Π polarizability Meeting Feb 24, 2021

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Meeting Time And Location

09:00 EST (JLab time) Weekly Meeting

REMOTE during Covid-19

Connecting

You can connect using BlueJeans Video conferencing (ID: 949 429 419). (Click "Expand" to the right for details -->):

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  2. Meeting ID: 949 429 419
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Action Items

Preliminary Agenda

  1. Previous CPP meeting: Feb 3, 2021
  2. Announcements
  3. Action Items
  4. CPP and NPP Readiness Review
  5. Data Analysis
  6. PID + AI
  7. Media:MWPC_issues.pdf ERR review of MWPC development
  8. Other business
  9. Next meeting

Minutes

Attending: Elton, Andrew, Beni, David, Ilya, Mark, Miskimen, Kishan?

  1. Previous CPP meeting: Feb 3, 2021
  2. Announcements
    • Elton: ERR Final Report has been received and posted to the ERR wiki page
  3. Action Items
  4. CPP and NPP Readiness Review
    • Meeting Ilya, Mark and David
    • Mark: All pieces to the simulation are in place but need testing. Elementary hit generation is also implemented. Mark, Ilya and Beni will start checking system, then coordinate with Richard
  5. Data Analysis (Andrew)
    • Andrew showed an update on the asymmetry of e+/e- pairs. Previously it was shown that there are more events at about -100deg compared to +100deg.
    • He checked in MC that no changes are seen if the photon beam is shifted. [There was some question if the analysis also moves with the beam position].
    • He changed the position of the electron on the collimator by 1 mm. This does create an asymmetry but with a much smaller size than that seen in the data.
    • Computing the asymmetry with 0deg and 90deg data sets removes most, if not all, of the asymmetry. It is likely the asymmetry is instrumental (detector acceptance?)
  6. PID + AI
  7. ERR review of MWPC development
    • Rory reviewed major recommendations relative to the MWPCs: efficiencies and rates
    • Prototype studies of small chamber guided decision to use Ar:CO2 90:10 mixture to decrease drift time
    • Efficiency plateaus were conducted for the prototype chamber in 2017
    • For pi/mu identification, need good calibration of the muon response in the MC.
    • Rory proposes to install scintillators behind the muon detector in order to measure the efficiency in situ for the MWPC 5 and 6. For this measurement, the proposal is to install both MWPC 5 and 6 with vertical wires and a vertical scintillator to tag muons.
    • Beni: Could install more than one scintillator. Suggests having the scintillator oriented the same as the wires and use the time difference from tubes at each end to determine position.
  8. Other business
  9. Next meeting
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