MadGraph5_aMC@NLO

b-tagging in 5F scheme

Asked by Sebastien Prince

Dear experts,

I am curious as to why in fNLO predictions b-tagging cannot be implemented in cuts.f for massless b quarks (5F scheme), as mentioned in the comments for the iPDG variable. It cannot be implemented since that variable is never 5 or -5.

Is that a limitation of the software or is there a physical reason for that?

I don't think it is the latter since, after building jets, divergences related to the massless nature of the b quark should be gone. Thus it should be sensible to check if the b quark is associated to a jet and cutting on that. It is possible to do this after showering for MC@NLO predictions.

Regards,

Sebastien

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Phi

This is related to code optimisation at that stage of the program the flavour are not yet assigned

Cheers

Olivier

________________________________________
From: <email address hidden> <email address hidden> on behalf of Sebastien Prince <email address hidden>
Sent: Thursday, December 7, 2017 6:22:42 PM
To: Olivier Mattelaer
Subject: [Question #661487]: b-tagging in 5F scheme

New question #661487 on MadGraph5_aMC@NLO:
https://answers.launchpad.net/mg5amcnlo/+question/661487

Dear experts,

I am curious as to why in fNLO predictions b-tagging cannot be implemented in cuts.f for massless b quarks (5F scheme), as mentioned in the comments for the iPDG variable. It cannot be implemented since that variable is never 5 or -5.

Is that a limitation of the software or is there a physical reason for that?

I don't think it is the latter since, after building jets, divergences related to the massless nature of the b quark should be gone. Thus it should be sensible to check if the b quark is associated to a jet and cutting on that. It is possible to do this after showering for MC@NLO predictions.

Regards,

Sebastien

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