CLIC workshop 5 feb 2014 Marco Szalay - Indico

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H->bb/cc/gg at 350 GeV
CLIC workshop 5 feb 2014
Marco Szalay
!1
Outline
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Signal Extraction: isolated lepton finder Jet Cluster + Flavor tag TMVA signals and backgrounds classification
•
Flavor Tagging bb, cc tagging ideas to separate gg from other jet final states
•
Hvv analysis Reconstructed Energy PtH
•
Conclusions
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
Marco Szalay
!2
Outline
•
Signal Extraction: isolated lepton finder Jet Cluster + Flavor tag TMVA signals and backgrounds classification
•
Flavor Tagging bb, cc tagging ideas to separate gg from other jet final states
•
Hvv analysis Reconstructed Energy PtH
•
Conclusions
H->bb/cc/gg at 350 GeV
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CLIC workshop - CERN 5-2-2014
!
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Marco Szalay
!2
Samples
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Signals: Hvv inclusive (dst2028) HZ, Z-> e+/e- (dst2085) HZ, Z-> μ+/μ- (dst2088) HZ, Z-> jets (dst2558)
H->bb/cc/gg at 350 GeV
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Backgrounds: ee->qqvv (dst2862) ee->qqlv (dst2865) ee->qqll (dst2868) ee->qqqq (dst2871)
CLIC workshop - CERN 5-2-2014
Marco Szalay
!3
Samples
•
Signals: Hvv inclusive (dst2028) HZ, Z-> e+/e- (dst2085) HZ, Z-> μ+/μ- (dst2088) HZ, Z-> jets (dst2558)
•
Backgrounds: ee->qqvv (dst2862) ee->qqlv (dst2865) ee->qqll (dst2868) ee->qqqq (dst2871)
Not Processed yet!
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
Marco Szalay
!3
Signal Extraction
selected
Pandora dst collection
2 jets
search for
isolated
leptons
4 jets
LCFI Plus + NN flavor tagging
found μ+/μfound e+/eremove e+/e-
remove μ+/μ-
2 jets
2 jets
find best jet
match for Z and H
Multiclass TMVA classifier (BDTG)
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
E, pt, thrust, Cos(θH),
Ynn, MZ, MH, Cos(θZ),
PtH, PtZ, # charged
particles…
Marco Szalay
!4
Signal Extraction
selected
Pandora dst collection
2 jets
search for
isolated
leptons
4 jets
LCFI Plus + NN flavor tagging
found μ+/μfound e+/eremove e+/e-
remove μ+/μ-
2 jets
2 jets
find best jet
match for Z and H
Multiclass TMVA classifier (BDTG)
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
E, pt, thrust, Cos(θH),
Ynn, MZ, MH, Cos(θZ),
PtH, PtZ, # charged
particles…
Marco Szalay
!5
Search for isolated leptons
•
Create a list of available e+/e-(μ+/μ-) with 10 GeV < E < 160 GeV
•
Sum E of all particles in a cone with angle θ = 20°,
if > 20 GeV, remove lepton from list.
