MadGraph5_aMC@NLO

colour amp problem with EFT diagrams

Asked by Eleni Vryonidou

Hi Olivier,

with the SMEFTatNLO model and the following commands:

import model SMEFTatNLO-NLO
generate g g > h QED=1 QCD=2 NP=2 [QCD]

the code crashes at output with an error like this:

File "/Users/evryonidou/MG5_aMC_v3_0_0/madgraph/iolibs/export_v4.py", line 1118, in get_icolamp_lines
    bool_list = [(i + 1 in diag_jamp[num_diag]) for i in range(colamps)]
KeyError: 1

This seems to be related to some tadpole diagrams. I had seen the same problem before and Valentin suggested a temporary patch but as this problem is now reported by other users it might be worth finding a better solution.
Any ideas?

Thanks,

Eleni

Question information

Language:
English Edit question
Status:
Open
For:
MadGraph5_aMC@NLO Edit question
Assignee:
Valentin Hirschi Edit question
Last query:
Last reply:
Revision history for this message
Eleni Vryonidou (evryonidou) said : 		#1

Hi Valentin,

any opinion on this?

Cheers,

Eleni

Revision history for this message
Eleni Vryonidou (evryonidou) said : 		#2

If it helps here is what Valentin had suggested at the time:

You substitute

diag_jamp = {}

with

diag_jamp = dict((i,[]) for i in mapconfigs)

around line 974 of export_v4.py

Revision history for this message
Hannes (hannes3) said : 		#3

Hi,

just to say that we in ATLAS are interested in getting this patched as well but for this we would need to understand whether a permanent solution is planned and be sure that the above fix doesn't break anything.

Cheers,
Hannes

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