Realistic tracking resolution from Nicolas
- EPIC
- tracking evaluated at r =70 cm with all sub detectors
- with TOF
- DIRC@EIC, EPIC
- 3-layer spherical lens with sapphire, r=[62,36]
- 3 mm pixels HIQ400, CE=95%
- pions and kaons @ 6 GeV/c; phi = 0 (no field); vertex y-shifted by 0.5*barwidth (to hit middle of the bar)
- 100 ps time precision
- geometrical reconstruction with averaged LUT from 15M photons
- GR with per-PMT and chromatic corrections
- 20k tracks for pdf generation (per each particle species) (generated with 0.5 mrad track resolution); 5k for determining separation
Tracking resolution:
Interpolated map for polar angle:
Zoomed:
Interpolated map for azimuthal angle:
Zoomed:
Smearing in particle's CS (old way of smearing) vs global CS (new). Particle's CS smearing with theta = 2.2 mrad (results plotted in global CS):
G4ThreeVector vec(0, 0, 1); vec.setTheta(theta); vec.setPhi(phi); G4ThreeVector vec0 = vec; vec.setTheta(G4RandGauss::shoot(theta, fTrackingRes)); vec.rotate(2 * M_PI * G4UniformRand(), vec0.unit());
Global CS smearing with theta and phi = 2.2 mrad (results are in global CS):
G4ThreeVector vec(0, 0, 1); vec.setTheta(G4RandGauss::shoot(theta, fTrackingRes)); vec.setPhi(G4RandGauss::shoot(phi, fTrackingRes));
Performance plots for pi/K @ 6 GeV/c:
Photon yield after GR:
Photon yield after TI:
GR:
TI:
Performance plots for pi/e @ 1.2 GeV/c:
Photon yield after GR:
Photon yield after TI:
GR:
TI:
Event display of 2.2 mrad smearing in theta and phi(@ 30 deg):
Event display of 4 mrad smearing in theta and 16 mrad smearing in phi (@ 30 deg):
=> smearing track at the vertex with large resolutions is not representative as it also leads to too much smearing of the hit position on radiator