MadGraph5_aMC@NLO

syntax to exclue more than particle in madgraph

Asked by a.s.abdelalim

Sometimes you might want to exclude Feynman diagrams that contain a particular particle. For example, suppose you wanted to generate a sample of electron + positron production, but you wanted to exclude any Feynman diagrams that contain a Z boson. You could do this by:

generate p p > e+ e- / Z
The "/ Z" means to exclude a Feynman diagram if it has a Z boson in it. You can also exclude a particle from appearing in the s-channel, by
generate p p > e+ e- $ Z

    The queston here how i can exclue more than particle in madgraph ?

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Olivier Mattelaer (olivier-mattelaer) said : 		#1

Hi,

The syntax generate p p > e+ e- $ Z does not exclude the partcile from appearing in S-channel, but forbid the particle to be resonant.
(so you keep the off-shell contribution and the associated interference)
To fully remove the particle to appear in S-channel the syntax is
generate p p > e+ e- $$ Z

To exclude more than one particle you can specify both particle after the exclusion symbol so for example
generate p p > e+ e- / h Z

Cheers,

Olivier

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