Aug 24/23 PionLT/KaonLT Analysis Meeting Notes
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                              (Notes by GH & AH)

                     Today: KaonLT will be discussed first

Please remember to post your slides at:
https://redmine.jlab.org/projects/kltexp/wiki/Kaon_LT_Meetings

Present
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Regina - Garth Huber, Muhammad Junaid, Vijay Kumar, Nacer Hamdi
JLab - Dave Gaskell
CUA - Richard Trotta
CSULA - Konrad Aniol

Richard Updates
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Finalizing the luminosity studies
- trying to reproduce PeterB's LH2 boiling study
   - that study used yield from ELCLEAN scalers, for Q2=5.5, W=3.02,
     high-epsilon data
   - applying strict current cuts, and subtracting EDTM from ELCLEAN scaler
   - PB said he got a 0.3%/100uA correction
   - confusing results on relative yields, while using ELCLEAN yields

- shows old plot of HMS Rel Yield vs Rate (LH2 lumi scan data)
   - Yields: Carbon looks good, but hydrogen have some outliers, discussion on
     reducing the error bars
   - DG: probably best to only consider kinematics where pi- are below HMS
     Cerenkov threshold
      - consider to eliminate P_HMS=6.2, 5.7 GeV/c data
      - recheck pi- leakthrough for 4.2 GeV/c data, and adjust Cer cuts

- request to Vijay where new fortran scripts are for average_kinematics and yields

Vijay Updates
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Low Q2 efficiencies & livetime
- tracking eff vs S1X looks good
- EDTM-LT vs. SHMS-3/4 trigger rate
  - LT fairly flat >99% until ~3 kHz, then linear drop

- SHMS-3/4 trigger eff vs rate
  - observe ~97% efficiency for low rate (forward angle) runs, and 99% for most others
  - DG: check the first runs that show weird low efficency, they may be low
    momentum, or different conditions
    - the problem with getting this trigger eff directly from hcana is that
      it requires some study
    - depends on matching of paddle hits w/ track, needs turning of slop
      parameter in the match
    - would generally expect SHMS-3/4 >99%
      - *look* at S1X,Y,S2X,Y planes separately
      - S2Y are vertically-oriented quartz bars, could be less efficient at
        lower momentum
      - *plot* each plane efficiency vs. SHMS_momentum to see if it's a real
        effect, or not

Junaid Updates
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HMS calorimeter calibs
- finished HMS calorimeter calibration for 2021
- still woring on pionLT run 2022
- new faster method: ran sripts on all 2021 data, and ran script to find
  deviation and whether a new calib is needed
  - expecting 2022 to be done soon, then will move on to SHMS calor calibs, for
    negative polarity data only

Garth discussion on Heep Offsets
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Reviews Ali's out-of-plane offsets study from 23-May-18
- plots mean xptar difference between data and SIMC using formula in Tanja thesis
- HMS has a larger shift than SHMS, contributes most of the offset
- reproduces Ali's plot, where it is unclear whether the 3.8 or the 6.2,8.2
  data are outliers
- GH getting data from Vijay's Summer-2019 Heep study to add to Ali's plot,
  this will hopefully shed light on the issue

Reviews Vijay's in-plane offsets study from 23-Aug-17
- in-plane offsets should be largely independent of out-of-plane offsets
- DG: can let beam energy float within the quoted uncertainty on ARC energy
  measurement
- DG: did Vijay do a global chi-square minimization?
  - no, each energy was done separately
  - GH will write a program that includes the derivatives and Vijay's input
    data and do a global minimization

Next Meeting
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- Thur Aug 31 @ 16:00 Eastern/14:00 Regina/13:00 Pacific
- PionLT will go first