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Feasibility of Third Lepton Selection in SU1 Cuts on Jets' pT

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Study on enhancing third lepton selection in SU1 cuts on jet transverse momentum, impacting event signal and background in SM Z+jets scenario.

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Feasibility of Third Lepton Selection in SU1 Cuts on Jets' pT

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  1. Cut optimisation on SU1 Cuts on jets’ pT Feasibility of third lepton selection SM background: Z+jets (fast) Lecce-Napoli phonemeeting – 18/7/2006

  2. Cuts on jets’ pT • Run on full simulation SU1 point (22.6 fb-1). • Presently 4 jets are required to be in the event, having pT > 100, 50, 50, 50 GeV. In SU1 full this cuts signal with fraction 0.45 and SUSY bckg 0.38 • Two harder scenarios have been also considered:

  3. Feasibility of third lepton selection • Run on full simulation SU1 point (22.6 fb-1). • Present selection based on only 2 leptons: 301 signal events out of 2196 (S/B=0.159). • Asking for 3 (or more) leptons we gain other 68 signal events out of 335 (S/B=0.255*12), where 12 is the efficiency in “guessing” the correct dilepton in selection. • No evident criteria observed for this guessing (pT, mll, ETisol, R…) • Even if we got 12=1 the total S/B would be 0.171 (no appreciable increase) while our selection efficiency would increase by a relative 20% only.

  4. Zll+jets available ATLFAST samples Files located in: /castor/cern.ch/grid/atlas/datafiles/susy/atlfast/2006_b/ZllJetsAlpgen (same amount of muons and electrons processed)

  5. Dilepton invariant mass in Zll Dielectrons  ~ 3 GeV Dimuons  ~ 10 GeV

  6. Zll bckg on SU1 signal Normalized to 23 fb-1 m(ll)

  7. Zll bckg on SU1 signal Normalized to 23 fb-1 m(llj)

  8. Missing ET: SM bckg vs. SU1

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