S-Quark Top Direct Searching
in
Dileptonic Events 13 TeV
IFCA-Student Meeting, 8 Mayo 2017
BARBARA CHAZIN
TTZ Scale Factor
Selection A
Selection B
|m2l - Z_MASS| < 10. GeV
leading_jetpt > 20. GeV
2bjet CSVv2M; jet_pt>= 20. GeV
MET >= 140. GeV
|m2l - Z_MASS| < 10. GeV
njet >= 4; jet_pt > 40. GeV
2bjet CSVv2M; jet_pt >= 30. GeV
MET >= 30. GeV
SFA = (data -bck)/sig = (9 -1 )/7 = 1.14
SF B= (data -bck)/sig = (11-1 )/13= 0.77
New representation plot:
Distributions with ratio S/sqrt(B) + ratio Data/MC
Useful in the analysis to check the sensitive numbers
Baseline selection: 2 OS leptons (pt > 20, 25 GeV), mll > 20 GeV, Zveto (15 GeV window)
Check the mt2ll-met combination
tio
Check the selection:
Bjet veto: 1 leading bjet, pt > 20 GeV
20
Check the sensitive numbers:
This plot is Not fully understood (check with the SR* and VR* plot and draw cuts evolution )
Analysis Note AN-16-483
Backup
Re-reco and Summer16 – March- (bug in the mm MC veto requirement)
Update:
Code: https://github.com/chazinb/AnalysisCMS
Plots: https://bchazinq.web.cern.ch/bchazinq/reReco_summer16/Stop/
We already know that the disagreement in data/mc ratio for met distributions is due to
the PU reweigthing and maybe other factors.
I check this ratio in three region:
Base selection: 2 leptons + mll >20 GeV + Z veto in ee and mm channels
Top region: >=2 jet + 1 b jet + emu channel + Base selection
Z selection: Z window (15 GeV) + 2 leptons + mll >20 GeV
Done WW region: 0 jet + emu channel + Base selection
For MET, lepton pt, jet pt, number of jets
* I am checking with Jónatan the corrections we apply in AnalysisCMS → Done
** Pending to check _gen_Ptll scale factor in eventW for the full lumi 2016
Met distribution
ee
Top Like region
Base Selection
Z Selection
Met distribution
mumu
Top Like region
Base Selection
Z Selection
Met distribution
emu
Top Region
Base Selection
WW Region
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Conclusions:
We can see that the bulk of the met distribution is dominated by DY,
and the agreement data-mc for this procces is quite low with a
shape tendency
When Ttbar is dominating one can observe a general scale factor
missing < 10% . The disagreement data/mc is likely covered by
considering all systematic and statistical uncertainties in these plots.
The WW region is widely dominated by DY, so, not too much can be
concluded. The high statistical error bars at Met > 80 GeV give no
bad agreement data/mc
There are not notable differences in the bulk of the met distribution
between different channels. But, comparing the tails ( Met > 120
GeV) in all selected regions, the ratio has quite different behaviour
between ee and mm channels.
Leptons Pt distributions Base Selection
https://bchazinq.web.cern.ch/bchazinq/reReco_summer16/Stop/00_Zveto/?match=lep1
https://bchazinq.web.cern.ch/bchazinq/reReco_summer16/Stop/00_Zveto/?match=lep2
Leptons Pt distributions Top region + MET >= 50
https://bchazinq.web.cern.ch/bchazinq/reReco_summer16/Stop/00_TTselMET/?match=lep1
https://bchazinq.web.cern.ch/bchazinq/reReco_summer16/Stop/00_TTselMET/?match=lep2
Leptons Pt distributions WW region + MET >= 50
https://bchazinq.web.cern.ch/bchazinq/reReco_summer16/Stop/00_WWselMET/?match=lep1
https://bchazinq.web.cern.ch/bchazinq/reReco_summer16/Stop/00_WWselMET/?match=lep2
Leptons Pt distributions Z selection
https://bchazinq.web.cern.ch/bchazinq/reReco_summer16/Stop/05_Zpeak/?match=lep1
https://bchazinq.web.cern.ch/bchazinq/reReco_summer16/Stop/05_Zpeak/?match=lep2
Jet Pt distributions
Base Selection
https://bchazinq.web.cern.ch/bchazinq/reReco_summer16/Stop/00_Zveto/?match=jet1
https://bchazinq.web.cern.ch/bchazinq/reReco_summer16/Stop/00_Zveto/?match=jet2
nJet distribution
Base Selection
Jet Pt distributions
Top region +50
nJet distribution
Top region +50
DY Selection
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Conclusion
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Great disagreement in high b-jets multiplicity
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No bad agreement data-mc for lepton and jet pt and n jets
distributions.