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Kaon LT Meetings » mtg_22may31.txt

Garth Huber, 06/01/2022 06:39 PM

 
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                May 31/22 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 - Stephen Kay, Garth Huber, Nathan Heinrich, Ali Usman, Muhammad Junaid,
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   Love Preet, Vijay Kumar (arrived late due to doctor appointment)
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Ohio - Jacob Murphy, Julie Roche
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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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Richard Trotta
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--------------
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- AU has been very helpful fixing some scripts
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   - Charge corrections/normalisations for data were off
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   - GH - Lumi scan Q, are charge normalizations not done here?
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   - RT - Had things a bit mixed up when doing SIMC comparison, charge
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          corrections were done in Lumi Scan?
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   - SIMC data looks better, recompiled SIMC
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      - SIMC kept producing somewhat odd results, not sure why this should have
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        been needed
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   - SIMC Blue, red is data (not charge corrected)
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      - HeeP Coin data
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   - *Shouldn't be hard coding charge normalisations/corrections*
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- Efficiencies work
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   - Script to compile all relevant info to one csv file
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   - AU needs aerogel positions still for cuts in report file
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      - Script to get positions written, just checking a broad range
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- 2 week plan
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  - Better HeeP data/MC comparison with fixed charge normalisations and SIMC
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    fixes
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  - Aerogel positions
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  - Report file part of efficiency script should be done
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  - Hodoscope calibrations (hopefully!) for 2018, 10.6 GeV data
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Ali Usman
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---------
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- HeePCoin 8.2 GeV data
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   - Red data, blue SIMC, charge normalised, dummy subtracted and SIMC weights
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   - Despite changes, still some shifts apparent
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   - No SIMC or data re-normalization needed *GOOD*
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   - No offsets, no efficiencies applied yet
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   - DG - Could just grep some values and use them for now?
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      - Could just do a quick and dirty correction and see how it looks
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   - DG - What is spectrometer central momentum?
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      - ~4.3-4.6 GeV for both
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   - x/y seem to be flipped between SIMC/Data
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      - Just plot the wrong way around for now?
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      - GH: *AU and VK need to check the equations in hcana and SIMC* to
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        confirm the differences.  For SIMC, look at event.f
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   - also sees that Pmiss and Emiss distributions for MC are narrower than Data
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      - *Reconstructed variables (Pmiss, Emiss) in SIMC not calculated in the
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        same way as hcana*
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      - this affects not only the variable mis-matches, but also the shapes of
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        the distributions themselves, as the resolutions can work out better or
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        worse depending on how the calculation is done
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      - DG fairly certain on this.  He tried looking at hcana code but no
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        one-to-one correspondence between the hcana and SIMC equations was
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        obvious
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      - SK - I agree that this appears to be the case
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      - Should be addressed long term
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         - Standardise calculation in hcana/SIMC
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            - This needs to be on the agenda long term
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      - Peter B looked at HeeP and recalculated values himself, since he didn't
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        trust that hcana and SIMC calculated them the same way
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- 2 week plan
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   - Finish report files for Richard
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   - Debug some of the HeeP issues
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   - Implement some efficiencies
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   - Hodoscope calibrations too (different energies)
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Vijay Kumar (Slides presented by GH)
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-----------
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- Data/SIMC comparisons, HeePCoin
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   - Old -> Improved
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      - Used Jochen's Heepcheck program, 0.13% HMS momentum offset applied
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   - Mean quoted on plots, histogram mean?
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   - Found bug last week relating to how weight was applied
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      - Was applying aeverage weight to all events, NOT weighting each
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        individual event
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      - Scripts now use weight correctly, distributions now have similar shape
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   - Flipped pmz
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      - AU Q - Is pmz flipped in the plot or when calculating it?
