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Kaon LT Meetings » mtg_22sep28.txt

Garth Huber, 09/30/2022 10:44 AM

 
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                Sept 28/22 PionLT/KaonLT Analysis Meeting Notes
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                -----------------------------------------------
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                           (Notes by GH and SJDK)
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                    Today: PionLT will be discussed first
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Please remember to post your slides at:
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https://redmine.jlab.org/projects/kltexp/wiki/Kaon_LT_Meetings
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Present:
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Regina - Nathan Heinrich, Stephen Kay, Garth Huber, Muhammad Junaid
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   Vijay Kumar, Ali Usman, Love Preet, Alicia Postuma
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Ohio - Jacob Murphy
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CUA - Richard Trotta, Tanja Horn
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CSULA - Emerry Mark Gunselman, Erika Gwin
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Glasgow - David Hamilton
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Jacob Updates
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-------------
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- HMS 6.8 GeV Optics Matrix
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   - Dipole starts saturating around 1500A, ~5GeV/c
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   - Q1 and Q2 will be saturating at this momentum, begins at a different
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     current for each quadrupole
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   - No uniform way to correct for this
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   - SHMS saturation is primarily in HB
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   - Optical Matrix fitting is split into two parts:
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        - Angles determined from Sieve Data (xptar,yptar)
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	- Length along target from Carbon Foil (ytar)
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   - +/- 8 cm Optics target is used in PionLT (different to KaonLT)
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   - Look at each foil individually, split into 5 different delta regions
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   - Plots of xpfp vs xfp, ypfp vs yfp Ys vs Xs 
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      - Focal plane and sieve plane (original and corrected)
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         - Corrected is post optimisation
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   - Did not correct for sieve hole 1
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      - ytar cuts too restrictive in pass 1, was cut out
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   - Tanja comment - Should add why we see what we see from the optics
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      - More description of why the shapes look like they do
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   - DocDB link - https://hallcweb.jlab.org/doc-private/ShowDocument?docid=1140
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      - Jacob's revious report
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   - Summary and status
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      - Found and corrected hard coded sieve script issues
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      - New batch submission script
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         - allows for easier switching of param files for different runs
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      - HMS carbon optics replayed
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         - 6.8 GeV first pass complete
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         - Ytar cuts too tight, missing sieve holes, need to redo
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	 - Plots shown of Left: 6.6matrix, Right: 6.8matrix 1st pass
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	   XPtar-XPtar_true +/-5mr spread
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	   YPtar-YPtar_true +/-2mr spread
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      - To do
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         - Rewrite scripts to not require hand drawn Ytar cuts, remove hard
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	   coding, and have different ROOT files for different foils
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         - 3D histograms for better FP cuts - Z axis is Ysieve, not #events
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         - Repeat carbon sieve 5.6 GeV and 5.9 GeV calibrations
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         - Delta calibrations for all beam energies
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         - SHMS calibration (need to meet w/Holly)
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   - Nathan - How are xptrue and yptrue being determined?
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         - Foil you're starting with, spectrometer angle, distance and sieve
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   - Garth - Earlier experiments used 5 foils rather than the 3 we have now, is
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     this better or not?
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      - 5 Foils in theory better, more ytar coverage if you have more foils
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         - Harder to resolve? Depends upon angle a bit
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         - info from DaveG: below 12 degrees, very hard to make out targets
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	   separated by a small amount
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Nathan Updates
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--------------
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- No updates, busy with comprehensive
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   - Next task on the list will be HGC/NGC Cherenkov
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      - Jacob may get to these first
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   - Jacob added a tasks page to the Redmine to keep track of this
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       https://redmine.jlab.org/projects/hall-c/wiki/Analysis_Tasks
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Junaid Updates
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--------------
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- Same as Nathan, busy prepping for comprehensive
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- Also plans to help with calibrations after comp exams
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Alicia Updates
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--------------
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- Beam Helicity analysis update
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   - Starting to look at beam asymmetry data from KaonLT
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      - Pions and kaons
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   - Will look at PionLT later
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      - Pions only
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      - Not enough data for kaons
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   - First results hopefully for ~Feb next year
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      - Potential paper next summer
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Richard Updates
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---------------
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- Bill's LT-sep code
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   - Compiling issues, working these through
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   - C++ and other small compiler issues
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   - Luminosity replay next
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Ali Updates
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-----------
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- HeeP Offsets
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   - Co-ordinated with Vijay on finalizing offsets
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      - Tentative plan developed
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         - Focus on P offsets for each spectrometer to begin with, hoping to
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	   get a reasonable trend
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	 - then do angle offsets in sequential order
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   - Question for Tanja
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      - Uncertainties on momentum offsets, how are they determined?
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         - Earlier work had P offsets on SOS
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         - Before staturation region, some points with large error bars
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- Other planned work
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   - Adding errors to Efficiency Calcs
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   - Will look at Target Boiling from Bill Henry as a temporary step
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   - Will discuss Proton absorption corrections w/Stephen
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Vijay Updates
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-------------
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- Looking at low Q2 lumi data
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   - Replayed data, no BCM calibration file (one generated from the scaler
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     replay) - needed to determine current cuts accurately
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      - Need this file for all events, not just a fraction of the run
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      - Needed to redo scaler replay and get new file
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      - Now redone, can take another look
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   - How to do this on the farm?
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      - It was already included previously, but was commented out or removed
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        from some scripts for online running
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      - Example:
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        https://github.com/sjdkay/UTIL_BATCH/blob/LTSep_Analysis_2022/Analysis_Scripts/ProtonLT.sh
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         - Lines 48 to 55, runs the scaler replay and runs the analysis to
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  	   generate the BCM file, moves the param file afterwards too
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Next meeting: Wed Oct 5 @ 9:00 Eastern/7:00 Regina/6:00 Calif
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   - KaonLT will start first next time
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