regarding QCD corrections in SMEFT file

Asked by Disha Bhatia

Hello I am using a SMEFT model to perform one loop QCD correction for the p p > w w process. This works well for SM now however gives me an error when I try to include one SMEFT effects.

I get this error: MG5_aMC>import model SMEFTd6_NLOQCD_v3-full --modelname
Kept definitions of multiparticles p / j / l+ / l- / vl / vl~ unchanged
Defined multiparticle all = g ghg ghg u c d s u c d s a gha gha ve vm vt e- mu- ve vm vt e+ mu+ t b t b z w+ ghz ghwp ghwm h w- ghz ghwp ghwm ta- ta+
MG5_aMC>generate p p > w+ w- [QCD]
Setting the born squared orders automatically in the process definition to QED^2<=4 QCD=0 QEFT=0.
If this is not what you need, please regenerate with the correct orders.
WARNING: Use of multiparticles is non-trivial for NLO process generation and depends on the orders included, the process considered, as well as the PDF set chosen. See appendix D of arXiv:1804.10017 [hep-ph] for some guidance.
INFO: Generating FKS-subtracted matrix elements for born process: u u~ > w+ w- QCD^2=2 QED^2=4 QEFT^2=0 (1 / 16)
Command "generate p p > w+ w- [QCD]" interrupted with error:
FKSProcessError : Only QCD or QED is allowed not QEFT
Please report this bug on https://bugs.launchpad.net/mg5amcnlo
More information is found in 'MG5_debug'.
Please attach this file to your report.

I am using MG5_aMC_v3_5_4 version of madgraph. Can you please let me know regarding what could be the source of error. It will be very helpful.

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Disha Bhatia
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Revision history for this message
Disha Bhatia (dishabhatia1989) said :
#1

This code works well with people using madgraph version 2, however I am using python 3 and am unable to run this process with madgraph version 2

Revision history for this message
Disha Bhatia (dishabhatia1989) said :
#2

This code works well with people using madgraph version 2, however I am using python 3 and am unable to run this process with madgraph version 2

Revision history for this message
Olivier Mattelaer (olivier-mattelaer) said :
#3

Hi,

Would you have the model link such that I can give it a try?

Independently, the LTS version (2.9.x) is python3 compatible (we actually do not support python2 anymore) so this should be a direct working solution.

Also you can also try to add the command:
set nlo_mixed_expansion False
this should allow version3 to behave like in v2

Cheers,

Olivier

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Disha Bhatia (dishabhatia1989) said :
#4

Thanks a lot Olivier, using the command set nlo_mixed_expansion False, I could run the program.

Thank you very much.
Disha