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Kaon LT Meetings » mtg_23sep12.txt

Garth Huber, 09/12/2023 05:16 PM

 
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                 Sept 12/23 PionLT/KaonLT Analysis Meeting Notes
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                 -----------------------------------------------
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                              (Notes by GH & AH)
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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, Nathan Heinrich, Muhammad Junaid, Alicia Postuma,
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   Vijay Kumar, Ali Usman, Nacer Hamdi
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FIU - Pete Markowitz
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CUA - Richard Trotta, Casey Morean
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York - Stephen Kay
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Ohio - Julie Roche
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JLab - Dave Gaskell
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Nathan Updates
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Hodoscope calibrations, picking up from where Jacob left off
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- comparison of before and after calibrations for SHMS data
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- Hodoscope calibration SHMS looks good, HMS calibrations are now running
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- Showed generally flat SHMS Beta vs Xfp, Yfp distributions, while before plots
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  had pronounced wiggles
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- SHMS: 10 runs were calibrated, will look at stability before deciding how
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  many calibrations are ultimately needed
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  - will do time walk first, hopefully only 3 sets needed, as MarkJ says that
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    these should be quite stable
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  - V_P (propagation speed??) may have to be done more often, as the output is
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    complicated and it's harder to tell if things are stable or not
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- small statistical deficit near middle x-position to be investigated
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Junaid Updates
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--------------
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Finished calorimeter calibrations for both SHMS, HMS
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- all database files updated, pushed to GitHub
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Will look again at DC calibs after Nathan pushes initial hodo changes
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- Waiting for the time of walk check/push from Nathan
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- might help Nathan with some of the stability checks in the interim
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Richard Updates
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---------------
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Update on the kaon LT analysis software
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- sample of binning scripts shown
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- SIMC data will have to be rebinned every iteration, but Exp data should only
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  need to be rebinned once (at beginning, after offsets are finalized)
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Will have a discussion with GH, VK, AU on LTsep software, and Offsets tomorrow
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at Noon Eastern, 10:00 Regina time 
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Alicia Updates
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--------------
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Beam spin asymmetry fit results
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- Beam asymmetry fits look consistent over most t-bins, except for couple of
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  bins at different Q2
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- Q2=2.11, lowest -t bin differs from zero by <2 sigma, which seems reasonable
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- short question on whether we should include an offset in the BSA fit, as one
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  bin's data suggests the fit would be better if BSA oscillation was slightly
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  shifted from zero
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  - this bin still has a reasonable chi-square near 1, however
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  - DG: if you include an offset, you have to do it for all bins, not just this
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    one
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  - GH: doesn't think adding an offset is justified given the quality of the
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    fit to the data without one
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    - would imply an unusual systematic error in the measurement of the BSA
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      that seems difficult to imagine
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- calculation of average kinematics per bin
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  - plot xB to get value from histo, instead of calculating from Q2-bar, W-bar
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Vijay Updates
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-------------
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SHMS Hodoscope efficiencies per plane
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- Runs: 8500-8600 display low efficiency compared to higher runs, also ~ 1-2%
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  efficiency jumps between different runs
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  - Plane 4 has the lowest rate, particularly for first set of runs near 8500
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- Dave: it could be related to protons contamination in the pion sample, this
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  decreases the efficiency, particularly for the quartz plane 4
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  - suggests to add Aerogel PID cut to select mostly pions (in the report file
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    calculation only, not the analysis)
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  - this might get rid of some efficiency fluctuations and raise the plane 4
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    eff
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  - concerned that the real hodoscope efficiency is a stable >99%, rather than
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    fluctuating down to 97%.  This would give rise to a 2% error in the LT-sep,
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    which would be magnified to an unacceptable level
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-  instead of plotting vs Coin Trig Rate, plot vs SHMS 3/4 trigger rate, which
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   corresponds more closely to the flux rate on the focal plane detectors
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- working on Carbon luminosity analysis, nothing to show yet
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Ali Updates
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-----------
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- Rerunning HeeP coin analysis for all Kaon LT data, for cross check against
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  Richard's results
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  - this is motivated by inconsistencies that GH reported in Heep data for
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    offsets
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- Picking up on Portia's DeltaPi BSA analysis
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  - comment from Trento meeting was to look more carefully at the pi+n
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    exclusive radiative tail
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  - Next: Estimate exclusive radiative tail and SIDIS of delta
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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 19 @ 15:00 Eastern/13:00 Regina/12:00 Pacific
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- KaoonLT will go first
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Join Zoom Meeting
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https://uregina-ca.zoom.us/j/94470211297?pwd=djBROEdWUENLUTF3ZFN1c0kvS0VIQT09
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Meeting ID: 944 7021 1297
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Passcode: 320362
(290-290/413)