MadGraph5_aMC@NLO

pp > hhjj total cross-section

Asked by Luca

Dear Experts,

I want to write an analysis for the process pp > hhjj at LO at COM Energy of 100 TeV. I have generated .lhe files in two different ways:

1. generate p p > h h j j [QCD]

and then I run the process at LO.

2. generate p p > h h j j

I then analyze the two processes using madanalysis. However the two procedures lead to very different results already at the inclusive level - the total cross-section differs by a factor of ~2. Is there any obvious reason for this behaviour?

ps. The second procedure sometimes fails after producing the .lhe file with the error

INFO: # currently at event 0 [elapsed time: 0.0081 s]
Command "generate_events run_02" interrupted with error:
ValueError : could not convert string to float: </totfact>
Please report this bug on https://bugs.launchpad.net/mg5amcnlo
More information is found in '/mnt/yellowraid/scratch1/lr/MG5_aMC_v2_5_1/hhjjLO/run_02_tag_1_debug.log'.
Please attach this file to your report.
INFO: storing files of previous run

Many thanks

Luca

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Luca (r8li) said : 		#1

I have done some extra tests and the difference seems to be related to the cuts applied at the runcard level - the default runcards have different cuts on jets (and for some of them I cannot find an exact correspondence...).