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A quick look at global reconstruction of muon tracks in MC prod4 v9r7p5

A quick look at global reconstruction of muon tracks in MC prod4 v9r7p5. Paweł Przewłocki, Warsaw Neutrino Group (SINS Warsaw) May 2011 T2K meeting 17.5.2011. Introduction. Used monte carlo: prod4 neut, v9r7p5 (244 files), also mcp2 neut v8r5p11 for comparison (222 files)

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A quick look at global reconstruction of muon tracks in MC prod4 v9r7p5

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  1. A quick look at global reconstruction of muon tracks in MC prod4 v9r7p5 Paweł Przewłocki, Warsaw Neutrino Group (SINS Warsaw) May 2011 T2K meeting 17.5.2011

  2. Introduction • Used monte carlo: prod4 neut, v9r7p5 (244 files), also mcp2 neut v8r5p11 for comparison (222 files) • We take into account global reco tracks • We are looking at muon reconstruction quality, i.e. how many of muons get reconstructed, how many as highest momentum tracks etc. • We pick all truth primary muons that start in FGD FV, then • We look for matched reconstructed tracks (using TGlobalPID::TrueTrack) imposing different conditions (HM, FGD FV, etc) • No cut on matching Purity (TTrueParticle::Pur variable) • Used containers: ReconDir/Global, TruthDir/Trajectories

  3. How muon track reconstruction works • 60% of them does not have a segment in TPC (cannot be HM) Momentum and Cos Theta distributions for the above classes – see backup slides

  4. Spotted problematic tracks • Only true muons with true vertex in FGDFV selected • Distributions of reco starting points of reconstructed tracks associated with those true tracks shown z May be backward going, but...

  5. Problematic tracks (2) • Onlyrecotrackswith associatedtruetrackstarting in: FGD1 FGD2 forward backward FGD2 edge TPC2 edge z z FGD edges: 116-447, 1474-1807

  6. Tracks with reco z =0 (849 tracks) • Starting reco point (i.e. FrontPosition) at (0,0,0), the same with stopping point (BackPosition) • Reco momentum almost always 0; ~1/3 of these tracks have at least 1 TPC segment though • True vertices uniformly distributed within FGDs • Relatively low true momenta <p>~=450MeV • Usually perpendicular to the beam axis • About ¼ of those tracks do not exit FGD (i.e. the true track ends in the same fgd it was born in) true cos theta true momentum

  7. Reconstructed momentum For tracks that have at least one segment in TPC For tracks that have no segments in TPC reco momentum reco momentum

  8. Tracks from FGD1 at TPC2 edge (71 tracks) • Badly reconstructed cosine theta • Frequently overestimated reco momentum true cos true_mom-reco_mom reco cos

  9. Tracks from FGD1 at FGD2 edge (125 tracks) • Relatively high momentum, forward going tracks tracks traversing the tracker and stopping outside nd280 true momentum true stopping point probably lost connection with track in tpc2?

  10. Backup

  11. Statistics • Tracks not reconstructed at all – 2610(17%)

  12. Statistics • Tracks reconstructed, but not HM – 4687 (30%)

  13. Statistics • Tracks reconstructed and HM but reco vtx not in FGD FV – 1067 (7%)

  14. Statistics • Well reconstructed tracks in FGD FV – 7315 (47%)

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