Data Analysis - Analysis task list

Analysis tasks

General guidance

• Don't wait for meetings - reach out for help if stuck
• Use the elog: https://hallcweb.jlab.org/elogs/XEM2/

Initial post-run tasks

• Finish Casey's thesis (Casey) (DONE)
  • Wrestle snake of Nadia's choice(PENDING)
• Clone online replay - create pass 1 repository --> all updates should go into this repository (COMPLETE)
• Verify standard.kinematics for HMS and SHMS
  • Check for target mass, duplicates, missing runs, correct energy (Casey) (COMPLETE)
  • Check angle pictures in CODA file (Penny and Nadia) (COMPLETE)
    • Angle pictures have been created and added to /mss/ (COMPLETE)
    • Correct angle values have been updated in standard.kinematics (Abhyuday) (COMPLETE)
  • Verify magnet settings (Burcu) (HMS COMPLETE) (SHMS COMPLETE)

• Check run lists against standard.kinematics and run sheets (Nadia - SHMS, Abhyuday - HMS) (HMS done, SHMS ongoing)

• Small replay update
  • Set angle and momentum offsets to zero (Dave G) (COMPLETE) - already zero when I looked
  • Add/verify that momenta and angles used in the analysis are written to report files (including any offsets) (Cameron) (COMPLETE)
  • Add pointing offsets used in hcana to report files (they're hard-wired!). (Casey) (COMPLETE)
  • Add more stuff to epics tree (helium target temperatures and pressures) (Dave G - def files) (COMPLETE): Note: target position only valid for runs starting from first helium running
  • Add target encoder to T and scaler tree (Dave G) (COMPLETE) Not easy to add to scaler tree (needs new code?). Added to T tree, but only valid after switch to He targets
  • Verify correct BPM calibration in replay (Dave G) (COMPLETE)
  • Use high-momentum HMS matrix element files where appropriate (Shujie) (PENDING) Useful optics info
  • Check fast raster calibrations have right sign (Tyler) (COMPLETE (it didn't))
  • Fix rootlogon.C to point to correct directory (Cameron) (COMPLETE)
  • Fix hms_shared.h bug that causes bcm's to not be loaded correctly (Cameron) (COMPLETE)

Tasks for pass1

• Calibrations
  • Beam energy (Dave G) (PENDING)
  • BCM calibrations (Zoe) (COMPLETE)
  • Reference time cuts (Abhyuday - HMS, Ramon - SHMS) (HMS COMPLETE, SHMS COMPLETE)
    • Check high and low rate settings spread over run period to view cut with and without large background. Cut files set per trigger (3/4, ELREAL, ELCLEAN).
  • Timing window cuts - divide by detector
    • HMS CER, DC, HODO, TRIG (Cameron) (CER/DC/HODO COMPLETE) (TRIG COMPLETE)
    • HMS CAL (Abhyuday) (COMPLETE)
    • SHMS CER (Zoe) (COMPLETE)
    • SHMS CAL, DC, HODO (Zoe) (COMPLETE)
    • SHMS TRIG (?) (PENDING)
  • Cherenkov calibrations (Sebastian & Cameron - HMS, Ryan - SHMS (NGCER)) (HMS COMPLETE)(SHMS PENDING)
    • One calibration used for all runs (apart from HV change). Check consistency by looking at calibration results for several runs over run period.
    • Run ranges need to be checked to compare when HV was changed for NGCER.
  • Calorimeter calibrations (Abhyuday - HMS, SHMS - Ramon) (HMS COMPLETE, SHMS PENDING)
    • SHMS/HMS - look at de-focused runs?
  • Hodoscopes - (Cameron - HMS, SHMS - Zoe, Burcu will help!) (HMS COMPLETE)(SHMS PENDING)
  • Drift Chamber - (Cameron - HMS, SHMS - Zoe, Burcu will help!) (HMS COMPLETE)(SHMS PENDING)
  • After calibrations, perform surveys for 1st replay (number PE, calorimeter resolution, track residuals) (PENDING)
• Run the analysis/production on the farm
  • SHMS: Burcu (PENDING)
  • HMS: Cameron/Tyler (PENDING)

Longer term tasks (towards cross sections/ratios)

• Target issues
  • Determine 3He and 4He density run-by-run from temperature and pressure
    • Compare density to time dependence of SHMS yield
  • Determine correction for 6Li/7Li by comparing to time dependence of SHMS

• HMS/SHMS acceptance checks
  • Elastics
  • HMS-SHMS comparisons
  • Check ytar acceptance with dummy + carbon

• Determine kinematic offsets, resolution
  • Offsets from single arm elastic (HMS COMPLETE CWC, AS check)
  • offsets from coincidence elastic
  • Elastic peak width (p-p_elas(theta)) (IN PROGRESS)

• Target boiling analysis
  • Scalers
  • Tracks (HMS COMPLETE CWC)
    • Ytar dependence
    • Impact of ytar dependence on cross sections/ratios

• Backgrounds
  • Pion backgrounds (HMS COMPLETE CWC)
  • Charge symmetric backgrounds (HMS COMPLETE CWC)

• Efficiencies
  • Determine/check efficiencies for all PID detectors
  • Trigger efficiency (include 3/4 efficiency)
  • EDTM - parameterize electronic dead time using EDTM + Computer dead time? Use EDTM run-by-run? (IN PROGRESS)

• General quality control (after efficiencies are in good place)
  • Yield vs run (for kinematics with many runs)
  • Visual inspection of handful of key quality control graphs

• Data MC comparisons
  • Generate normalized yields with all corrections
  • Generate MC yields using mc_single_arm + radiated cross section model
  • Generate RC tables using externals_all
  • Compare data/MC - iterate model as needed
  • Use multiple models to check systematic uncertainty
  • Check sensitivity to naive isoscalar correction in N/Z studies of EMC effect (use different parametrizations)