W, Z + jets Production Important test of QCD and recent NLO predictions Important background for numerous searches Selection: W lepton PT > 20 GeV, PF MT > 20 GeV Z leading (2 nd ) lepton > 20 (10) GeV, 60 < MZ <120 GeV PF jets > 30 GeV and |  | < 2.4  R > 0.3 with electrons ET corrected for average pileup Z signal extracted with MZ fit W signal extracted with MT fit in N-tag categories
{}