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Tracker Reconstruction

Timothy Carlisle Oxford. Tracker Reconstruction. Reconstruction in G4MICE. Simulate  Digitize  Reconstruct TrackerRec / package 4 or 5 point tracks ( Kalman fit) root files for each Tracker Station No TrackerRef Plane as yet Use station 1 as ref.  innermost stations.

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Tracker Reconstruction

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  1. Timothy Carlisle Oxford Tracker Reconstruction

  2. Reconstruction in G4MICE • Simulate  Digitize  Reconstruct • TrackerRec/ package • 4 or 5 point tracks (Kalman fit) • root files for each Tracker Station • No TrackerRef Plane as yet • Use station 1 as ref.  innermost stations

  3. Downstream Tracker Upstream Tracker Track Fitting Efficiency 99% 99% Inner station Inner station 10,000 muons 6mm beam Two Trackers, no material Step IV fields

  4. x Resolution • 10,000 events, e =6mm • Res. 0.7 mm at stations 1 & 2 • Res. ~1.2 mm at outer stations • Feature of fitting algorithm? Station 5 Station 1 10,000 muons 6mm beam Step IV fields

  5. Momentum Resolution Px Pz • (mcPx-TrkPx) ~ 1 MeV/c • (mcPz-TrkPz) ~3.7MeV/c 10,000 muons 6mm beam Step IV fields

  6. dE/dX? • Landau distribution is ~3 MeV wide • Ptotal resolution ~ 3.9 MeV/c • Pz res. the weak link • EMR / ToFs? Ptotal

  7. Transverse Amplitude • Single particle emittance • Useful for selection cuts • Beastly: • Calc. using mc trutha b g for beam envelope

  8. Amplitude Resolution • 0.3mm < DAmpSq< 0.8mm depending on the station • Unclear why sign change... Station 5 Station 1 (Inner) 10,000 muons 6mm beam Step IV fields

  9. [Crude] Cooling Measurements • 35cm LH2 • Calc. e at each station • Inner station  ref. plane • 4.5% cooling (mc truth) • TrkMC: 5.5% • TrkRec: 3.8% Emittance [mm] Black – mc [Virtual Planes], 98.5% Transmitted Green – Trk mc Blue – reconstructed 10,000 muons 6mm beam Two Trackers, LH2 Step IV fields Abs(mc – rec) < 50 for x, y, px, py

  10. Energy • few MeV loss due to stations • Rec. Energy ~ const. • Averaged for rec. tracks? Av. Energy [MeV] Black – mc [Virtual Planes] Green – Trk mc Blue – Trk reconstructed

  11. Summary • TrackerRec/  Station by Station output at present • Efficiency 98-99% • Position resolution dep. on station • At inner station: • Energy resolution ~ 4MeV • Beyond Landau width- use EMR / ToFs? • Amplitude resolution appears < 1mm • sDx, Dy~0.7mm • sDPx,DPy~ 1 MeV/c • sDPz~ 3.7 MeV/c

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