MadGraph5_aMC@NLO

how can i use mass of b quark,which is 0 in sm-no_b_mass model

Asked by Anees khan

how can i use mass of b quark
which is 0 in sm-no_b_mass model
I want to generate p p > z b

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

If you want to use a four flavor scheme,
then you need to change your process definition to
p p > z b b~
so import model sm
generate p p > z b b~

Some people use also the following definition but this is theoretically inconsistent since the b quark PDF are fitted for massless b quark. So I personally do not recomend such mixed setup of theoretical assumption
import model sm
define p = p b b~
generate p p > z b

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