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## Plan of Teaching

1. Road Map (e+e- final pair spectra from NN, NA, AA -> e+e-X reactions)
2. PID standard cuts e+/e- reconstruction algortithm (`HPidAlgStandCuts`)
• Algorithm description
• Input parameters (`HPidAlgStandCutsPar`) - description
• How to run PID with `HPidAlgStandCuts` in HYDRA framework
• Input (`HPidTrackCand` data category, input parameters `HPidAlgStandCutsPar`)
• Output (`HPidParticle` data category, control PID ntuple)
• Exercises (`HPidAlgStandCutsPar` paramter container)
• Initialise `HPidAlgStandCutsPar` parameter container from ORACLE and store it in ROOT file (runID=7006)
• Draw parameter histograms stored in `HPidAlgStandCutsPar`
• Exercises (control PID ntuple with C+C@2GeV events)
• Make q*p vs. cut number plots
• Determine purity and efficiency of e+/e- standard cuts reconstruction algorithm
3. Dielectron (e+e- pair) reconstruction (NN, NA, AA -> e+e-X)
• Dielectron signal and combinatorial background (CB) reconstruction
• CB reduction strategy definition of direct and recursive cuts
• How to run e+e- pair analysis in the HYDRA framework
• `HPairFiller` and `HPairFilter` reconstructor classes
• Input parameters (`HPairCutPar`) - description
• Output (`HPair` data category, control `HPairFilter` ntuple)
• Exercises (HTree with `HPair` category with C+C@1AGeV events)
• Draw `HPair` data members using TBrowser
• Exercises (control `HPairFilter` ntuple with C+C@1GeV events)
• Draw invariant mass, opening angle, transverse momentum and rapidity plots for unlike-sign and like-sign pairs
• Draw invariant mass spactra for unlike-sign and like-sign pairs as the function of direct and recursive cuts
• Calculate dielectron signal `S = N(e-e+)-CB (CB = N(e+e+)+N(e-e-))` after recursive cuts