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Signal and branching fractions Backgrounds and Triggers for the different “signatures”. Z -> t t. Z -> t t ->. t t -> t h t h n n s* b = 82 pb t t -> t h e n n n39 pb t t -> t h m n n n39 pb t t -> m e n n n n12 pb - PowerPoint PPT Presentation
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Z ->
• Signal and branching fractions
• Backgrounds and Triggers for the different “signatures”
Z -> -> ...
• h h b = 82 pb
• h e pb
• h pb
• e pb
• pb• e e pb
Z -> -> ee/
• Background:
• Z-> ee , Z-> b 30 times higher than for signal
• as in decays aligned with no difference in
• leptons have lower pt for signal (bad…)
• invariant mass - mZ
• But be aware: contribution…
Z -> -> ee• pT electrons > 10 GeV
(DIEL trigger)• Z -> : .5% (.125)
20% of signal• Z -> ee : 38%• QCD: 0.02%: 1 event
(from4528 events with pt>20 GeV)
• ee inv. mass < 60 GeV: 1% Z -> ee left
• reinvestigate single e with higher statistic
Z -> -> • pT muons > 4 GeV
(DIMUON trigger)• Z -> : 1.1% (.3%
background), 36%• Z -> : 36%• QCD: 9% of events with
pt>20 GeV• inv. mass < 60 GeV:
9% Z -> left• 0.6% from 800 W fake
Z -> -> e
• = 12 pb
• Physics background: WW-> e pb)
top top-> b b e • QCD via misidentification (Zee, Z,W…)
• MU_EM: L1 e > 5 GeV, L2> 10 GeV L1,L2 > 4 GeV
Z -> -> ee/e
• e: 16% eff
• 28 events (22 in right category)
• with projecting the MET back-> Z mass
• statistics too low for a meaningful plot
Z -> -> h lep
• Signal = 39 pb each• Backgrounds:• QCD misidentification• Z(+ jets)-> ll + jets with misid+inefficiency• W(+jets) -> l + misid
• WW -> e h
• h : for now require NN>0.4
Z -> -> h lep
• Possible triggers (electron case):A) Single electron: e pt>15GeV B) electron+jet: e pt> 10 GeV, jet> 10GeV C) electron+e pt>5 GeV (needs track trigger)
• Muon case: A) Single : threshold 7 GeV B) + jet: pt > 4 GeV but jet ET>20 GeV C) + : pt > 4 GeV and 5 GeV
Z -> -> h lep
Z -> -> h h
• Di tau trigger: needs track trigger
• requires two tracks > 5 GeV, one with preshower + 2 jets > 3 GeV
• difficult to study without trigger simulator...
Z -> -> h lep
• QCD
• blue: • red: e• black: em
Z -> needed:
• Working trigger simulator with events that can be processed by it
• root-tuples (or at least reco files) of:– Signal Z -> about 10k events– QCD files– W->e , W-> other, same statistics– other backgrounds as top, b, WW
Z -> Conclusions
• Only leptonic decays:– expect about 20% efficiency– probably only e mode usable
• Leptonic hadronic mode:– efficiencies about 25% (40% without req)
• Only had: need trigger simulator
• And overall: need more statistics …
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