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Kaon LT Meetings » mtg_23sep07.txt

Garth Huber, 09/08/2023 05:32 PM

 
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                 Sept 7/23 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 - Garth Huber, Nathan Heinrich, Abdennacer Hamdi, Vijay Kumar, Alicia
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   Postuma
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CSULA - Konrad Aniol
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CUA - Richard Trotta, Tanja Horn
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JLab - Dave Gaskell
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Vijay Updates
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-------------
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Continuation of SHMS Hodoscope vs. Run number and vs. trigger rate studies
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- hodoscope 4 has much lower efficiencies than the other planes
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- most 3/4 planes have efficiency greater than 97% 
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- Garth: check the drop of efficient with respect to momentum (especially at
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  low momentum)
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Next steps
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- luminosity study, has started working on scripts
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Richard Updates
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---------------
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Luminosity scan follow-up from last week
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- relative yields vs current looks flatter for Carbon than LH2 
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- doing weighted linear fits now (including error bars)
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- Carbon Normalized Yield vs Current:
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  (0.17% +/- 4.3%)/100uA
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- LH2 Normalized Yield vs Current:
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  (7.90% +/- 1.8%)/100uA
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- discussion on "linear regression plots of boiling factor vs current"
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  - these gave different results, but we think that's due to a
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    misinterpretation of the text in CarlosY's thesis
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- concluded that the boiling in Carbon is negligible, and no additional
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  corrections to the data are required
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- the 7.9%/100uA factor above should be applied to LH2 data on a run-by-run
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  basis, depending on the average current for each run
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  - errors in the boiling factor will also have to be propagated, including
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    also the uncertainty in the BCM calibration
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Kinematic plots per t-bin
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- Fortran average kin script is working now
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Nathan Updates
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--------------
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Hodoscope calibrations
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- we thought they were done, but apparently Jacob never pushed his calibs to
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  GitHub, so all of the other detector calibrations done to date used online
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  hodo calib parameters
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- not only will the hodoscope calibrations have to be done/re-checked, but this
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  also means (unfortunately) that other detectors (particularly drift chambers)
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  will have to be rechecked
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- although a setback, it's good this was caught before we got too much further
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  in the analysis!
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- located Jacob's scripts and calib files in his working area on the ifarm
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  - SHMS hodo calibs are running now
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  - HMS: fighting some script issues
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- hoping that 3 time-walk calibs, a new one each time the hodoscopes were
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  turned off, will be sufficient
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- VP calib will be done once per beam energy (not sure what VP stands for,
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  though)
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NPS Run Coordinator duties
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- Nathan will do Jan 31-Feb 7/2024
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Alicia Updates
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--------------
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Q2-dependence of sigma_LT'/sigma_0 at fixed xB=0.415, 0.245
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- displayed next to CLAS-6,12 data
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- raw data only, no scaling applied to constant t or xB
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- Q2-dependence at each xB looks fairly flat within scatter of data
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- probably need to do a t-interpolation of data to a fixed value (right now
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  just have data within a specific t-range)
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- Alicia: It would be nice to have a model to compare the data to, will run
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  PARTONS
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Garth Offset Studies
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--------------------
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Out-of-Plane
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- following procedure on pages 105-106 of Tanja's thesis
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- obtained BPM-y and SHMS,HMS Matrix Element info from Richard to compute phi
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  offsets
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- out-of-plane study reveals large out of plane offsets, probably unphysical
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- DaveG suggests to check the reverse of the Y-axis, i.e. Pp/Pe instead of
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  Pe/Pp, as the figure in the thesis might be mis-labeled
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In-Plane
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- received preliminary info from Richard for 6191, 8209, 10585 MeV Heep Coin
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  data
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- tried a global fit of in-plane offsets for 8 beam energies, and compared
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  results to last week's fit for 5 beam energies
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- angle and momenta offsets are generally comparable, although residuals are
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  significantly larger for some higher beam energy data
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- probably have to let HMS momentum offset float for settings where P>5 GeV/c
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- waiting for Richard final data before continuing study of in-plane offsets
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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 12 @ 15:00 Eastern/13:00 Regina/12:00 Pacific
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- PionLT will go first
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- we will use this time until the end of October, when USA goes off daylight
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  savings time
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- until then, we have to be sure to let Nathan to go earlier, as he has to
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  leave for TA work no later than 14:15 Regina time
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