June 7, 2017, Production & Analysis Working Group

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Meeting Time and Place

The meeting will be on Wednesday June 7, 2017 at 2:00 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] 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.

Reconstruction & Analysis Studies Status


  1. Announcements
  2. Data Production
  3. Analysis Focus
  4. This Week's Studies
  5. Any other studies
  6. 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. Calibration Update --- Sean Dobbs
  2. Monitoring Update --- Thomas Britton
  3. Processing Update --- Alex Austregesilo
    • Status of the last Spring 2016 production launch
    • Preparing for the first Spring 2017 production launch
  4. Comparison of pass-3 and pass-4 of Spring 2016 --- Curtis Meyer

Analysis Focus: Total Cross Sections

  1. J/Ψ, φ --- Lubomir
  2. η, ρ, ω, φ --- Simon
  3. φ --- Thomas xsec results update
  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

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: 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: 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



  • There are some outstanding issues with the room reservation for this meeting. Paul M. can address this when he's back tomorrow.

Data Production

  1. Sean gave an update on calibrations. Essentially all calibrations for the first production launch are in. Higher-statistics calibrations done by Mark Dalton have significantly improved the BCAL time resolution. One final monitoring launch is needed for final checks.
    • Sean and Alex A. are working in consultation with Sandy to avoid Lustre usage problems at JLab.
  2. Alex A. updated on the status of data processing.
    • The good half of the spring 2016 data has been processed as "ver04". An analysis launch was immediately done for the spring 2016 data, which finished except for 2 jobs, which are currently being finished.
    • Another spring 2017 monitoring launch was started today, hopefully it will finish before the CC outage tomorrow.
    • Mark I. brought up that he had anecdotally heard that the current reconstruction ran a factor ~3 slower than previously. Simon had been looking into this, and replied that part of the difference was that we are reconstructing 8 particle hypotheses now instead of 8, but with the current alignment and calibration, we are also throwing away fewer tracks than we had before.
  3. Curtis showed a quick comparison of the eta pi+ pi- final state between ver03 and ver04 of the Spring 2016 data. After at 10% kinematic fit CL cut, there are ~30% more events in the ver04 data.
    • Simon stated that this agrees with the increased number of reconstructed tracks that he saw.

Analysis Focus: Total Cross Sections

  1. Simon reported that Thomas and he agreed on a looser kinfit CL cut of 10^-5 to compare their results. He is currently studying the results of simulations to understand the efficiencies with this cut.
  2. Thomas showed some intermediate results on his phi -> K+K- cross sections from Spring 2016, which include an improved treatment of the tagger. The cross sections vary more gradually, although there still appears to be an issue with the TAGH/TAGM boundary. He is looking into the reason for the lower cross sections at higher energy and will look at the new reconstruction of the data.
    • Matt suggested to use realistic angular distributions for the phi, which could make a large difference in this channel.
    • Sean suggested to look into using an average TOF inefficiency for simulation to better match data.

Studies: Hit Efficiencies

  1. Alex Austregesilo compared FDC psuedohit efficiencies between the two reconstruction passes, and found that the overall efficiency stayed near 90%, but varied more evenly over packages.
    • Sean suggested to check these with simulations. Alex A. reminded that we need better handling of cathode half strips in simulation.
  2. Elton reported that Mark D. is working on updating calibrations for the simulation with the same procedures used on the data.
  3. Jon is working on updated shower efficiencies for next week. He mentioned that he sees ~3x more combinations in his omega -> 3pi w/ missing photon analysis in the latest reconstruction.
    • Matt reminded us that he has a new graduate student at work using the LED data to obtain block-level efficiencies.