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Kaon LT Meetings » mtg_23sep19.txt

Garth Huber, 09/20/2023 12:52 PM

 
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                Sept 19/23 PionLT/KaonLT Analysis Meeting Notes
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                 -----------------------------------------------
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                              (Notes by GH & AH)
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                     Today: KaonLT 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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-------
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Regina - Ali Usman, Alicia Postuma, Muhammad Junaid, Garth Huber, Nacer Hamdi,
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   Nathan Heinrich, Vijay Kumar
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JLab - Dave Gaskell
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FIU - Pete Markowitz
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CUA - Richard Trotta, Tanja Horn
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Richard
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-------
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LT-sep code
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- Included the script for re-calculating SIMC weights for each iteration
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  (converted C script from Vijay/Bill into python)
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   - Garth: Very important to check your script wth some tests
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Cleaning up outstanding items before starting LT-sep iterations
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- Garth: produce table of systematics on different efficiencies, to see if
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  anything's missing or not sufficiently understood
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- Need to add HGC geometrical cuts into SIMC
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- Heep offsets
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  - please rerun a Heep Coin setting with new offsets to see if they work
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    - *in-plane*: hopefully just a matter of making sure the offset is
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      implemented with correct sign, check improvement between Data and MC
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      distributions
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    - *out-of-plane*: Garth is concerned about large errors on the off-plane
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      offsets as they seem unphysical.  Looking at xptar distributions with the
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      offsets included will tell us much!
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- Ionization energy loss correction in SIMC
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  - hcana does not correct events for energy loss, so we want corrected_eloss=0
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    flag in SIMC to do the same thing
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  - if the SIMC recon script is used, get the same W values
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       corrected_eloss = 0
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          recon_hcana-> W=9.433e-1
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          no recon_hcana-> W=9.423e-1
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       corrected_eloss = 1
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          recon_hcana-> W=9.433e-1
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          no recon_hcana-> W=9.395e-1
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     this is because the recon script recalculates the energy without eloss on
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     its own, rather than relying on previous value
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Next steps
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- test weight recalculation script
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- make an uncertainties table
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- add HGC geometrical cuts in SIMC
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Vijay
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-----
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No update.  Focusing on the thesis writing this week
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Next steps
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- Continue luminosity study
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- Hodoscope efficiencies (in report file) with PID cut added
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- rerun Heep Coin SIMC so GH can determine in-plane offsets for Low Q2 data
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Nathan
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------
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Hodoscope calibs for HMS/SHMS
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- time walk correction w/ extra runs added
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- time walk correction should stable over many runs for both HMS and SHMS
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  - need to clear some outliers, between runs 15000-16000, which could be
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    either low stats runs or runs where the fits failed
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  - some PMTs have a bit of a time trend
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    - Run 14777 is the break between Winter 21-22 and Summer 22 runs.  Planning
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      to divide data into two groups at this point
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Next steps
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- hodoscope signal propagation time correction
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  - should be similarly stable to time walk
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Junaid
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------
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- working on other things, mostly waiting on Nathan to finish hodoscope calibs
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  - will recheck DC calib after hodoscope done
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  - can help Nathan with some hodoscope checks after new time walk uploaded
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Alicia
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------
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3 unresolved questions in BSA analysis:
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- optimal cut on Aerogel NPE
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- random CoinTime windows
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- MM cut variation for cut-dependence study
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- Aerogel NPE vs. Coin time plot showed before and after PID cuts
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  - with MM and Calorimeter cuts applied, the 2D plot looks clean
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    - 3 NPE cut looks good
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  - without these cuts applied, the proton/Kaon contamination is more evident
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    - 3-4 NPE cut looks fine
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- Aerogel NPE vs. missing mass plot shows clear two bands, with some background
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  <3 NPE
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- planning to apply a 3 NPE cut
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- Coin time shows clear accidentals, using 4 side bands to subtract background
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  - as a reminder, these 10.6 GeV data have the worst CT resolution
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  - Q2=3 shows some contamination as a wider width on right side of prompt peak
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    - possibly a cut was not applied correctly, will re-check
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  - these plots do not have MT target subtraction
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Ali
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---
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- no report, leaving for Pakistan tomorrow
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  - compared standard.kinematics and SIMC input files for all KaonLT HeepCoin
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    and they are in good agreement
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Next Meeting
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------------
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- NOTE THE NEW TIME AND ZOOM CONNECTION INFO!
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- Tues Sept 26 @ 15:00 Eastern/13:00 Regina/12:00 Pacific
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- PioonLT will go first
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Join Zoom Meeting
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https://uregina-ca.zoom.us/j/94470211297?pwd=djBROEdWUENLUTF3ZFN1c0kvS0VIQT09
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Meeting ID: 944 7021 1297
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Passcode: 320362
(292-292/412)