. We have added the MG5_debug here [1]. Kindly let us know if we are
missing some detail with regards to this generation.

Ana, Saskia, and Rahul

[0] -

[1] -

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English Edit question
MadGraph5_aMC@NLO Edit question
Valentin Hirschi Edit question
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Saskia Falke (sfalke) said :

Dear experts,

might we ask again for your help on that issue? We are still struggling with this missing piece for generating the samples we need.


Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said :

HI Valentin,

This is for you, this is a clear bug in the output of madloop related to the leading color of the loop.



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Rahul Balasubramanian (rbalasub) said :

Dear experts,

     We have attempted using a more recent MG versions (2.7.2, 2.7.3)
 to see if the issue could be resolved however we still seems to
encounter it. Kindly let us know if there something else we could try.


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