SoLID Ecal Weekly 20230518

SoLID ECal Weekly May 18, 2023

Discussion on Tracking

• Presentation by Mike

[[1]]

Discussion on Simulation

• Presentation by Ye

Discussion on Cherenkov

• Presentation by Darren (simulation)
• Presentation by Tim (data)

Discussion on AI/ML for PID

• Presentation by Darren
• To do:

Discussion on Charged Particle PID Analysis Plan

(Xiaochao)

• Starting point: 18 deg runs:
  • TS1 = CerSum
  • TS2= SC-B. and. SC-D
  • TS3 = SC-A .and. SC-D → SC-C.and.SC-D.and.ShowerSum
  • TS4 = ShowerSum
• Select “center-hit” events:
  • use GEM projected position, check that the event has hits in all detectors of the trigger
  • use GEM tracking to select events that hit center of ECal
• Setup:
  • Obtain preshower and Shower MIP position, convert data to Edep (in MeV)
    • Preshower:
    • Shower:
      • weekly notes say MIP is about FADCint=400, Ye’s slide shows 40 MeV (check: 194*1.5mm*2MeV/cm=58 MeV? Reduction due to Birk effect?). So 1GeV electron → Edep=1GeV*20%sample=200 MeV= 5*40 MeV = 5 * 400 → 2000 in peak integral
      • from Ye’s slide, run 4780 threshold (120mV in TS4) shows up at FADCint=2000; MIP=400 int = 40 MeV Edep = 200 MeV momentum; so 2000 threshold (120mV) → 1 GeV electron; 180 mV → 1.5 GeV/c electron momentum
      • if clear correlation exists between Edep and electron energy, convert FADC peak integral to electron energy: 1 GeV electron energy = 2000 in peak integral
• PID:
  • use TS3 (or TS4?) compare Psh, Sh, and Cherenkov spectra with simulation
    • Trigger cuts need to be in simulation
    • could use 1 GeV energy (electron-energy equivalent) bin in ShowerSum (better using PSH+SH sum if calibrated)
    • apply Cherenkov cut to see if it makes sense, but I suspect we can’t use Cherenkov to define “clean” electron samples.
    • either with or without Cherenkov cut, apply 1D preshower cut, and 2D preshower+shower (normalized) cut, study electron efficiency and pion rejection.