Welcome to the Kaon-LT Wiki Page¶

• Our meetings take place every 3-4 weeks over BlueJeans

Notes from Meeting February 22, 2018¶

• Discussion of Andres's slides on elastic W calculation in hcana - initial issue with negative W values seems to be due to outdated information in standard.kinematics file. Additional investigation ongoing.
• Brief description of Samip's work - working on coincidence timing decoding with JLab staff and re-optimization of kinematics
• Discussion of Richard's slides on run plan kinematics and preparations -
  • everyone agrees that in general want to have as many L/T cross section separations as possible in a robust run plan balancing statistics vs. systematics
  • before actual run may want to do a 3D optimization in all kinematic variables to get the best possible delta(epsilon) for the L/T separations
  • for each setting will need 1-2 shifts for calibrations - need to negotiate with other experiments in run group
  • kinematics plots W-Q2 show that still need to do some optimization
  • run sheets: include raster size, update coincidence count labeling, and carbon target labeling
• Discussion of next meeting. Garth at JLab 8-16 March - might have meeting during that time.

• Action Items:
  • Post slides/notes from this meeting and procedure to set up hcana in Redmine (Tanja)
  • Update run sheet and kinematic optimization for W/Q2 (Garth)
  • Circulate elastic calculations for kinematic settings (Samip)
  • Continue investigation of elastic data and run plan kinematics (Andres/Richard)
  • Test software installation instructions (Pete)
  • Draft email to JLab management about need for small angle beam pipe - need to have HMS minimum angle of less than 13 degrees for kaon L/T separations (Tanja)

Notes from Meeting March 29, 2018¶

• Details of adding points to fall run plan - will be ready sooner, likely in week of 4/1 (Garth, Samip, Tanja)
• Luminosity scans (Ryan, Andres, Richard, Pete)
• Macros, SIDIS analysis (Hem, Anashe)
• Elastic data (TBD)

Notes from Meeting April 26, 2018¶

• Discussion luminosity scan analysis (earlier scan) - Richard
  • Shown is a scaler-based analysis using scalers from report file and from ROOT tree - the values are different, why that is has to be checked
  • Notes on efficiencies in report file:
    • DT (EDTM) is not electronic deadtime. Instead use for now 50ns* trigger rate for HMS and 100ns* trigger rate for SHMS
    • Cherenkov efficiency seems low (check if that is due to PID, thresholds, pi/e, etc)
    • Tracking efficiency needs to be checked
    • 3/4 trigger efficiency seems ok
• Discussion luminosity scan analysis (later scan) - Ryan
  • Fewer carbon runs than earlier scan
  • Shown is a tracking-based analysis using data from the ROOT trees
  • First results for carbon, LH2, and LD2, but efficiencies need to be checked
• SIDIS analysis - Hem
  • Shown is a data/MC comparison for different kinematic settings. Agreement in shape is very good. Normalization has yet to be applied.
  • Discussion about agreement in z and apparent offset - relation of this offset with spectrometer offset
• Analysis of exclusive events in SIDIS - Samip
  • Shown is a look at the first kaon events in exclusive limit of SIDIS data
  • Ongoing work on implementing coincidence time into tree
• Discussion of run plan, and in particular possible low Q2/low energy
  • Assume that kaon low Q2=0.4 already included - have kinematics with specified beam energies, if needed
  • For pion form factor and LT, have two possible settings that can use the prescribed beam energies: Q2=1.45 and 0.35 GeV2 - prioritize towards the higher Q2 as not as sensitive to offsets
  • Garth will put this together in a draft email