identical particles affect cross section
Dear experts,
I'm trying to understand the cross section of the following processes, (other kinematic cuts are the defaults, using MG273)
scheme1, p p > l+ l- l+ l- : XS = 0.02456 pb ( l- = e-, mu-)
scheme2, p p > z l+ l-, z > l+ l- : XS = 0.03904 pb (l- = e-, mu-, and set 'True = cut_decays')
scheme3, p p > z z, z > l+ l- : XS = 0.01766 pb (l- = e-, mu-, and set 'True = cut_decays')
scheme4, p p > l+ l- l+ l- $z: XS = 0.00075 pb ( l- = e-, mu-)
scheme1 is the inclusive one, and the motivation of scheme2 is to avoid two off-shell Z.
it seems to me that the two on-shell Z in scheme2 has been calculated twice, as the difference of scheme2 and scheme3 is 0.02138 pb, which is smaller than the inclusive one. do i understand correctly?
Cheers, Meng
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