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Kaon LT Meetings » mtg_22aug04.txt

Garth Huber, 08/06/2022 07:16 PM

 
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                Aug 4/22 PionLT/KaonLT Analysis Meeting Notes
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                ---------------------------------------------
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                           (Notes by GH and SJDK)
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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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Regina - Garth Huber, Stephen Kay, Nathan Heinrich, Alicia Postuma,
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   Muhammad Junaid, Love Preet, Vijay Kumar
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Ohio - Jacob Murphy
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CUA - Richard Trotta
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FIU - Pete Markowitz
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Richard Trotta Updates
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----------------------
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- Roughly on track time wise with analysis tasks
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- HeeP Cuts
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   - Aerogel position cuts now included
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   - Included offsets Vijay sent for Hall C replay
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   - Need to 0 offsets in the file before studies, as offsets inherited from
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     some older analyses are included in the files
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   - 10.6GeV Offsets seem broadly similar to Vijay's
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      - dThetaHMS ~1.5 mrad, dp_HMS -0.1%
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      - dThetaSHMS 0 mrad, dp_SHMS 0.0%
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      - showed a W plot.  Vijay: need to look in particular at the PM
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        components.  Richard: will show these at next meeting
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   - Data/MC for HeeP singles is huge (~15x) in some cases
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      - HMS xfp
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      - SHMS xfp
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      - Seems like a normalisation issue somewhere
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      - Prescale factor issue on data, almost certainly the cause
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      - will discuss this offline w/Ali, Vijay
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- Lumi scans
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   - current cut issue for low current runs, need to adjust current cuts for
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     these
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   - Statistical error bars only
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   - If ignoring the low current run with bad cut, HMS scans are flat at ~2%
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     level, but lots of non-statistical issues (large fluctuations) clearly
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     evident
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   - SHMS is not good, sees large rate trend, with huge (>25%) carbon
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     boiling
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   - PID/Current cuts and trigger windows can all affect slope quite
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     dramatically, nearly resolved
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      - PID cuts need updating
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      - Nathan: Peter Bosted says to use lower bound cuts, not boxes,
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        as the upper bound cut introduces a rate dependence, due to
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        extra hits encountered at high rate
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- Hodoscope calibrations
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   - All look good except for 6.2 GeV
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      - Autumn/Winter 18 and Spring 19
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         - Summer 2019 needs checking by *Vijay*
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   - May want to check threshold Dave Mack adjusted (see his log post)
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- Continuing to look at Bill's L/T-separation code
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   - Lots of hard-coded information to adjust
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Ali update via Richard (Ali is at eye doctor)
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---------------------------------------------
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- Still looking at missing energy and momentum equations
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   - Comparing SIMC and hcana
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   - HGC efficiency calculation for pi+
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- Aerogel efficiencies?
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   - Ali has tray dimensions
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   - Different calculations for each
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   - Vijay/Ali/Richard meeting 11am (EDT) Saturday to discuss further
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Vijay Kumar Update
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------------------
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- Low Q2 Heep studies update
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   - Matrix of offsets applied
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   - Show effect of shifts before and after at 2.7, 3.6, 3.8, 4.5, 4.9 GeV
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   - Offsets seem to be roughly consistent with what Jochen and Tanja had in
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     their theses
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   - Please make *plots* of offset vs theta/spectrometer momentum
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      - Tables compared to beam energies
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   - Should also *compare Heep singles with these offsets* for consistency
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Jacob Murphy Update
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-------------------
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- Diamond cuts script to automate the low epsilon diamond cut equations
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   - In a good working state
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   - Fits a line to each side of the "diamond"
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   - fitting method looks at first and last filled bin in x,y
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       - eliminate outliers with min #counts cut
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   - then do a fit over part of the side of a diamond
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       - fit range is adjustable, shown nicely on the plot
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   - Low epsilon diamond plots should have MM cut included, as well as prompt
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     peak CT cut
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   - To ease selection of runs, Q2/W added to run list would be nice
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   - Look up table?
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Muhammad Junaid Update
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----------------------
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- Working on the 8.5GeV run plan
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- DC/calorimeter calibrations for both spectrometers
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   - First and last run of each setting
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      - More if the setting was very long
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   - Once done, will create a summary and circulate
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   - SHMS calorimeter calibrations will have to be treated differently
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      - Not much -ve polarity running where you can calibrate the peak at 1
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      - For positive polarity, want pi+ to be at a typical value ~0.3(?) 
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Nathan Heinrich
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---------------
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- 6.4GeV Run plan updates
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- Poster work for Gordon Conference
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Next meeting - Aug 17 @ 11:30 Eastern/09:30 Regina time
(67-67/430)