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Kaon LT Meetings » mtg_23mar09.txt

Garth Huber, 03/10/2023 03:08 PM

 
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                 Mar 9/23 PionLT/KaonLT Analysis Meeting Notes
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                 ---------------------------------------------
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                           (Notes by GH and SJDK)
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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 - Stephen Kay, Garth Huber, Muhammad Junaid, Ali Usman, Alicia Postuma,
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   Vijay Kumar, Nathan Heinrich
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JLab - Dave Gaskell
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CUA - Richard Trotta
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CSULA - Konrad Aniol
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Ohio - Julie Roche
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Nathan Updates
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--------------
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Aerogel calibrations
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- Petr Stepanov's calibration code used
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   - presentation from Petr on this, 2020-Sept-23
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   - Fits 20 Gaussians with some exponential tail dropping off as BG
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      - Each Gaussian is convoluted with an exponential fall off
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      - Realistically only up to ~5 PE is needed
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      - also note that we should have no pedestal as this is instrinsically
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        removed as part of FADC algorithm
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   - Ran calibration, plotted constants for each PMT vs run number
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      - Looks fairly flat across run numbers
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      - Scale is very large due to large error bars though
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   - Only PMT that looks odd is +3, poor Chi2
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   - Three fit methods in script, could try changing them and testing out?
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   - Will try reducing number of Gaussian's down to 10 or lower rather than 20
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      - GH: Maybe 6?
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- Compare to old algorithm (Peter B?)
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   - Old algorithm plot scales are very compressed compared to Petr's ones
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   - Petr's is better, but a lot of free parameters, which inflates errors
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   - the calibration parameters from the two algorithms seem not consistent
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     each other, NH needs to better understand exactly what is calculated
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   - Add some cuts to clean up protons?
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      - protons would add background events to left of 1pe peak (delta
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        knockout) which could throw off the calibration
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   - NH: Petr's script requires some cuts before hand to begin with, wants a
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     slightly cleaned up file, but not yet familiar with exactly what is done
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   - DG: Did kaons fire aero in PionLT?
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      - If just above threshold, might affect statistical sample
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      - GH: Kaons do fire the aerogel (or should) all the time
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        If want to reject kaons, then should place a cut on HGC in addition
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   - RT: Applying any geometry cuts on the tray?  i.e. for some indices the
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     aerogel does not fully fill the tray
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      - Old algorithm isn't, Petr's is
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      - Should apply in both
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- *Aerogel calib to do:*
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   - Need to check cuts in Petr's code
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      - Be sure protons are removed
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      - tray size cut
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   - Reduce #Gaussians in fit, hopefully get smaller error bars
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   - understand why params from two codes are so different
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   - read up on FADC operation, pedestal suppression (e.g. C Yero thesis)
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-Mystery LD- setting investigation (one with missing events after RefTime cut)
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   - Identical output with different reference time cuts, something's wrong
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   - can't figure out what's wrong with his scripts, asks if someone else can
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     try running from their account to see if get same answer
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   - *Junaid* will try to take a look at this setting next week
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   - DG: Do you apply timing cuts to trigger aparatus channels separately or just
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     to coincidence after it has formed?
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      - Yes, does have both
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      - Carlos had issues because they didn't have cuts on T1/T3, just the coin
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        time
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      - NH will *send email* to CY to confirm what he's doing is correct
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Junaid Updates
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--------------
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- No report, Busy with assignments
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Richard Updates
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---------------
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SIMC to hcana conversion scripts (EM, PM, etc)
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- Finishing up scripts
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   - Separate versions for production/HeeP, since different output variables
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Running more SIMC stats to reduce errors seen last week
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- GH: This is fine, but What we actually need from SIMC is a functional form
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  for L/T/LT/TT and how they vary with kinematics
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   - This is different to what is in SIMC now
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   - Garth sent physics_iterate.f routine as an example on how to do this
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   - Should be more straightforward for Vijay looking at the Pion
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- GH: I'm happy to have a separate meeting to discuss this more
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   - Need to pick *a* functional form separate for each before you do any
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     iterations
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   - *Then* run SIMC for large # of events
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- DG - Recent inclusive data had the sign of the raster correction wrong, not
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  sure how far back this goes
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   - this would adversely affect the reconstruction resolution
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   - PionLT almost certainly affected, possibly even also for KaonLT
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   - RT *will check*
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- Will be doing a new replay round soon
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   - SK: Make sure to save it to /cache! Want backed up runs at this point!
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Ali Updates
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-----------
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Looking at pion PID in KaonLT data
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   - Setting up scripts
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   - Hopefully plots/step by step guide next week
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   - AU/RT should *meet* next week to discuss PID, since their
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     foreground/background are linked
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Vijay Updates
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-------------
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LT separation code
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- Lots of errors when updated average kinematic script
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- Fixing/debugging this
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- RT: There's a lot to go through, use diff/grep to check between scripts
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Alicia Updates
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--------------
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- Very busy with two classes, no report
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Next Meeting
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------------
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New Meeting Time after USA savings time starts:
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- Thur Mar 16 @ 16:00 Eastern/14:00 Regina/13:00 Pacific
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- KaonLT will go first
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