Method to exclude duplicated processes
Dear Olivier,
I am trying to make WW NLO samples with same flavor lepton decays but wonder if what I am doing would make sense.
So I am doing like below
generate p p > e+ ve w- [QCD] -> [1]
add process p p > e- ve~ w+ [QCD] -> [2]
and in MadSpin
decay w- > e- ve~ -> [3]
decay w+ > e+ ve -> [4]
But this would be problematic when the "e+ ve" from [1] is from onshell W+ since it will give you duplicated contributions from [2] + [4]. Is my guess correct?
[1] + [3] will give you :
(1) onshell w+ & onshell w-
(2) offshell w+ & onshell w-
[2] + [4] will give you :
(3) onshell w+ & onshell w-
(4) onshell w+ & offshell w-
Due to (1) and (3), there is some double countings -> This is my understanding
If my understanding is correct I wonder if this would avoid the double counting issues
generate p p > e+ ve w- $$ w+ [QCD] -> [1]
add process p p > e- ve~ w+ [QCD] -> [2]
and in MadSpin
decay w- > e- ve~ -> [3]
decay w+ > e+ ve -> [4]
Then I expect that [1] would not allow onshell w+ production and thus give you
[1] + [3]
(1) offshell w+ & onshell w-
[2] + [4]
(2) onshell w+ & onshell w-
(3) onshell w+ & offshell w-
Would this be a correct way to remove duplicated onshell w+ and onshell w- contributions?
Regards,
Sihyun.
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