deduce the branching fractions for Z decays
I'm trying to deduce the ratio of branching fractions for Z decay to neutrinos and Z decay to charged leptons from the following samples that were centrally generated with MG_aMC@NLO at NLO in CMS:
DY (ll)+ 2j
Z(vv) + 2j
I look at the event yields in my fiducial region (within 20 GeV of Z mass and Z boson pT > 200 GeV) and after correcting the DY sample for the gamma* correction, I obtain a ratio of Z(vv)/Z(ll) which is a few % higher than 6.0. I want to deduce the branching fraction for Z-->ll and for Z-->vv that were used in the MC to see how they compare to the PDG values. Is it possible to do this?
Many thanks!
Sarah
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