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Kaon LT Meetings » mtg_23jul27.txt

Garth Huber, 07/27/2023 06:24 PM

 
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                 July 27/23 PionLT/KaonLT Analysis Meeting Notes
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                 -----------------------------------------------
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                                (Notes by GH)
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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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-------
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Regina - Garth Huber, Muhammad Junaid, Vijay Kumar, Portia Switzer, 
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   Nathan Heinrich, Alicia Postuma
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CUA - Richard Trotta, Tanja Horn
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JLab - Dave Gaskell, Peter Bosted
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Ohio - Julie Roche
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CSULA - Konrad Aniol
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Junaid Updates
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--------------
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HMS Calorimeter calibrations
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- updated Cherenkov cut from 5->7 pe and delta cut now +/-8%
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- still getting wiggles in delta vs Edep/P at high delta
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- wiggles worse at 2.2 GeV/c than 3.8 GeV/c, but still present
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- DG: it looks like we're going to have to live with it, will have to make calor
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  cut a bit broader than otherwise, but #pi- is small anyways
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- PB: why are you calibrating run-by-run?  If you calibrate too much, you will
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  actually introduce a false dependence to the data
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  - better to look at the position and width of the calor peak and decide from
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    there whether its stable or need to re-calibrate
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  - if the efficiency of the E/P cut varies <0.1% it's good enough
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- DG: the calibration will change with momentum and rate (such as changing
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  target).  The PMTs are not optimized for high rate >100kHz
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- GH: expect we should only have to calibrate for every setting, as DG suggests
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  - can look at E/P for different sections of the focal plane (e.g. bin in 2%
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    delta), and look for changes corresponding to >0.1% cut efficiency change
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Nathan Updates
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--------------
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HGC calibrations
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- was away camping Sat-Wed, so not much done last week
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- HGC calib params vs Run#
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  - DG asked DMack his opinion, might have been due to too high rate on HGC
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    PMTs, leading to gain dep, suggests running at lower HV, particularly when
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    SHMS at very forward angle
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- param files will be put into standard.database
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- NH considering whether calib discontinuity synchronizes with a setting
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  change, and adjust the step functions accordingly
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  - many are associated w/5.5deg running, as DMack suggests
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  - NH hasn't made a final decision on this yet
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- JR: how did you choose which runs to analyze?
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  - each point is a whole setting, which is placed at the Run# corresponding to
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    middle of setting
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Next tasks (after HGC calib implemented & documented):
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- help JM w/ calor calib
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- also continue checks on standard.kinematics
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Vijay Updates
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-------------
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No report, was working on writing thesis (systematics chapter)
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- plans to get plots of TrackEff and other Effs before starting Lumi study
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- hopes to have these plots in 1-2 weeks
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Richard Updates
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---------------
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Editing Yield Calc code
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- lots of discussions w/Ali this week
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- adjusted code to do random & dummy subtractions for each (t,phi) bin
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Finishing up Geometric cut for HGC in SIMC
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- also Aerogel cut to select part of Focal Plane where aerogel actually is
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  (based on npe plot vs X,Y)
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- PB: please let him know the final aerogel cuts used, as he found that the
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  tray cut differs from the geometry info from Vardan
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Placing detector cuts in hcana/SIMC
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- PB: best to apply cuts to SIMC data, not in SIMC itself, turned all flag cuts
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  off, then placed a cut on calorimeter position (projected a few cm from the
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  front, not at the face location)
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- DG: In hallc_replay_lt there’s a cut 5 cm from the edge of the calorimeter
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  (top and bottom) and left and right.
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  - RT: Great, thanks Dave. So I really just need to uncomment it in SIMC and
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    should be set with calorimeter geo cuts
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  - DG: And check what the cut is in SIMC
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Alica Updates
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-------------
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It has been decided that AP and AU will have different t-bins
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- question is what kind of binning is needed?
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- we look at plots of sigLT' vs -t, and plots of BSA vs. phi
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- the asymmetry vanishes in parallel kinematics (-t_min) and grows with a
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  "square root like function" for (t-t_min)>0
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AP will try smaller -t bins near -t_min, will also look at reducing #phi bins
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- PB: uses 15 phi bins, someone convinced him earlier that an odd number of
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  bins is best, for low stats he uses 9 bins
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JR: how did the meeting with Pawel Sznajder (Nat.Cent.Nucl.Res. Poland) go on
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  PARTONS implementation?
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- we met last Friday.  Implementing cross section into the code framework is
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  less straightforward than the asymmetry, which is why it hadn't been done
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  yet, but it should be possible
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- showed him the discrepancy we see compared to prior calcs we received
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  directly from Kroll, he will investigate.  Prefers if he do the
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  implementation himself, rather than AP, so that the correct framework is
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  utilized.
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- told him there is a lot of interest in these calcs, would really want them
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  implemented in the official version, so we don't have to repeat it in next
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  version
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Portia Updates
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--------------
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DeltaPi MM spectra for Q2=4.4, center data for 6 phi bins
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- SIDIS MC overlaid on data, but the SIMC was not binned in phi
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- PB: you need to bin the SIMC events in exactly the same way as the Expt data
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  so that acceptance effects are taken into account
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- GH: treat data & MC in the same way for Left,Center,Right settings, fit SIDIS
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  and DeltaPi SIMC dists to the data (to get the shape) for each, and subtract
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  - only after the DeltaPi yield is found for each bin for Left,Center,Right
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    separately, do you combine them in an error-weighted average
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- AP: the plan will be to have MM plots with SIDIS and DeltaPi MC included, for
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  each t,phi bin, in 2 weeks
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Next Meeting
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------------
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We do not yet know whether our next meeting will be Aug 3 or 10, as it depends
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on whether DG is available on Aug 3.  GH/NH/JM/AP will be on a hiking trip in
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the Canadian Rockies
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- Thur Aug 3? @ 16:00 Eastern/14:00 Regina/13:00 Pacific
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- KaonLT will go first
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Also, please note that our last Zoom reservation for this time is Aug 17.  GH
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will circulate a poll to see if everyone is still available at this time for
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the fall semester
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