mmll cut behaviour in multilepton processes
Dear experts,
I am comparing a private tZq (actually tllbq) sample to a “default” (CMS) sample, using the same process definitions:
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define l+ = e+ mu+ ta+
define l- = e- mu- ta-
define vl = ve vm vt
define vl~ = ve~ vm~ vt~
generate p p > t b~ j l+ l- $$ w+ w- / h
add process p p > t~ b j l+ l- $$ w+ w- / h
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In my case I am only interested in trileptonic events, hence I force the leptonic decay of the top in the madspin card (to significantly increase my final selection efficiency) :
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decay t > w+ b, w+ > l+ vl
decay t~ > w- b~, w- > l- vl~
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However I noticed some disagreements in the kinematics of the 2 samples, which seem to be especially related to the lepton from the top. I would like to know whether this could be related to the mll>30 cut applied in both samples ?
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30.0 = mmll ! min invariant mass of l+l- (same flavour) lepton pair
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In other words, is is possible that this introduces a bias because:
a) In the default sample, the cut only applies to the unique OSSF pair (in tl+l-bq), and *then* the top is decayed ?
b) In my private sample, the cut applies to *all OSSF pairs* among the 3 leptons (i.e. it is applied *after* the Madspin decay) ?
Thanks in advance for the clarification, cheers,
Nicolas
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