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Kaon LT Meetings » mtg_23aug24.txt

Garth Huber, 08/24/2023 06:35 PM

 
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                 Aug 24/23 PionLT/KaonLT Analysis Meeting Notes
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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 - Garth Huber, Muhammad Junaid, Vijay Kumar, Nacer Hamdi
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JLab - Dave Gaskell
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CUA - Richard Trotta
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CSULA - Konrad Aniol
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Richard Updates
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---------------
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Finalizing the luminosity studies
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- trying to reproduce PeterB's LH2 boiling study
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   - that study used yield from ELCLEAN scalers, for Q2=5.5, W=3.02,
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     high-epsilon data
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   - applying strict current cuts, and subtracting EDTM from ELCLEAN scaler
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   - PB said he got a 0.3%/100uA correction
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   - confusing results on relative yields, while using ELCLEAN yields
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- shows old plot of HMS Rel Yield vs Rate (LH2 lumi scan data)
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   - Yields: Carbon looks good, but hydrogen have some outliers, discussion on
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     reducing the error bars
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   - DG: probably best to only consider kinematics where pi- are below HMS
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     Cerenkov threshold
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      - consider to eliminate P_HMS=6.2, 5.7 GeV/c data
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      - recheck pi- leakthrough for 4.2 GeV/c data, and adjust Cer cuts
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- request to Vijay where new fortran scripts are for average_kinematics and yields
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Vijay Updates
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Low Q2 efficiencies & livetime
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- tracking eff vs S1X looks good
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- EDTM-LT vs. SHMS-3/4 trigger rate
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  - LT fairly flat >99% until ~3 kHz, then linear drop
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- SHMS-3/4 trigger eff vs rate
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  - observe ~97% efficiency for low rate (forward angle) runs, and 99% for most others
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  - DG: check the first runs that show weird low efficency, they may be low
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    momentum, or different conditions
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    - the problem with getting this trigger eff directly from hcana is that
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      it requires some study
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    - depends on matching of paddle hits w/ track, needs turning of slop
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      parameter in the match
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    - would generally expect SHMS-3/4 >99%
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      - *look* at S1X,Y,S2X,Y planes separately
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      - S2Y are vertically-oriented quartz bars, could be less efficient at
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        lower momentum
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      - *plot* each plane efficiency vs. SHMS_momentum to see if it's a real
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        effect, or not
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Junaid Updates
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HMS calorimeter calibs
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- finished HMS calorimeter calibration for 2021
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- still woring on pionLT run 2022
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- new faster method: ran sripts on all 2021 data, and ran script to find
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  deviation and whether a new calib is needed
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  - expecting 2022 to be done soon, then will move on to SHMS calor calibs, for
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    negative polarity data only
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Garth discussion on Heep Offsets
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Reviews Ali's out-of-plane offsets study from 23-May-18
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- plots mean xptar difference between data and SIMC using formula in Tanja thesis
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- HMS has a larger shift than SHMS, contributes most of the offset
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- reproduces Ali's plot, where it is unclear whether the 3.8 or the 6.2,8.2
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  data are outliers
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- GH getting data from Vijay's Summer-2019 Heep study to add to Ali's plot,
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  this will hopefully shed light on the issue
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Reviews Vijay's in-plane offsets study from 23-Aug-17
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- in-plane offsets should be largely independent of out-of-plane offsets
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- DG: can let beam energy float within the quoted uncertainty on ARC energy
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  measurement
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- DG: did Vijay do a global chi-square minimization?
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  - no, each energy was done separately
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  - GH will write a program that includes the derivatives and Vijay's input
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    data and do a global minimization
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Next Meeting
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- Thur Aug 31 @ 16:00 Eastern/14:00 Regina/13:00 Pacific
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- PionLT will go first
(271-271/412)