Fully Hadronic Top Anti-Top Decay (Using TopView) Fully Hadronic Top Anti-Top Decay (Using TopView)...

Fully Hadronic Top Anti-Top DecayFully Hadronic Top Anti-Top Decay(Using TopView)(Using TopView)

Ido Mussche

NIPHAD meeting, Februari 9th :

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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

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Estimated cross section ttbar: 800 pb

Luminosity:1fb-1

tt 6jets events:35000 (in first year of running)

Introduction Introduction

t t 6 jets

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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)

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Analysis Analysis RDO

ESD

TopView

AOD

AANtuple

Analyze with Ntuple data

Histos

AlgorithmConfiguration

Add yourown stuff

AnalysisResults

HistosOr SmallNtuple

Histos

AANtuple

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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



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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

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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

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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


El_p_T Mu_EPJet_eta EtMissHadW_p_T HadW_m

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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


Hadronic WTop

El_p_T Mu_EPJet_eta EtMissHadW_p_T HadW_m

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Analysis Analysis Step 4: Calculate top variables, match with truth, and create AANTuple TopView

Final State Objects

User Data

Inferred Objects


Hadronic WTop

El_p_T Mu_E HadTop_NPJet_eta EtMiss HadTop_mHadW_p_T HadW_m HadTop_Tru_m

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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

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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.

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Results Results

Total reconstructed fitted with convoluted Gauss + Landau

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Results Results Re

co –

True

(e

ta)

True (eta)

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Results Results Re

co –

True

(p

T)

True (pT)

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Extra plotsExtra plotsRe

co –

True

(p

T)

True (eta)

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Extra plots Extra plots Re

co –

True

(e

ta)

True (pT)

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Future goals Future goals

Optimize hadronic top reconstruction:•Map background•Check jet energy scale calibration•Compare with semi-leptonic channel•Kinematic fit

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Extra plots Extra plots

Fully Hadronic Top Anti-Top Decay (Using TopView) Fully Hadronic Top Anti-Top Decay (Using TopView)...

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