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G4MICE Tracker Reconstruction with High Efficiency and Resolution

Detailed analysis of 10,000 muons with 6mm beam in two trackers, featuring momentum and amplitude resolution, cooling measurements, energy and position reconstruction. Explore TrackerRec package with simulation to digitization to reconstruction process.

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G4MICE Tracker Reconstruction with High Efficiency and Resolution

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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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