MadGraph5_aMC@NLO

How to set 4FL and 5FL scenarios for z+bb predictions?

Asked by Sara

To calculate z+bb prediction, I want to compare 4FL and 5FL scenarios at NLO.
In the madgraph I defined:
4FL:
import model loop_sm (means nf=4)
generate p p > l+ l- b~ b [QCD]
where
p = g u c d s u~ c~ d~ s~
l+ = e+ mu+
l- = e- mu-
lhapdf:4FL

5FL:
import model loop_sm-no_b_mass (means nf=5)
generate p p > l+ l- j [QCD] where
p = u c s d b u~ c~ s~ d~ b~ g
j = u c s d b u~ c~ s~ d~ b~ g
lhapdf:5FL

Are both the settings correct?
Best,
Sara

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Yes your two syntax are correct and in the flavour scheme that you claim.
Now I have never perform such type of comparison so I do not claim that compare those two proccesses is enough/the correct things to do.

Cheers,

Olivier

> On 17 Jan 2022, at 17:35, Sara <email address hidden> wrote:
>
> New question #700266 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/700266
>
> To calculate z+bb prediction, I want to compare 4FL and 5FL scenarios at NLO.
> In the madgraph I defined:
> 4FL:
> import model loop_sm (means nf=4)
> generate p p > l+ l- b~ b [QCD]
> where
> p = g u c d s u~ c~ d~ s~
> l+ = e+ mu+
> l- = e- mu-
> lhapdf:4FL
>
> 5FL:
> import model loop_sm-no_b_mass (means nf=5)
> generate p p > l+ l- j [QCD] where
> p = u c s d b u~ c~ s~ d~ b~ g
> j = u c s d b u~ c~ s~ d~ b~ g
> lhapdf:5FL
>
> Are both the settings correct?
> Best,
> Sara
>
> --
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