Update on performing skims, producing a control region to isolate tt+bb+jj. slides

why study jet multiplicity?

4 b’s are a key aspect of the tttt signal. tt+bb+cc+jj looks a lot like signal, so the MC must model this well, in order for us to kill the bkg. eventually we will train a new BDT with updated lepton ID and btagging.

check out the tttt project here!