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Thesis Preparation LTPPM : January 2009 .... Stage LPC 2009 : 2 months (LIA & ILCP)

My Thesis Project. Study of the Top Quark Properties and Effect of New Physics. Thesis Preparation LTPPM : January 2009 .... Stage LPC 2009 : 2 months (LIA & ILCP) Stage LPC 2010 : 4 months (LIA & ILCP) Stage CERN : ....2 months. +. (90%).

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Thesis Preparation LTPPM : January 2009 .... Stage LPC 2009 : 2 months (LIA & ILCP)

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  1. My Thesis Project Study of the Top Quark Properties and Effect of New Physics Thesis Preparation LTPPM : January 2009 .... • Stage LPC 2009 : 2 months (LIA & ILCP) • Stage LPC 2010 : 4 months (LIA & ILCP) • Stage CERN : ....2 months

  2. + (90%) (10%) The Quark Top at LHC Production of tops pairs SM: Decay Full hadronic Channel semi-leptonic Channel di-leptonic Channel Branching Ratio

  3. Stage LPC:22 Mai-5 Aout 2009 • Familiarization with the ATLAS software environment : Athena, ROOT. • beginning of an analysis: - ttbar full hadronic channel (tt → Wb Wb → qqb qqb) - production of events • reconstruction of events with 0b-tag: study of jets combinations methods : Meth1:  select the two W light jets :   Min χ2 = Σ (Mjj-Mw) 2 / б2    to associate the to good top : choice Mt1-Mt2 minimum      Meth2: Meth1 + remove all jets combinations with Pb <Pj1 <PJ2 in CMtopResults: choosing the right combination for W1 and W2 = 27%                   Choosing the right combination for t1 and t2 = 41%

  4. …..2010work Study of the ttbar events in the Semi-leptonic Channel ttbarResonances Search • Study of the electron and muon trigger efficiency with simulation (10 TeV) • Resuming the analysis "10TeV" for the study at 7 TeV (simulation data)GOALS: • Learning a complete analysis • Production of signal & BGs • Selection and reconstruction •  report

  5. Study of the trigger Efficiency Avalables Simulations • SM, Z '(500,700,1000,2000,2500,3000 GeV) MC => No trigger Information.   =>Assumptions: All SM events with 1 lepton pT> 20GeV must pass the  lepton trigger: (EF_e15_medium (e); EF_m15 (μ)) • New MC with SM Trigger Info => plots for trigger selected eventswith cutlepton Pt> 20GeV (μ)EF_m15 + cut pT>20 GeV (e)EF_e15_medium + cut pT>20 GeV

  6. Reconstruction of Events : tt→ Wb Wb → blטbjj(2b-tag) • Tops Reconstruction T_had-> 3jet W_had = two light jets the closest in ΔR top_had = W_had and b-jet closest ΔR T_lept: W_lept = lepton + MET + pz constraint on MW_PDG Top_lept = W_lept+ bjet • Reconstruction improved for energetic tops (T_hadwith less than 3jet)               (M_jet_Max = the highest mass of the jet in the evt) •  if M_jet_Max <65 GeV T_had-> 3jetsstandard reconstruction • if 65 <M_jet_Max<130 GeV T_had-> 2jetsT_had isthe jet_max & jet the closest in ΔR • if M_jet_Max > 130 GeV T_had-> 1jetT_had is the jet with the highest mass

  7. SIGNAL Z’reconstructed Reconstruction Of Events : tt→ Wb Wb → blטbjj ttbar mass reconstructed from different samples of BGs.

  8. Stage CERN: Octobre…2010 study of Uniformity in Φ Of theTilecal QualificationWork

  9. Stage CERN: Octobre…2010 • First study of uniformity from an available Ntuple (isolated tracks)   (in progress)- Selection of isolated tracks (ΔR = 0.4)- Determination of the entry point of the track in the module- Calorimetric energy deposited (ΔR = 0.1 around the track direction)- Distribution of the energy deposited in function of Tile Module N°.

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