SoLID Ecal Weekly 20231005

Update on MIP study

Ye's slides [1]

• To clean up the MIP data sample:
  • Baseline shift correction
  • Gain shift correction (based on MIP height)
  • Fix 40ns as the integral TW in the decoder
  • SC_A & SC_D trigger efficiency is very low at ~3%, in order to get pion dominant samples, we need to apply Shower_{i}/ShowerSum>0.8+ 200 ADC<preshower<500 ADC cuts.
  • The conclusion is that the MIP peaks we looked at are indeed MIP peaks, there is no confusion about that.

Pion rejection study

Mike's slides

• comments from the meeting:
  • get the correct bg-mixing method from Zhiwen
  • for data, add calibration of Sh vs. PS using MIP positions and the simulated Edep of MIP.
  • use simulation to study whether there are low-energy electrons in the data pion sample. The plot of "SH+PS sum" suggests there are, because it looks like a small MIP peak sitting on top of a larger low-energy tail.