May 3, 2017, Production & Analysis Working Group

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Meeting Time and Place

The meeting will be on Wednesday May 3, 2017 at 1:00 pm EDT. For those people at Jefferson Lab, the meeting will be in room F326.

Meeting Connections

  1. To join via a Web Browser, go to the page [1]
  2. To join via Polycom room system go to the IP Address: ( 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.

Reconstruction & Analysis Studies Status


  1. Announcements
  2. Collaboration Meeting May 15-17, 2017
  3. Data Production
  4. Analysis Focus
  5. This Week's Studies
  6. Any other studies
  7. Upcoming Study Schedule

This Week's Topics

  • Talks: Summary/overviews only. Detailed discussions should be held in the appropriate working groups.
  • Talks should be limited to 10 + 5 minutes.

Data Production

  1. Monitoring Update --- Thomas Britton
  2. Calibration Update --- Sean Dobbs
  3. Preparing for the last Spring 2016 production launch
  4. Preparing for the first Spring 2017 production launch
  5. Processing Update --- Alex Austregesilo

Analysis Focus: Total Cross Sections

  1. J/Ψ, φ --- Lubomir
  2. η, ρ, ω, φ --- Simon
  3. φ --- Thomas
  4. ω --- Christiano
  5. Any others?

Studies: Hit Efficiencies

(i.e. Is the detector working?) Updates on experiment, simulation, and the comparison between the two.

  1. CDC Hit Efficiencies --- Naomi Jarvis
  2. FDC Hit Efficiencies --- Alex Austregesilo
  3. BCAL Hit Efficiencies --- Elton Smith
  4. FCAL Hit Efficiencies --- Jon Zarling

Data Production Milestones

  1. Produce Spring 2016 "gold runs" as soon as alignment is ready
  2. Fri. May 5 - Finalize calibrations/software for low-rate running. Run final tests.
  3. Mon. May 8 -- Fri. May 12 (?) - Scicomp tape library down
  4. Fri. May 12 - Start production for low-rate running.
  5. Fri. May 19 - Finalize calibrations/software for high-rate running. Run final tests.
  6. Fri. May 26 - Start production for high-rate running.

Upcoming Study Schedule

  • Updates on experiment, simulation, and the comparison between the two.
  • Summary/overviews only. Detailed discussions should be held in the appropriate working groups.
  • All talks should be limited to 10 + 5 minutes.

Next Week: Alignment & Track/Shower Efficiencies (i.e. Is the reconstruction working?) Updates on experiment, simulation, and the comparison between the two.

  1. Drift chamber alignment --- Mike Staib
  2. Tracking Efficiencies --- Paul Mattione
  3. BCAL Shower Efficiencies --- Elton Smith
  4. FCAL Shower Efficiencies --- Jon Zarling

Week after next: Studies: Other Updates on experiment, simulation, and the comparison between the two.

  1. Track / Hit Matching: BCAL, FCAL, TOF, SC --- Paul Mattione, Simon
  2. Efficiencies: TOF, SC --- Beni, Mahmoud
  3. Means & Resolutions (time, energy, dE/dx): Tracking, BCAL, FCAL, SC, TOF
  4. Uncertainties: PID (BCAL, FCAL, TOF, dE/dx), Kinfit (BCAL, FCAL, tracking)
  5. Channel/Analysis Studies: Branching ratios, cross sections, SDMEs, beam asymmetries
  6. Other reconstruction/analysis issues

The following week: Studies: Beamline & Triggering

  1. Flux --- Justin
  2. Beam energy --- Beamline Group
  3. Polarization (TPOL & lineshape) --- Beamline Group
  4. Beam Asymmetries --- Alex Austregesilo
  5. Trigger emulation --- Alex Somov
  6. Triggering efficiency --- Alex Somov


Data Production

  1. Sean reported that only a few calibrations are left to be done for the 2017 data. The high-level BCAL calibrations are being checked and finalized. An ongoing monitoring run will produce the results needed for a few more calibrations that need higher statistics.
  2. Alex A. reported that a monitoring launch on the 2017 was started yesterday with 5 files per run; if time remains before next week's shutdown of the tape library, 5 more files will be run as well. A final 2016 monitoring run is needed as well.

Analysis Focus: Total Cross Sections

  1. Thomas is working on improving the stability of his fits, ~50% finished.

Studies: Hit Efficiencies

  1. Naomi presented some results on the CDC hit efficiency
    • She is taking a bottom-up approach and started looking at hits that don't get added to tracks. It appears as though ~17% of all CDC hits are attached to time-based tracks, as opposed to 40% of CDC hits which look ot be roughly in time. Other systematics were seen, e.g., saturated hits were generally not being added to tracks.
      • Paul M. pointed out that for spiralling tracks, only hits in the last rotation are used
      • Simon and Mike S. pointed out that the selections used at the track-candidate level are fairly loose, while the time-based tracking is more aggressive in how it prunes hits from being used in the fit
    • She also looked at some data/simulation comparisons. The hit time distributions in data and simulation are very different - these can be updated. The pulse amplitude distribution for tracks at theta ~ 90 degrees looks fine, but the data distribution for all tracks is broader.
      • It would be useful to look at simulations that include realistic noise. Thomas will update his wrapper to be used offsite and will provide more information on how to use it and get at the background noise samples.
      • Sean pointed out that the focus should be on comparison with HDGeant4
  2. Matt reported that Jon Z. is focussing on FCAL shower efficiencies, currently the devil is in the details and he and Matt are working out the systematic effects in his method.
    • A new graduate student in the group will be working on using the LED monitoring data to determine block-level efficiencies which can then be integrated into the simulation.