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Kaon LT Meetings » mtg_23jul06.txt

Garth Huber, 07/06/2023 06:24 PM

 
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                 July 6/23 PionLT/KaonLT Analysis Meeting Notes
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                 ----------------------------------------------
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                                (Notes by GH)
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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, Ali Usman, Muhammad Junaid, Nathan Heinrich, Vijay Kumar, 
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   Alicia Postuma
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CUA - Richard Trotta, Tanja Horn
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JLab - Dave Gaskell
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FIU - Pete Markowitz
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Ohio - Julie Roche
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CSULA - Konrad Aniol
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Richard Updates
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---------------
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Meeting with Peter Bosted is tomorrow at 13:00 Eastern
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   Zoom Mtg ID: 815 5260 0153
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   Passcode: 746974
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HGC cuts and efficiency calculations
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- applied one of Vijay's cuts, but it looks too small in comparison to hole in
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  NPE vs (x,y), the data are 10.6GeV, maybe the cut is for 8 GeV?
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  - Vijay drew several versions of the cuts, needs to look them up
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- Vijay thinks he drew the cut on Efficiency vs (x,y), not NPE 
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  - will look up older reports, and meet with Richard on this after meeting
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    with PeterB
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BCM calibrations
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- DG: PeterB doesn't use the most updated analyzer, it does not have Dave
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  Mack's high current non-linearity correction in it
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  - if you apply PeterB's BCM correction, you are double-applying the
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    non-linearity correction
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Ali Updates
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-----------
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- updated standard.database to read in proper BPM files for each run period
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- setting up scripts for LT-analysis
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  - want to finalize t-binning as Alicia needs this too
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    - needs diamond cuts to be applied first
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  - want to compare cuts w/ Alicia, should overall be similar, except for HGC
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    cut
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    - AP reminds us that she will do a HGC cut dependence study, but no HGC cut
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      will be used in the final results, as the asymmetries are very similar
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      but with larger errors
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  - running SIMC for pi+n, pi+SIDIS, pi+Delta0
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- working on offsets
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  - reran Heep singles w/ updated BPM, to give more data points at mid-HMS
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    momentum
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Vijay Updates
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-------------
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Working on HMS calorimeter efficiency study
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- DG had suggested plots vs p_HMS for fixed cut
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  Left: >0.2 cut  Right: >0.7 cut
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  Three data sets: p_HMS=0.448, 1.35 2.25 GeV/c
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  - efficiency is high and stable for >0.2 cut
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  - efficiency for >0.7 cut is very low at 0.448 GeV/c
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  - DG: apparently Dave Mack found that FADC threshold was set too high, caused
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    inefficient calorimeter regions for P<1 GeV/c
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    - had forgotten about this, now agrees that it's okay to use a lower cut
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      for low HMS momentum
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    - does Vijay have a calorimeter plots that we can look at
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      Yes, but needs a few minutes to find them
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Alicia Updates
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--------------
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Waiting on t-binning from Ali
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Working on PARTONS GPD library
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- sigl, sigt, siglt, etc are private functions only
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- modifying code to implement new classes to allow these cross sections to be
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  outputted
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  - since DEMP reactions are only recently implemented, unlike DVCS, only
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    asymmetries are output so far, and thinks it's likely the authors haven't
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    gotten around to doing this yet
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  - JR: suggest reaching out to the authors to see if they have any suggestions
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   or warnings on doing this
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- will have a tutorial next week on running PARTONS
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  - Julie is interested, we will circulate a Zoom link when it's scheduled
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Vijay (2)
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---------
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Shows plot of H_cal_Etottracknorm
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- looks very clean, no pion background even below <0.2 at 0.448, 1.35 GeV/c
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- applied cuts: HMS Cherenkov, CoinTime prompt peak
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  - DG: at these momenta, the TOF differences between pions and electrons are
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    large, we need to see what the plot looks like when accidentals are
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    included, as accidental coincidences cut could cause issues
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- Vijay will quickly replay one run so we can see the plot
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Nathan Updates
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--------------
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More work on SHMS HGC calibrations
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- more data points so we can see the trends in the data
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  - the decreasing trend up to run ~13900 looks to be real
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  - this apparently corresponds to when 7.9GeV beam began
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  - after this, the calibrations are stable all the way to the end of the 2022
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    run
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- suggests to take a constant calibration for all runs after start of 7.9GeV
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  beam to end of 2022
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  - for sloping part, fit calib data with a line and calculate middle value for
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    a setting
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  - TH: suggest two plateaus (beginning and end) and a linear part in between
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    PMTs 3,4 show the early plateau more clearly compared to PMTS 1,2
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- GH asks about some gaps in the plots
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 - plot shows calib setting by setting only, with point at the earliest run
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   number
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 - GH suggests that for settings taking longer than a day that the period be
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   sub-divided, and calculate from the linear trend for each period, maybe even
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   for each individual run number if that is easier to set up
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- Some discussion on what is causing the decreasing trend in the calibration
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  - we know the HV monitor was stable, so the PMT gain should have been stable
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  - JR: is the HGC signal going through a pre-amplifier?
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    - DG: for sure the NGC was, need to check about the HGC
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  - GH: please try to look at the hclog during the period while 9.2GeV beam was
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    being tuned (only a few shifts) and see if there is a log entry on if
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    anything was adjusted
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Junaid Updates
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--------------
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Updated DC calibs for both spectrometers
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- will post slides and sample plots (shown last week) on RedMine
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Working on HMS calorimeter
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- fixing path issues
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- hoping to see some plots next week
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Jacob
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-----
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- Julie informs us that Jacob is taking a medical leave of absence until
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  December
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  - we hope he is doing okay
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Vijay (3)
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Replay of one 2.2 GeV/c run is completed
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- plot w/o CoinTime cut shows small grass <0.2, with a minimum at 0.3 (on log
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  scale)
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- DG: agrees that a cut at either 0.2 or 0.3 is reasonable
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  - thanks Vijay for showing all of these plots on a short time scale
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Next Meeting
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- Thur July 13 @ 16:00 Eastern/14:00 Regina/13:00 Pacific
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- PionLT will go first
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