MadGraph5_aMC@NLO

MadGraph scale choice

Asked by Yury

Hi,

I found in https://answers.launchpad.net/mg5amcnlo/+faq/2014 that when dynamical_scale_choice = -1 in the run_card.dat, that means that the default scale choice will be used. But how do I figure out what is this default scale choice?

Thanks!

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Olivier Mattelaer
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Yury (letra1947) said : 		#1

Any ideas?

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Olivier Mattelaer (olivier-mattelaer) said : 		#2

Hi,

For LO code generated (so not [QCD]) then the scale will be determined by a CKKW clustering based on the channel integration.
So in that case they are no analytical formula associated to the scale (depending of the process/channel it can by HT/2 or shat or ... something else)

For NLO code, -1 should be HT/2

Cheers,

Olivier

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Yury (letra1947) said : 		#3

Okay, thanks. And HT is the scalar sum of the jet transverse momenta?

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Best Olivier Mattelaer (olivier-mattelaer) said : 		#4

no the one of the full final state

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Yury (letra1947) said : 		#5

Thanks Olivier Mattelaer, that solved my question.