•
Compute the invariant mass of every remaining e+/
e-(μ+/μ-) pair and remove that closest to the Z
mass, if in the interval 70-110 GeV (80-100 for μ)
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
Marco Szalay
!6
Signal Extraction
selected
Pandora dst collection
2 jets
search for
isolated
leptons
4 jets
LCFI Plus (Durham) + NN flavor tagging
found μ+/μfound e+/eremove e+/e-
remove μ+/μ-
2 jets
2 jets
find best jet
match for Z and H
Multiclass TMVA classifier (BDTG)
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
E, pt, thrust, Cos(θH),
Ynn, MZ, MH, Cos(θZ),
PtH, PtZ, # charged
particles…
Marco Szalay
!7
Signal Extraction
selected
Pandora dst collection
2 jets
search for
isolated
leptons
found e+/e-
4 jets
Hvv HZ, Z->jets candidates candidates
H->bb/cc/gg at 350 GeV
found μ+/μ-
remove e+/e-
remove μ+/μ-
2 jets
2 jets
HZ, Z->ee HZ, Z->μμ candidates candidates
CLIC workshop - CERN 5-2-2014
Marco Szalay
!7
Signal Extraction
selected
Pandora dst collection
2 jets
search for
isolated
leptons
found μ+/μfound e+/e-
4 jets
Hvv HZ, Z->jets candidates candidates
remove e+/e-
remove μ+/μ-
2 jets
2 jets
HZ, Z->ee HZ, Z->μμ candidates candidates
Vertex Information + Neural Network
used to tag b and c jet likelihood
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
Marco Szalay
!7
Signal Extraction
selected
Pandora dst collection
2 jets
search for
isolated
leptons
4 jets
LCFI Plus + NN flavor tagging
found μ+/μfound e+/eremove e+/e-
remove μ+/μ-
2 jets
2 jets
find best jet
match for Z and H
Multiclass TMVA classifier (BDTG)
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
E, pt, thrust, Cos(θH),
Ynn, MZ, MH, Cos(θZ),
PtH, PtZ, # charged
particles…
Marco Szalay
!8
TMVA - I
Hvv HZ, Z->ll HZ, Z->mumu"
HZ, Z->jets
H->bb/cc/gg at 350 GeV
ee->qqvv"
ee->qqlv"
ee->qqll
CLIC workshop - CERN 5-2-2014
Marco Szalay
!9
TMVA - II
Hvv HZ, Z->ll HZ, Z->mumu"
HZ, Z->jets
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
ee->qqvv"
ee->qqlv"
ee->qqll
Marco Szalay
!10
BDTG Z -> jets
BDTG - Z->ll vs Z->jets
signal
background
We can separate signal and
background with a diagonal cut
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
BDTG Z -> ll
Marco Szalay
!11
H->bb
Btag jet1 + Btag jet2
Btag jet1 + Btag jet2
Flavor tagging
H->gg
Ctag jet1 + Ctag jet2
Btag jet1 + Btag jet2
Btag jet1 + Btag jet2
Ctag jet1 + Ctag jet2
Ctag jet1 + Ctag jet2
H->bb/cc/gg at 350 GeV
H->cc
CLIC workshop - CERN 5-2-2014
H->other
Ctag jet1 + Ctag jet2
Marco Szalay
!12
1
LHC HIGGS XS WG 2013
Higgs BR + Total Uncert
Higgs Branchings
WW
bb
gg
10-1
ZZ
cc
57% bb, 22.3% WW,!
10-2
8.5% gg, 6.2% ττ,!
Z
2.8% ZZ, 2.7% cc,!
-3
10
0.23% γγ, 0.02% μμ
µµ
10-480
For 125.5 GeV Higgs
boson:!
100
120
140
160
180
200
MH [GeV]
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
Marco Szalay
!13
H->gg & H->others
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Need clever ideas to disentangle these processes
•
Possibly an additional TMVA analysis - jet multiplicity - # charged particles -…
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
Marco Szalay
!14
Hvv Analysis
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Production ID 2028: Hvv inclusive, both HZ, Z->vv and WW fusion
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Need to disentangle them to get clean WW fusion
sample
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
Marco Szalay
!15
MC split ZH Strahlung &
WW fusion
Search for
vv with
primary e+/eas parents
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
Marco Szalay
!16
MC split ZH Strahlung &
WW fusion
Simple cut on missing energy (160 < missing E < 182)
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
Marco Szalay
!17
Conclusions
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Signal extraction with multiclass BDTG seems quite
promising. (Keeping in mind that ee->qqqq
background is missing).
•
Flavor tag works well with H->bb and H->cc,
separation between h->gg and background is in
progress.
•
Hvv inclusive sample: WW fusion are entangled
with Z Strahlung. Need to implement a 2component fit.
H->bb/cc/gg at 350 GeV
CLIC workshop - CERN 5-2-2014
Marco Szalay
!18

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