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Kaon LT Meetings » mtg_22dec21.txt

Garth Huber, 12/21/2022 01:38 PM

 
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                 Dec 21/22 PionLT/KaonLT Analysis Meeting Notes
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                 ----------------------------------------------
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                           (Notes by GH and SJDK)
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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, Stephen Kay, Ali Usman, Nathan Heinrich
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CUA - Richard Trotta
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JLab - Dave Gaskell
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FIU - Pete Markowitz
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Ohio - Jacob Murphy
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Richard Updates
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---------------
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- SIMC changes to make PM, EM calculations the same as in hcana
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   - Added in hcana/Carlos Yero calculations to SIMC, declared 4-momenta as
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     DIM4 vectors to make things easier, had to implement a matrix inversion
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     routine by hand in order to avoid dependency to other packages
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   - New calculations seem to be an improvement, but PmZ has a large shift
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     compared to before
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      - Unit discrepancy?
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      - DG - SIMC is MeV by default
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   - Dave G will take a look at Richard's code, for example some extra
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     manipulation with unit vectors seems to be needed in results_write.f which
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     is not in Carlos' code
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- From now until Hall C workshop, will focus on LT separation code and try to
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  get something for the presentation
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Outline/plan for the KaonLT/PionLT Hall C talk
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----------------------------------------------
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- First round of output from Bill's LT-sep code
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- A few slides of intro, example plots
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- Q: should we show some of Alicia's results if there's time?
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   - They will be shown at the summer workshop, GH would put this as a lower
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     priority since there is already a huge amount to cover in ~16min talk
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- Nathan will make a general outline of the talk and distribute it in the
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  next few days
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- Richard has a deadline of Jan 6 to get stuff to Nathan
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   - Preliminary cross sections would be nice, but some indication that
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     separations are imminent is what we really want though, so example
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     plots from some steps in an LT separation iteration would be great
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   - Finalised offsets would be nice
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   - As a last resort, online analysis scripts still work OK and produce
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     some useful plots
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- Diamond cuts using Jacob's routine, applied to KaonLT data would be nice to
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  show in the Hall C talk
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- GH has an improved PionLT statistical error bar estimate for each
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  L/T-separation, based on online analysis, epsilon based on central
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  kinematics, and expected t-binning
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   - overall, the PionLT projected error bars are very similar to what was in
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     the proposal, with the exception of Q2=8.5 (significantly worse, partly
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     due to reduced delta-epsilon) and some pi- settings
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   - Nathan should let GH know what he would like for his presentation, in
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     terms of either tables or plots
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- Nathan's talk moved to Thurs afternoon, can advertise for Jacob's optics talk
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  on Friday
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Ali Updates
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-----------
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- New error calculations in template files
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   - Need to test all run types
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- Need to incorporate EDTM beam-off correction too
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   - will rerun Lumi data to check that it gives a good result
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- will finish testing by Friday and submit a big replay on ifarm for over
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  holidays
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Nathan Updates
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--------------
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- Debugged code needed to submit large # runs to look at the reference times
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   - Should have finished now, will take a look later today
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Jacob Updates
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-------------
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- Had a few meetings with Holly/Mark on HMS optics
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- Mark suggests checks to see if there was an issue with the raster when taking
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  the carbon sieve optics data
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   - Check W vs xRaster for hydrogen data (at small z, +/- 1cm from target)
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      - Should see no correlation
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      - Haven't had a look just yet
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   - Might explain lack of resolution in Xsieve
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      - And trends in this
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- Mark suggested a new method to try to select out sieve holes via cuts, to see
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  if this leads to any improvement in the Xsieve resolution
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   - Use Xfp vs Xsieve rather than xfp vs xpfp
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      - Potential downside: Using variable you're trying to correct (xsieve)
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      - Upside: the cut box is easier to draw, since its a clearer rectange
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      - No delta cuts
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      - will compare the result against SIMC as a check
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   - Try this one more time, removing areas (outside delta +/-8) we don't care
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     about for PionLT
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      - Mark is also puzzled that the Xsieve resolution varies so strongly
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Next Meeting
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------------
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Wed Jan 4 @ 9:00 Eastern/8:00 Regina/6:00 Pacific
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- PionLT will go first
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If you have not yet done so, please fill in the poll to pick our meeting times
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for Jan 9-Mar 24
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   https://www.when2meet.com/?18018413-nyesS
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From the responses submitted so far, the best times appear to be (all times
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Eastern):
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   Mondays 10:00-11:30
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   Wednesdays 9:00-10:30
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   Thursdays 17:00-18:30
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It's very important that you indicate which times you are really unavailable,
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not simply your personal preferences, as otherwise it will be impossible to
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find a time that works for most.
(147-147/430)