MadGraph5_aMC@NLO

inquiry

Asked by Bosy

HI MG experts
During the process there is a messeage "dont use this pyhtia lhe file in detector studies".
can i ask whey ??
Thank

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

Hi Bosy,

Sure, the problem is that in order to get file such file, we have to performe a (very simplified) detector simulation.
(i.e. jet algorithm). If I'm correct this is a cone jet algorithm that nobody will advise to use anymore. But this is enough for what
we want to do with this file: Have a quick way to see the output of pythia and being to make some plots.

SInce we already preformed some jet algorithm this file is not suitable to be used for a detector simulation since it doesn't have anymore all the tracks needed by a serious detector simulation.

Cheers,

Olivier

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Bosy (bothinagalal) said : 		#2

HI Olivier
just apologize my leak information
So , what if i typed the analyis in MG to be pyhtia+Delphes??
is Delphes repeat the jet algorithm ?? or in this case jet algorithm igonerd and left to Delphes to do so ???
Thanks for your interset
Bosy

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Best Olivier Mattelaer (olivier-mattelaer) said : 		#3

Delphes don't use the lhe output.
So no problem on that side and indeed Delphes used fastjet in order to have the jet algo.

Cheers,

Olivier

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Bosy (bothinagalal) said : 		#4

Thanks Olivier Mattelaer, that solved my question.