MadGraph5_aMC@NLO

SMEFT LO&NLO modules

Asked by Christian

Hello,

so I am trying out some SMEFT models.
The problem is that I can't find one which does fixed order calculations. And some only work for LO and some only for NLO.
InvalidCmd : The model SMEFTsim_U35_MwScheme_UFO cannot handle loop processes
Is there a SMEFT Module, which includes fixed LO and NLO calculations? I want to extract the differential distributions from the HwU file for my python program.

Best regards,

Christian

The error Code for the only NLO SMEFT I have found was this:
Defined multiparticle all = g ghg ghg~ u c d s b u~ c~ d~ s~ b~ a gha gha~ ve vm vt e- mu- ta- ve~ vm~ vt~ e+ mu+ ta+ t t~ z w+ ghz ghwp ghwm h w- ghz~ ghwp~ ghwm~
MG5_aMC>generate p p > t t∼ NP=2 [QCD]
Command "generate p p > t t∼ NP=2 [QCD]" interrupted with error:
InvalidCmd : model order NP not valid for this model (valid one are: QED, QCD, EW, EW^2, aEW, aS). Please correct

The thing is that I simply followed the first step of the instructions.
https://indico.cern.ch/event/941711/contributions/4020203/attachments/2119387/3566489/Mimasu_LHCEWWG.pdf

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Olivier Mattelaer
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Best Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi Christian,

I personally do not know all the UFO model available in the litterature.
For SMEFT model, the two big type of model used with MG5aMC@NLO are those develloped by SMEFTsim group (which I believed are only LO accurate) and those develloped by the SMEFTatNLO group (which support both LO, NLO and loop-induced computation)

The link that you want to follow is indeed from one of the author of SMEFTatNLO model. So you likely want to use one of their models.

Cheers,

Olivier

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Christian (chris0990) said : 		#2

Thanks Olivier Mattelaer, that solved my question.