August 29, 2016, Analysis Working Group

Meeting Time and Place

The meeting will be on Monday August 29, 2016 at 2:00 pm EDT. For those people at Jefferson Lab, the meeting will be in room F224-225.

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Agenda

1. Announcements
   • Reconstruction Launch
2. Reconstruction Studies
3. AOB

Reconstruction Studies

Beamline

• Beam Polarization (Justin, Mike, Nathan)
• Beam Energy (Nathan, Richard)
• Flux (Justin)

Tracking

• CDC Efficiency (Mike)
• FDC Efficiency (Alex A.)
• Track Reconstruction (Simon)
• Tracking Means, Resolution, & Efficiency (Paul, Simon)

Calorimeters

• BCAL
  • Shower Clustering (Will)
  • Neutral Energy & Efficiency (Will)
  • Hadronic Energy & Efficiency (Elton)
• FCAL
  • Neutral Energy & Efficiency (Jon)
  • Shower Clustering (Matt)
  • Hadronic Energy & Efficiency (Matt)

Particle ID

• SC Efficiency (Mahmoud)
• TOF Efficiency (Beni)
• Particle ID (Paul, All) Run Browser

Channel Reconstruction, Triggering, Acceptance

• Triggering Efficiency (Alex S., Elton)
• ρ (Alex A., Justin) [2][3][4]
• ω→3π (π⁰ in BCAL, FCAL, both) [5] (Mike S.)
• φ→2K (Alex B.) [6]
• Charged 4π (Alex A.) [7]
• Anti-proton -- Proton photoproduction [8](Reinhard)

Minutes

• Reconstruction launch:
  • Improvements to BCAL non-linear corrections coming in soon
  • BCAL Covariance matrix will be ready soon
  • Simon working on FDC track finding improvements

• Beamline:
  • Beam polarization: Mike Dugger has preliminary TPOL polarization data, will have more soon
  • Flux: Justin is trying to get the tagged flux, working out tagging efficiencies
  • Beam Energy: Fixing the sign discrepancy helped, but there appear to still be more issues. We lined it up manually in the CCDB for the reconstruction launch.

• Tracking:
  • FDC: Recon efficiency much better now: Psuedo hit efficiencies improved from 70% to 90%, 10% more tracks reconstructed now
  • Preliminary efficiencies show issues in FDC in many-track events, will be discussed at tracking meeting.

• Calorimetry:
  • BCAL: For high energy Pi0's (e.g. > 6 GeV) the 2 photons are being merged together into a single shower half of the time
  • FCAL: Still working on timing calibration

• Analysis Channels:
  • Measured resolution is better for 1350 A, but kinfit resolution is about the same for both
  • Yields are higher for all channels (except rho) with 1350 A than 1200 A, cause unknown.
    • The yields for the rho are about the same for both field settings.
  • Will study by trigger type, and will study kinematics, to see where the change in yields might be coming from
  • Simon will look at single-proton + neutral channels to see if magnetic field shows a difference for those channels
  • Reinhard showed that a kinematic fit confidence level cut leaves a clean signal in the ppbar channel.
    • However, there appears to be a phi asymmetry generated by the cut. Justin suggests a looser cut on the kinfit confidence level