July 5, 2016, Analysis Working Group

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Meeting Time and Place

The meeting will be on Tuesday July 5, 2016 at 1:30 pm EDT. For those people at Jefferson Lab, the meeting will be in room A110.

Meeting Connections

  1. To join via a Web Browser, go to the page [1] https://bluejeans.com/115815824.
  2. To join via Polycom room system go to the IP Address: (bjn.vc) and enter the meeting ID: 115815824.
  3. To join via phone, use one of the following numbers and the Conference ID: 115815824.
    • US or Canada: +1 408 740 7256 or
    • US or Canada: +1 888 240 2560
  4. More information on connecting to bluejeans is available.


  1. Announcements
  2. REST Production Status:
    • First run block: 11347-11555 (complete)
    • Second run block: 11556-11678 (complete)
    • Third run block: 10331-10913 (complete)
    • Fourth run block: 11059-11346 (ready to start)
    • File tracking summary
  3. Future REST production calibrations
  4. Reconstruction Studies:
    • Schedule of presentations
    • CDC Efficiency: Mike
    • FDC Efficiency: Alex A.
    • FDC Reconstruction: Alex A.
    • BCAL Shower Clustering: Will
    • BCAL Hadronic Energy & Efficiency: Elton
    • BCAL Neutral Energy & Efficiency: Will
    • FCAL Shower Clustering: Matt
    • FCAL Hadronic Energy & Efficiency: Matt
    • FCAL Neutral Energy & Efficiency: Jon
    • SC Efficiency: Mahmoud
    • TOF Efficiency: Beni
    • Tracking Means, Resolution, & Efficiency: Paul, Simon
    • Beam Energy Scale: Nathan, Richard
  5. Other Studies:
  6. Analysis Launch Preparations:
  7. AOB


  1. REST Production Status:
    • Third run block: 10331-10913
      • Completed over the holiday weekend: 2 files failed repeatedly, log files available
    • Fourth run block: 11059-11346
      • Calibrations complete and ready for launch, expected to complete within a week
  2. Future REST production calibrations
    • Expect another production before the Fall 2016 run begins, and items for improvement have been discussed at the calibration WG meetings.
  3. Reconstruction Studies:
    • Schedule of presentations
      • The schedule for reports on the individual reconstruction studies begins next week with:
        • SC Efficiency (Mahmoud)
        • CDC Efficiency (Mike)
        • FDC Efficiency (Alex A.)
        • FCAL Neutral Energy & Efficiency (Jon)
  4. Other Studies:
    • A summary of rho beam asymmetry data Curtis
      • Curtis prepared a document compiling the world data on the Sigma beam asymmetry for rho photoproduction.
      • The uncertainties on these previous measurements are large and, as expected, aren't usable for absolute polarization normalization.
    • Beam Polarization: Justin, Mike, Nathan, Richard
      • The beam asymmetry observed for low energy rho production remains an open question
        • Richard is looking into alternative explanations for low energy polarization, and possible improvements on the assumption used in the literature
        • Ken L. added (by e-mail) that beam asymmetries using coherent bremstrahlung and laser backscattering at lower energy show good agreement, which provides some additional confidence in the CBSA method for the coherent peak region
        • Note: As requested the model used for the CBSA fits is CLAS Note 2011-20 by Ken L., where the parameters in the fit are defined at the end of Sec 2 (pg 7).
      • Studies are ongoing to include the tagger coincidence in the TPOL asymmetry results
  5. Analysis Launch Preparations:
    • Plugin Requirements
    • EventStore Readiness: Sean
      • Work is ongoing to utilize Richard's update the HDDM interface in EventStore.
  6. AOB