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Slides for EB3. Left Problems from EB2 1. Why muon triggers are not used in e channel? 2. Add...
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Transcript of Slides for EB3. Left Problems from EB2 1. Why muon triggers are not used in e channel? 2. Add...
![Page 1: Slides for EB3. Left Problems from EB2 1. Why muon triggers are not used in e channel? 2. Add backgrounds estimation for signal search region 3. Add.](https://reader036.fdocuments.us/reader036/viewer/2022062317/5a4d1b1a7f8b9ab059993133/html5/thumbnails/1.jpg)
Slides for EB3
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Left Problems from EB2• 1. Why muon triggers are not used in e channel?• 2. Add backgrounds estimation for signal search region • 3. Add expected limits for signal search: stau neutrino & Z’• 4. In the emu channel the main bkg is ttbar. Would applying a bjet
veto help?• 5. Validate Wjet background at high mass region(shape from MC)• 6. QCD bkg comes from OS/SS method, relying on results from h->tautau for validation of the technique (NOS_QCD=NSS_QCD). An
independent validation might be useful• 7. some adjustments of text or format
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Status • Update muon selection, use only high pT recommendation• We have formed a new version of supporting note including
all the issues listed in slide #2• https://cds.cern.ch/record/1622230• waiting for the EB3• some further consistent check for FAR, will update the note if
needed
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Update 1. add muon trigger into e channel
• For emu channel(data & MC):EF e24vhi medium1||EF e60 medium1
EF e24vhi medium1||EF e60 medium1||EF mu24i tight||EF mu36 tight
Only ele trigger Ele+mu trigger
data 13088 13710
MC 12740 13224
For Validation region (M<200GeV)
~ 5% more events
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Update 2. add backgrounds estimation for signal search region
emu etau
mutau
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Update 2. add backgrounds estimation for signal search region
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Update 2. add backgrounds estimation for signal search region
emu
etau
mutau
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Update 3. Add expected limits for signal search
Bayesian method is used to set limits for search
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Update 3. Add expected limits for signal searchSearch for signal in a mass window for mass M signal: [M-3, M+3 ]
Inputs: expected background number and systematics in each mass windowSignal efficiency * Luminosity and systematics for each mass point
e channel as an example
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Update 3. Add expected limits for signal searchStau neutrino Z’
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Update 4 use b tagging to veto ttbar bkgd
• Ttbar background is one of the dominant background in emu channel for both validation region and signal search region.
• use btagging to veto ttbar background use MV1 method use 70% efficiency work point require the bjet number in a event is 0
•
More than 80% ttbar events are vetoed
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Update 4 use b tagging to veto ttbar bkgdSystematics with btagging
Signal efficiencies are almost not affected by the N-bjet=0 requirement ~ 1% decreased
We have no gain for high mass region(M>1000GeV)
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Update 5 Validate W+jet bkgd at high mass region
Wjet bkgd is validated in a data control region
• invert the cut on the angle phi between the leptons (, )(use , for an example ) from dphi > 2.7 to 1 <dphi < 2.7
• all other cuts are kept the same as signal selection• The signal from a resonance has almost no contribution at this
region whereas backgrounds are much wider.• Statistics are not great but OK
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Update 5 Validate W+jet bkgd at high mass region
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W+jet Enhanced control sample
• Missing Et > 30 GeV (enhance W).• Remove opposite sign requirement• Njet < 2 (reduce t tbar).‐• Remove Pt cut (increases statistics).
Update 5 Validate W+jet bkgd at high mass region
MC says that about 90% of events are W+jet
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Update 5 Validate W+jet bkgd at high mass region
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• In QCD calculation, we assume NOS_QCD =NSS_QCD is this correct ?• Construct a data control sample and perform a validation: same requirements as signal selection expect: reverse muon isolation requirement add MET<10GeV use non-isolated EF_mu36_tight trigger
Update 6 QCD test
We quote an additional 10% uncertainty for QCD multi-jet background