TtH(H bb) AOD-Based Analysis And DPD maker Simon Dean University College London ATLAS-UK Top...

ttH(Hbb) AOD-Based Analysis And DPD maker

Simon DeanUniversity College London

ATLAS-UK Top Physics Meeting 17/09/2008

Simon Dean ATLAS-UK Top Physics Meeting

17/09/2008

ttH(Hbb) AOD-Based Analysis And DPD Maker 2

• PhysicsAnalysis/HiggsPhys/HiggsAssocTop/TtHHbbDPDBasedAnalysis

• Developed with help from Atlas ttH group– Lead developers: SD, Lily Asquith (UCL)– Various testers

• Runs cut-based analysis a la CSC note HG5• Can write out DPDs

– D2PD: another input for Athena/ARA analysis– D3PD: flat ntuple– Content to be agreed upon


17/09/2008


ttH Analysis ToolttH Analysis Tool

TtHHbbToolBaseTtHHbbToolBase

IAnalysisTools IAnalysisTools

RescaleTool RescaleTool

TruthMap TruthMap

LikelihoodTool LikelihoodTool

ChiSquared ChiSquared

TrackIsolationTool TrackIsolationTool

Reco::ITrackToVertex Reco::ITrackToVertex

JetChargeTool JetChargeTool


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TtHSelection

BTaggingToolPreselectLeptonsFindSoftLeptonsPreselectJetsAssociatorBTagEfficiencyWlvToolWjjToolTtbarRecoToolHiggsRecoTool

• TtHSelection is the main Algorithm– Schedules

tools for doing specific analysis tasks


17/09/2008


Cone4H1TowerJets

BTaggingToolStoreGate

•B-tagging splits jets into separate collections•Possible Atlfast-I Calibration

AllJets

BJets

LightJets


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ElectronAODCollection

StacoMuonCollection

PreselectLeptonsStoreGate

•author=1 or 3.•pT>25 GeV, ||<2.5•IsEM & 0xFF == 0ET(tracks dR<0.2)/pT < 0.15

•author=1•pT>20 GeV, || < 2.5•Fit 2/ndof < 30ET(cells dR<0.2)/pT < 0.3•d0VTX < 0.05mm

HardElectrons

HardMuons

Muons

Electrons

Require 1 hard lepton per event


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FindSoftLeptons

•not hard electron•not within dR<0.1 of other soft electron •4GeV < pT < 100 GeV, || < 2.5ET(cells dR<0.2)/pT > 0.1

•author=1 or 2•not hard muon•not within dR<0.1 of other soft muon (keep best 2/ndof)•4GeV < pT < 100 GeV, || < 2.5•Fit 2/ndof < 30ET(cells dR<0.2)/pT > 0.1

ElectronAODCollection

StacoMuonCollection

StoreGate

HardElectrons

HardMuons

SoftMuons

SoftElectrons


17/09/2008


PreselectJets

•At least 6 Jets –pT> 20 GeV, || < 5–Electron/jet overlap removal:

–dR(e,j) < 0.2–pT(e)/pT(j) > 0.75–Keep electron, discard jet

–Add soft muons (dR < 0.4)•At least 4 central jets

–|| < 2.5–weight(SV1+IP3D) > 0.

StoreGate

AllJets

HardElectrons

SoftMuons

PreselectedLightJets

PreselectedBJets


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WlvTool

•Constrain invariant mass of lv to W mass, solve for pzv•If no solution, use collinear approximation: pzv = pzl

MET_RefFinal

StoreGate

HardElectrons

HardMuons

LeptonicWs


17/09/2008


WjjTool

•Pairs of jets with mjj=mW±25GeV

StoreGate

PreselectedLightJets

HadronicWs


17/09/2008


TtbarRecoTool

Reconstruction of 2 top quarks•Consider all b-jet pairs•Make all possible permutations with Ws•Minimise 2 with top masses

•Reconstructed top masses must be within ±20GeV of mt

2 b-jets left over are the Higgs

StoreGate

PreselectedBJets

LeptonicWs

HadronicWs

HadronicTops

LeptonicTops

BestHiggs

222

GeV0.13GeV0.19tjjbtlvbmmmm


17/09/2008


Validation of DPDMaker (C. Collins-Tooth)

• Comparison to CSC preselection performed on CSC MC (v12) – for ttH(H->bb) sample 5871, tid8658, file #2 (250 evt):

• For now, solely for validation:– Turned off soft muon addition to jets for both CSC and

DPD-based analysis.– Turned off jet Pt corrections in both CSC and DPD-based

code.– Turned off trigger in DPDMaker ‘preselection’ for

historical reasons as this was not applied until the very end of the ‘preselection’ in the CSC note!

• NB: required the use of – IsolationTool-00-00-18-01– TrackIsolationTools-00-00-12-01


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Preselected Leptons• Pt for events having just one lepton

• Soft muon Pt (not yet added to jets)

DPDMaker CSC Analysis

DPDMaker CSC Analysis


17/09/2008


Preselected Lepton with Jets

• Numbers verified for both DPDMaker and CSC:– A= 79 events having 1 preselected lepton, 4jets (with |

eta|<2.5 and bJetWeight>0)– B= 59 events having A + 6 jets in total(Pt>20,eta<5)– C=49 events with B + trigger (e25i || e60 || mu20i).

• Now need to verify the rest of the analysis (i.e. after preselection) and include soft muons and jet Pt Corrections.


17/09/2008


Status and plans• Running in 14.2.20• No ttH samples available yet, tested on FDR2c

– No truth– No b-tagging

• Much more extensive testing to come• Validation against CSC results will continue• Currently, DPD maker writes out subset of AOD

collections as a preselection– Perhaps keep collections from latter stage of analysis?– Discussion / familiarisation ongoing

TtH(H bb) AOD-Based Analysis And DPD maker Simon Dean University College London ATLAS-UK Top...

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