1. ttH(H  bb) AOD-Based Analysis And DPD maker Simon Dean University College London ATLAS-UK Top Physics Meeting 17/09/2008

2. ttH(H  bb) AOD-Based Analysis And DPD Maker 2 Simon DeanATLAS-UK Top Physics Meeting PhysicsAnalysis/HiggsPhys/HiggsAssocTop/T tHHbbDPDBasedAnalysis 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

3. 17/09/2008 ttH(H  bb) AOD-Based Analysis And DPD Maker 3 Simon DeanATLAS-UK Top Physics Meeting ttH Analysis Tool TtHHbbToolBase IAnalysisTools RescaleTool TruthMap LikelihoodTool ChiSquared TrackIsolationTool Reco::ITrackToVertex JetChargeTool

4. 17/09/2008 ttH(H  bb) AOD-Based Analysis And DPD Maker 4 Simon DeanATLAS-UK Top Physics Meeting TtHSelection BTaggingTool PreselectLeptons FindSoftLeptons PreselectJets Associator BTagEfficiency WlvTool WjjTool TtbarRecoTool HiggsRecoTool TtHSelection is the main Algorithm –Schedules tools for doing specific analysis tasks

5. 17/09/2008 ttH(H  bb) AOD-Based Analysis And DPD Maker 5 Simon DeanATLAS-UK Top Physics Meeting Cone4H1TowerJets BTaggingTool StoreGate B-tagging splits jets into separate collections Possible Atlfast-I Calibration AllJets BJets LightJets

6. 17/09/2008 ttH(H  bb) AOD-Based Analysis And DPD Maker 6 Simon DeanATLAS-UK Top Physics Meeting ElectronAODCollection StacoMuonCollection PreselectLeptons StoreGate author=1 or 3. pT>25 GeV, |  |<2.5 IsEM & 0xFF == 0  ET(tracks dR<0.2)/pT < 0.15 author=1 pT>20 GeV, |  | < 2.5 Fit  2 /ndof < 30  ET(cells dR<0.2)/pT < 0.3 d0VTX < 0.05mm HardElectrons HardMuons Muons Electrons Require 1 hard lepton per event

7. 17/09/2008 ttH(H  bb) AOD-Based Analysis And DPD Maker 7 Simon DeanATLAS-UK Top Physics Meeting FindSoftLeptons not hard electron not within dR<0.1 of other soft electron 4GeV < pT < 100 GeV, |  | < 2.5  ET(cells dR 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 < 30  ET(cells dR 0.1 ElectronAODCollection StacoMuonCollection StoreGate HardElectrons HardMuons SoftMuons SoftElectrons

8. 17/09/2008 ttH(H  bb) AOD-Based Analysis And DPD Maker 8 Simon DeanATLAS-UK Top Physics Meeting PreselectJets At least 6 Jets –p T > 20 GeV, |  | < 5 –Electron/jet overlap removal: –dR(e,j) < 0.2 –p T (e)/p T (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

9. 17/09/2008 ttH(H  bb) AOD-Based Analysis And DPD Maker 9 Simon DeanATLAS-UK Top Physics Meeting WlvTool Constrain invariant mass of lv to W mass, solve for p z v If no solution, use collinear approximation: p z v = p z l MET_RefFinal StoreGate HardElectrons HardMuons LeptonicWs

10. 17/09/2008 ttH(H  bb) AOD-Based Analysis And DPD Maker 10 Simon DeanATLAS-UK Top Physics Meeting WjjTool Pairs of jets with mjj=mW±25GeV StoreGate PreselectedLightJets HadronicWs

11. 17/09/2008 ttH(H  bb) AOD-Based Analysis And DPD Maker 11 Simon DeanATLAS-UK Top Physics Meeting 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 m t  2 b-jets left over are the Higgs StoreGate PreselectedBJets LeptonicWs HadronicWs HadronicTops LeptonicTops BestHiggs

12. 17/09/2008 ttH(H  bb) AOD-Based Analysis And DPD Maker 12 Simon DeanATLAS-UK Top Physics Meeting 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

13. 17/09/2008 ttH(H  bb) AOD-Based Analysis And DPD Maker 13 Simon DeanATLAS-UK Top Physics Meeting Preselected Leptons Pt for events having just one lepton Soft muon Pt (not yet added to jets) DPDMaker CSC Analysis DPDMaker CSC Analysis

14. 17/09/2008 ttH(H  bb) AOD-Based Analysis And DPD Maker 14 Simon DeanATLAS-UK Top Physics Meeting Preselected Lepton with Jets Numbers verified for both DPDMaker and CSC: –A= 79 events having 1 preselected lepton, 4jets (with |eta| 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.

15. 17/09/2008 ttH(H  bb) AOD-Based Analysis And DPD Maker 15 Simon DeanATLAS-UK Top Physics Meeting 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