is the process p p > z b process is available on madgraph5??

Asked by Anees khan

can anyone tell me how to generate above mentioned process

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Olivier Mattelaer (olivier-mattelaer) said :
#1

import model sm-no_b_mass
generate p p > z b

since you need a "b" quark in the initial state , you have to use a five flavor model for your computation

Cheers,

Olivier

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Anees khan (aneeskhan) said :
#2

Thanks Olivier Mattelaer, that solved my question.

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Anees khan (aneeskhan) said :
#3

what if i want to use mass of b quark,which is 0 in sm-no_b_mass model

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Olivier Mattelaer (olivier-mattelaer) said :
#4

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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