Sept 28/22 PionLT/KaonLT Analysis Meeting Notes
                -----------------------------------------------
                           (Notes by GH and SJDK)

                    Today: PionLT will be discussed first

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

Present:
Regina - Nathan Heinrich, Stephen Kay, Garth Huber, Muhammad Junaid
   Vijay Kumar, Ali Usman, Love Preet, Alicia Postuma
Ohio - Jacob Murphy
CUA - Richard Trotta, Tanja Horn
CSULA - Emerry Mark Gunselman, Erika Gwin
Glasgow - David Hamilton

Jacob Updates
-------------
- HMS 6.8 GeV Optics Matrix
   - Dipole starts saturating around 1500A, ~5GeV/c
   - Q1 and Q2 will be saturating at this momentum, begins at a different
     current for each quadrupole
   - No uniform way to correct for this
   - SHMS saturation is primarily in HB
   - Optical Matrix fitting is split into two parts:
        - Angles determined from Sieve Data (xptar,yptar)
	- Length along target from Carbon Foil (ytar)
   - +/- 8 cm Optics target is used in PionLT (different to KaonLT)
   - Look at each foil individually, split into 5 different delta regions
   - Plots of xpfp vs xfp, ypfp vs yfp Ys vs Xs 
      - Focal plane and sieve plane (original and corrected)
         - Corrected is post optimisation
   - Did not correct for sieve hole 1
      - ytar cuts too restrictive in pass 1, was cut out
   - Tanja comment - Should add why we see what we see from the optics
      - More description of why the shapes look like they do
   - DocDB link - https://hallcweb.jlab.org/doc-private/ShowDocument?docid=1140
      - Jacob's revious report
   - Summary and status
      - Found and corrected hard coded sieve script issues
      - New batch submission script
         - allows for easier switching of param files for different runs
      - HMS carbon optics replayed
         - 6.8 GeV first pass complete
         - Ytar cuts too tight, missing sieve holes, need to redo
	 - Plots shown of Left: 6.6matrix, Right: 6.8matrix 1st pass
	   XPtar-XPtar_true +/-5mr spread
	   YPtar-YPtar_true +/-2mr spread
      - To do
         - Rewrite scripts to not require hand drawn Ytar cuts, remove hard
	   coding, and have different ROOT files for different foils
         - 3D histograms for better FP cuts - Z axis is Ysieve, not #events
         - Repeat carbon sieve 5.6 GeV and 5.9 GeV calibrations
         - Delta calibrations for all beam energies
         - SHMS calibration (need to meet w/Holly)
   - Nathan - How are xptrue and yptrue being determined?
         - Foil you're starting with, spectrometer angle, distance and sieve
   - Garth - Earlier experiments used 5 foils rather than the 3 we have now, is
     this better or not?
      - 5 Foils in theory better, more ytar coverage if you have more foils
         - Harder to resolve? Depends upon angle a bit
         - info from DaveG: below 12 degrees, very hard to make out targets
	   separated by a small amount

Nathan Updates
--------------
- No updates, busy with comprehensive
   - Next task on the list will be HGC/NGC Cherenkov
      - Jacob may get to these first
   - Jacob added a tasks page to the Redmine to keep track of this
       https://redmine.jlab.org/projects/hall-c/wiki/Analysis_Tasks

Junaid Updates
--------------
- Same as Nathan, busy prepping for comprehensive
- Also plans to help with calibrations after comp exams

Alicia Updates
--------------
- Beam Helicity analysis update
   - Starting to look at beam asymmetry data from KaonLT
      - Pions and kaons
   - Will look at PionLT later
      - Pions only
      - Not enough data for kaons
   - First results hopefully for ~Feb next year
      - Potential paper next summer

Richard Updates
---------------
- Bill's LT-sep code
   - Compiling issues, working these through
   - C++ and other small compiler issues
   - Luminosity replay next

Ali Updates
-----------
- HeeP Offsets
   - Co-ordinated with Vijay on finalizing offsets
      - Tentative plan developed
         - Focus on P offsets for each spectrometer to begin with, hoping to
	   get a reasonable trend
	 - then do angle offsets in sequential order
   - Question for Tanja
      - Uncertainties on momentum offsets, how are they determined?
         - Earlier work had P offsets on SOS
         - Before staturation region, some points with large error bars
- Other planned work
   - Adding errors to Efficiency Calcs
   - Will look at Target Boiling from Bill Henry as a temporary step
   - Will discuss Proton absorption corrections w/Stephen

Vijay Updates
-------------
- Looking at low Q2 lumi data
   - Replayed data, no BCM calibration file (one generated from the scaler
     replay) - needed to determine current cuts accurately
      - Need this file for all events, not just a fraction of the run
      - Needed to redo scaler replay and get new file
      - Now redone, can take another look
   - How to do this on the farm?
      - It was already included previously, but was commented out or removed
        from some scripts for online running
      - Example:
        https://github.com/sjdkay/UTIL_BATCH/blob/LTSep_Analysis_2022/Analysis_Scripts/ProtonLT.sh
         - Lines 48 to 55, runs the scaler replay and runs the analysis to
  	   generate the BCM file, moves the param file afterwards too

Next meeting: Wed Oct 5 @ 9:00 Eastern/7:00 Regina/6:00 Calif
   - KaonLT will start first next time