Update on trilepton

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Update on trilepton

• DATASETS
• Bhmu0d L346 pb-1 GEN 5
• Bhmu0h L399 pb-1 GEN 6
• BACKGROUNDS
• DIMUON REGIONS
• Gen 5 MC (5.3.4) for all major background
• Cross check t-tbar and WW contribution against
  6.1.3 MC if needed, use in trilepton region (top
  mass 175 GeV large statistics)
• TRILEPTON REGIONS
• Gen 5 MC (5.3.4) for all backgrounds
• New DY Z/????? with ISR/FSR
• Just finished stripping, so results refer to
  Pythia Z/????? with FSR only
• FAKE
• Beate calculated the new fake rate for the
  leptons (not implemented yet)

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Lepton ID

• CHANGE TO THE ID requirement
• CMU muon ?x lt 7 cm (from lt3 cm)
• Add ?2 requirement to any muon (not for CMIO
  below 20 GeV)
• Add tight d0 cut on any muon (not for CMIO below
  20 GeV)
• Add tight d0 cut on electron to reject
  conversions
• Loosen the conversion removal cuts
• For the CMIO, want to change the definition to
  avoid discontinuity add tight d0 cut and ?2
  requirement also to CMIO below 20 GeV.

• HIGH pt scale factors and trigger efficiencies
• High pt group blessed the results
• Else calculated the sf for low pt muons for GEN5
  data and GEN 5 MC including the isolation
  efficiency into the ID efficiency to be
  consistent with high pt group
• Low pt muon sf for GEN6 data and GEN5 MC on going
• As for now using the same scale factor as for GEN
  5

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Conversion scale factor

• CDF note released last week (CDF8073)
• Better understanding of the first bin in the
  scale factor as a function of the seed electron
  Et (changed datasample, modified the background
  subtraction, revisited systematic uncertainties)
• It has been revised ever since (not uploaded as
  CDF note yet)

• Implementation
• Select events with simulated photon
• Apply conversion removal algorithm to any seed
  electron with partner track pt gt 0.7 GeV
• If the electron passed the filter, the event is
  scaled up

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Control Regions (CR)
nJets lt 2 nJets gt 1
E F
A A2
A A2
MET
10 15
I J
G H
G H
15 76 106
Invariant Mass of OS muons M??
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GEN5 Dimuon CR
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GEN6 Dimuon CR
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Region G
New data only Fakes are not included in any plot
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Region Z
Cross sections 1) CMUPCMUP s252?15(sys) 2)
CMXCMX s236?14(sys)
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Outside the Z
Any dimuon event Will apply M?? gt 15 GeV MC
simulation for 15ltMlt20 GeV to be included
No low mass cut
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Jet outside the Z
No low mass cut No effect due to the
chimney/crack Try to implement L1 JEC, same
results
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High jet mult.regions
F (in the Z, high met, high jet mult.)
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Control region A

• Met for fake events
• Met 35 GeV
• Met 16 GeV
• Met 26 GeV

Jet for fake events 2 events, N 0 1 event, N
1

• Mass for fake events
• M 162 GeV
• M 63 GeV
• M 23 GeV

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Gen5Trilepton CR
Trilepton control regions need to be updated with
the new fake rate and the new DY sample
temporary results from last Elses talk (data are
shown with the up to date selection)
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Gen6 Trilepton CR
Trilepton control regions need to be updated with
the new fake rate and the new DY sample
temporary results from last Elses talk (data are
shown with the up to date selection)
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Sensitivity

• New data only , L 399.5 pb-1
• Fakes from Stntuple dataset bexo2h, old fake
  rate
• CMU dx 3 cm for any muon in the event

Using the new selection for the total data
available (346399pb-1) SUSY expected signal
1.6 ? 0.07
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GEN5 ?e analysis
Plug e
Central e
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GEN6 ?e analysis
Central e
Plug e
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Plan

• SCHEDULE
• Request un-blinding on Feb 16th
• DO we show separate Gen5 and Gen6 data?
• Pre-bless on Feb 24th
• Pre-bless the combined limit on March 1st
• Bless on March (presented at Moriond EWK)

• STATUS of ALL CHANNELS
• High pt electrons request unblind next week
  issues for the high jet mult regions in GEN6 data
• Low pt electrons unblinded GEN6 data yesterday
• Low pt muons unblinded GEN5 data yesterday (no
  events found)

• Steps
• Finalize ID cuts for CMIO
• Implement new fake rate in the trileptons CR
• Use the new Z/? sample in the same regions
• Calculate the major systematic uncertainties
• Would like to understand better the high jet
  mult. regions even though they are not related to
  our signal (is this fake contribution?)

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CMX Geometry
KEYSTONE
MINISKIRT
MINISKIRT
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MC 5.3 samples zewk6m Z??? 3M events
zewk8t Z??? 10M
sexo8/9t DY (low mass conv) 4 10 M
hewk0x W? (Madgraph)
200k each wexo0z WZ/?
(Beates) 120k ttopel
178 GeV ttbar 1M
wtop1w WW
400k dog10z ZZ (Oscars)
160k SUSY results quoted are
Anadi-point values
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Blessed tight-tight
2 muons
3 leptons
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Z new data
No smearing applied