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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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- 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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