fully hadronic top anti-top decay (using topview) fully hadronic top anti-top decay (using topview)...
DESCRIPTION
Fully Hadronic Top Anti-Top Decay 3 Estimated cross section ttbar: 800 pb Luminosity: 1fb -1 tt 6jets events: (in first year of running) IntroductionIntroduction t t 6 jetsTRANSCRIPT
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay(Using TopView)(Using TopView)
Ido Mussche
NIPHAD meeting, Februari 9th :
2
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Outline Outline
1___ Introduction to Research Subject 2___ Analysis: TopView 3___ Some results 4 ___ Outlook
3
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Estimated cross section ttbar: 800 pb
Luminosity:1fb-1
tt 6jets events:35000 (in first year of running)
Introduction Introduction
t t 6 jets
4
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Introduction Introduction
t t 6 jets
Research subject:- Optimize fully hadronic signal- Investigate and map background- Compare with semi-leptonic channelOffline in cooperation with online trigger (Menelaos)
5
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Analysis Analysis RDO
ESD
TopView
AOD
AANtuple
Analyze with Ntuple data
Histos
AlgorithmConfiguration
Add yourown stuff
AnalysisResults
HistosOr SmallNtuple
Histos
AANtuple
6
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Analysis Analysis TopView:
Collection of common tools for top group built around EventView framework Starting point for implementing analysis or use as NTuple dumper tool Includes C++ tools and Python modules
C++ : Variable calculator (TruthLabeller, Total Invariant mass)
Python: Inserters (Reco, Truth), Analysis (W reconstruction, Top reconstruction), Matching (Truth to Reco and Reco to Truth)
https://twiki.cern.ch/twiki/bin/view/Atlas/TopView
7
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Analysis Analysis Levels of customization in TopView:
•Use default top JobOptions file (change/include ntuple variables, include analyses)
•Make your own top jobOption using existing python modules and C++ tools, creating your own analysis
•Write your own python modules
•Write your own C++ tools
8
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Analysis Analysis Step 1: Insertion and kinematics calculation
ElectronMuon
ParticleJet (b-tagged)
Truth
AOD
Insertion and overlap removal
Insert objects in order, remove
particles in same region
Kinematics calculation
Loop over Final State Objects, calculate
kinematics, add prefix and dump in User Data
TopViewFinal State Objects
Electron ParticleJet (b-tagged)Muon Truth
User Data
Inferred Objects
El_p_T Mu_EPJet_eta EtMiss
9
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Analysis Analysis Step 2: Combine jets to W and calculate variables
TopViewFinal State Objects
User Data
Inferred Objects
HadronicWReconstruction_module.py:EVSimpleCombo/HadronicWMaker( Labels[“ParticleJet”] OutputLabel[“HadronicW”] NDaughters[2] LowMass[60] HighMass[100])
Hadronic W
Electron ParticleJet (b-tagged)Muon Truth
El_p_T Mu_EPJet_eta EtMissHadW_p_T HadW_m
10
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Analysis Analysis Step 3: Find closest b-jet to W and combine to top TopView
Final State Objects
User Data
Inferred Objects
TopReconstruction_module.py:EVGeneralCombo/TopMaker( Labels[“W”, “ChosenBJet”] OutputLabel[“TopLabel”] NDaughters[2] LowMass[0] HighMass[10000])
Loop over Ws and find+label closest B-Jet
Electron ParticleJet (b-tagged)Muon Truth
Hadronic WTop
El_p_T Mu_EPJet_eta EtMissHadW_p_T HadW_m
11
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Analysis Analysis Step 4: Calculate top variables, match with truth, and create AANTuple TopView
Final State Objects
User Data
Inferred Objects
Electron ParticleJet (b-tagged)Muon Truth
Hadronic WTop
El_p_T Mu_E HadTop_NPJet_eta EtMiss HadTop_mHadW_p_T HadW_m HadTop_Tru_m
12
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Results Results
Mean should be 175 GeV
Reconstructed top mass fitted with simple
Gaussian for 10000 events
All results are extracted from:Csc11.005204.TTbar_FullHad_McAtNlo_Jimmy.recon.AOD.v11004205
13
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Results Results 3269
161 GeV
Reconstructed mass split up in matched (fitted with Gauss) and unmatched (fitted with Landau)
From 20000 tops only 3269 matching are found.
14
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Results Results
Total reconstructed fitted with convoluted Gauss + Landau
15
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Results Results Re
co –
True
(e
ta)
True (eta)
16
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Results Results Re
co –
True
(p
T)
True (pT)
17
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Extra plotsExtra plotsRe
co –
True
(p
T)
True (eta)
18
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Extra plots Extra plots Re
co –
True
(e
ta)
True (pT)
19
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Future goals Future goals
Optimize hadronic top reconstruction:•Map background•Check jet energy scale calibration•Compare with semi-leptonic channel•Kinematic fit
20
Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay
Extra plots Extra plots