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      - GH - Assume probably just when filling histogram
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- 2 week plan
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   - Need to do 4.8 GeV and other Heep COIN
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   - include Effs
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   - should help track pmx,y,z differences between hcana and SIMC
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Pete Markowitz
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--------------
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- Hall C UG wants two talks
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   - One on PionLT/KaonLT talk
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   - One on the Pion form factor
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   - 20+5 talks, Thursday afternoon June 16th
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   - Vijay -> KaonLT
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   - Junaid -> PionLT
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   - Circulate 1st draft of slides by 10th of June
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   - Dry run: 14th of June at 15:30 Eastern
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Jacob Murphy
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------------
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- Hodoscope calibrations are at a pretty good point going in to the upcoming
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  experiment
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   - will start upcoming run with best params from fall/winter run
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   - will need to redo calib w/defocused data soon after data taking starts
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- EDTM DeadTime calcs
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   - wrote up a report which has been circulated around a little bit
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      - will make improvements and distribute to whole PionLT/KaonLT group
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   - How event type 3 is handled is a bit odd
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   - Need to try and make sense of the event types and how they are actually
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     determined
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   - the issue seems to be when prescale factors are checked by the DAQ
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      - event type 3 is BOTH singles
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      - the issue is when an event is accepted in both singles triggers at the
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        same time, but only one is saved
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      - this will happen for every EDTM event, unlikely to happen for physics
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        events
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   - *event type preference order: 6,5,3,1,2,4*
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      - COIN physics events are fine, EDTM goes through COIN trigger
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      - but COINs are turned off during Heep singles and Lumi
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        in this case one arm will take precedence
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      - *need to set EDTM rate for lowest rate arm*
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   - DG - Should we try running singles completely on their own? Try and
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     disentangle this
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   - JR - Would be nice to try to disentangle this further
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   - One trigger at a time would double the time it takes to do HeeP singles
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     though.
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   - Can we switch the singles DAQs?
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      - Would need to switch, then switch back to COIN DAQ
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      - Reset all timing windows etc each time too, so it's not very practical
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   - GH - Are we not ok if we only prescale one arm?
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   - JM - Didn't consider EDTM when considering this
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      - *Any time you have a PS=0 in SHMS, you will *never* see EDTMs in HMS*  
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      - Presentation on all of this info back in February
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        https://redmine.jlab.org/attachments/download/1401/PionLT_EDTM_Study2_Analysis.pdf
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   - Problem has always been there, but never understood
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   - 6 GeV data handled very differently
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   - CPULT can still be calculated without too much issue
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   - Physics/Coin runs, EDTM value is fine
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      - Single arm EDTM LT is the issue
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- PionLT summer run plan optimisations discussions
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   - *Take another look at 10 GeV run plan, HeepSing and Lumi*, do any of these
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      present an issue?
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   - Skip some lumi scans and do some as single arm?
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   - P > 5 GeV/c in HMS on one lumi scan?
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      - Want carbon optics and delta scan for anything with HMS P > 5 GeV/c
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      - DG - No LUMI just a white spectrum, shouldn't care
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      - but *delta scan needed for every physics setting with HMS P > 5 GeV/c*
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   - discussion on sieve runs
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     - can do rastered, 1x1 is preferred over 2x2
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     - note Run 4819 (KaonLT) used 2x2 and sieve plots look fine
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   - Need to focus on decisions wrt 10 GeV asap
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   - GH, JM, NH, MJ will discuss again at tomorrow's Run Plan meeting
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- 2 week plan
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  - finish 10 GeV run plan
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  - some EDTM studies w/ event types
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    - revisit report on EDTM, make implications clearer
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Junaid
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------
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- Finished lumi scans part of summer run plan
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   - Arrived at several settings
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   - sent comments on NH, JM plans.  2nd draft posted on RedMine
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- Shift Worker instructions circulated for review 
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   - Not on Redmine yet
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   - JM will post on Redmine
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- DC/Cal calibrations
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   - path issues fixed, deciding on runs to do
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- 2 week plan
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   - Detector calibrations
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   - Hall A/C Presentation
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Nathan
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------
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- Run plan draft on the Redmine
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   - Spreadsheet on there too
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- Trying to get the HCG/NGC calibration working
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   - Issues running it for Nathan
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   - Vijay checked and it ran OK for him
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      - Need to be 100% sure the conditions are identical
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   - Trying to pull script out of TProof framework
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      - Script seems to have open brackets and errors included, is version the
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        same as Vijay's?
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   - Non TProof version probably best
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      - Could just use TChain or just hadd would work ok
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Shifts
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------
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- GH will circulate another reminder for people to sign up
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Comment from Tanja
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------------------
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- Redmine 
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   - Would be nice to add an analysis task/timeline to the PionLT redmine
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Next Meeting
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------------
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15:30 EDT on the 14th of June
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- main agenda item will be Vijay and Junaid dry runs
(55-55/412)