14-04-2011 14-04-2011 HEP HEP Conference Conference 1 NMSSM Higgs Search NMSSM Higgs Search 0 0 0 1 1 1 h 4 2 2 jets Search for neutral NMSSM Higgs Studies at 10 TeV, and with the 2010 data @ 7 TeV Jehad Mousa University of Cyprus ANNUAL MEETING OF THE HELLENIC SOCIETY FOR THE STUDY OF HIGH ENERGY PHYSICS April 14-16, 2011, University of Patras, Greece
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14-04-2011HEP Conference 1 NMSSM Higgs Search Search for neutral NMSSM Higgs Studies at 10 TeV, and…
HEP Conference 3 The benchmark points The lightest pseudoscalar higgs boson is rather light, and the lightest CP-even higgs has enough phase space for the decay into two pseudoscalar higgs boson, to be kinematically accessible. The BR for the decay is very large and this new channel is the dominant one. Concerning the further decay of the lightest pseudoscalars, there are two possibilities: – Either and the boson decays into a pair of b quarks or a pair of tau leptons, leading to and final states, – or and the dominant decay mode of the boson is into a pair of tau leptons, leading to final state.
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14-04-201114-04-2011 HEP HEP ConferenceConference 11
NMSSM Higgs SearchNMSSM Higgs Search
0 0 0
1 1 1h 4 2 2 jets
Search for neutral NMSSM Higgs
Studies at 10 TeV, and with the 2010 data @ 7 TeV
Jehad MousaUniversity of Cyprus
ANNUAL MEETING OF THE HELLENIC SOCIETY FOR THE STUDY OF HIGH ENERGY PHYSICS
April 14-16, 2011, University of Patras, Greece
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NNMSSMMSSM
The Next-to-Minimal Supersymmetric Standard Model (NMSSM) extends the MSSM by the introduction of a singlet superfield ( )
The NMSSM naturally solves the μ-problem of the MSSM.
The Higgs sector of the NMSSM contains (three CP-even bosons h1, h2, h3 and two CP-odd higgs bosons α1, α2) and two charged higgs bosons (h ).
S
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The benchmark pointsThe benchmark points
• The lightest pseudoscalar higgs boson is rather light,
and the lightest CP-even higgs has enough phase space for the decay into two pseudoscalar higgs boson , to be kinematically accessible.
• The BR for the decay is very large and this new channel is the dominant one.
• Concerning the further decay of the lightest pseudoscalars, there are two possibilities: – Either and the boson decays into a pair of b quarks
or a pair of tau leptons, leading to and final states, – or and the dominant decay mode of the boson is into
a pair of tau leptons, leading to final state.
01
40 50M GeV
01a
M
0 0 01 1 1h
0 0 01 1 1h
01
10M GeV
01
0 0 01 1 1 4 ,4h b 2 2b
01
10M GeV
01
0 0 01 1 1 4h
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Channels investigated and Channels investigated and associated backgroundassociated background
The signal process:
A Vector Boson Fusion: Two different types of scenarios are considered, depending on
Scenarios with are disfavored when LEP data for Z2b and Z4b final states are taken into account.
On the contrary, scenarios with are favored by the same data and can even account for 2σ excess observed in the Z2b final state in the vicinity.
0 01 1
2 ( 4.2 ) 2 .b b ba am m m GeV orm m
01
2 bam m
01
2 bam m
01
2 bam m
01
100h
M GeV0 0 01 1 1h a a 4 2 2 jets
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Channels investigated and Channels investigated and associated backgroundassociated background
higgs-strahlung: 0 0 01 1 1
ll
l
l ,bb,bbWh l a a
l ,bb,
0 0 01 1 1
l l ,bb,bbZh l l a a
l l ,bb,
0 0 01 1 1h a a 0
1h The decay, with produced in higgs-strahlung with leptonic decays of the W or Z boson, which can give a very clean and almost background free signal, is one of the most promising higgs decay channels according to the last investigation of phenomenological scenarios
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Channels investigated and Channels investigated and associated backgroundassociated background
* *Z / and W
Background processes: ZZjj and WZjj production:
TTbar production: t Wb
Zbbbar and Wbbbar production:
* *Z / and W
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Muon Identification Muon Identification
Muon Reconstruction
( ) ( )( )
T T
T
p RECO p MCp MC
Muons: “global muons”
PT Resolution
/
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Tau Identification Tau Identification
Tau Reconstruction
( ) ( )( )
T T
T
p RECO p MCp MC
Taus: particle-flow techniques “PFTau”
PT Resolution
/
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Missing Transverse Energy (MET)Missing Transverse Energy (MET)
The pfMET algorithm
PMET Resolution MET Resolution
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Total number of Taus and muonsTotal number of Taus and muons
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Mass ReconstructionMass Reconstruction
PTmiss
vμ
μ
a1 τ vτ
μhad
vμ
a1
h1
τ
vτ
had The mass and PT of the h are sufficiently large to give a considerable boost to its decay products. The directionof the a1, of the two τ, of the two μ, of the two hadron and of the three neutrinos are then nearly parallel. The missing transverse momentum originates exclusively from the neutrinos from the decay chain of the h. The masses of the final state leptons and the a1 are neglected compared to the typical mass of h1.
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Collinear ApproximationCollinear Approximation
1 2 1 2, , , ,
2 1 2 1 2, , , , , ,( ) ( )
x h y h y h x hmiss miss
x h y h y h y h x h x h
p p p px
p p E p p E
1 2 1 2, , , ,
1 2 1 2 1, , , , , ,( ) ( )
x h y h y h x hmiss miss
y h x h x h x h y h y h
p p p px
p p E p p E
1 2
1 21 2h h
a a
E Ex , x
E E
1 2, ,1 2 1 2
, , , , ,1 2
T h T hT a T a T h T h T miss
p pp p p p E
x x
2 21 2 1 2
2 2 21 2 2
1 2
( )
2
a a a a
h h h ha
m p p
m m mm
x x
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xx1 1 andand xx2 2 before before Muon-Tau SelectionMuon-Tau Selection
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ΔΔR and mass distributions between R and mass distributions between muon-muon-jetjet
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ΔΔR and mass distributions between a-aR and mass distributions between a-a
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Invariant mass of a and h using Invariant mass of a and h using Collinear Approximation Collinear Approximation
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Data and Monte Carlo Samples at 7 Data and Monte Carlo Samples at 7 TeVTeV
Data Run-range/Mu/Run2010A-Nov4ReReco_v1/RECO 136033-144114/Mu/Run2010B-Nov4ReReco_v1/RECO 146428-149442Trigger PathHLT_Mu9, HLT_IsoMu9, HLT_Mu11, HLT_Mu15, HLT_IsoMu13HLT_IsoMu9_PFTau15, HLT_IsoMu11_PFTau15
Sample Gen Events
σ (fb)(NLO)
MC Filter Efficiency
Skim Efficiency
693000 14.44 1 0.73440 01 1
0 0 01 1 1 4
9 , 120a h
h a aM GeV and M GeV
Monte Carlo
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