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Kaon LT Meetings » mtg_22jun28.txt

Garth Huber, 07/01/2022 11:41 PM

 
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                Jun 28/22 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 - Vijay Kumar, Garth Huber, Stephen Kay, Nathan Heinrich,
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   Ali Usman, Love Preet, Muhammad Junaid
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Ohio - Jacob Murphy
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CUA  - Vladimir Berdnikov, Richard Trotta
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FIU  - Pete Markowitz
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Richard Trotta Updates
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----------------------
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- Updated KaonLT redmine task list
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   - All dates are updated, Gantt chart actually works
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   - Can add plots/slides to each task
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   - Issues are linked on the task list
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   - Update/add READMEs and code as needed
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   - *People need to add links to their work*
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      - Add cryo boiling results from Hall A/C meeting (B Henry) as a resource?
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         - How do ours differ/compare?
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   - RT reports that the analysis schedule seems to be mostly holding ok these
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     last few months
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- HGC efficiencies script added to Richard's efficiency script
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   - received code from Vijay and implemented in script
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   - Need to get different cut values/shapes for different mirror
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     configurations/run periods
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     i.e. before and after HGC mirror realignment
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     - presently using hole cut for after alignment only
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   - *Ali will have to optimize the HGC efficiency cut* (for pi+) according to
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     SHMS momentum
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- Hodoscope calibrations
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   - Run 6762 (6.2 GeV) SHMS looks bad.  Weird wiggles in beta vs xfp, dp
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   - *Vijay needs to look at this* for his data too
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- LT/Separation software
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  - RT has forked Bill's code on GitHub and has started making edits
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  - Links to files on Loon are broken in notes Bill had on the LT separation
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    scripts
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    - GH subsequently found the files in an old backup of Bill's directory
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      and posted a copy for RT, AU, VK
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- Discussion on Lambda/Sigma fitting (lineshape from SIMC to MM data)
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   - the MM data distribution needs to be fitted with:
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      a) Lambda peak shape from SIMC
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      b) Sigma peak shape from SIMC
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      c) Estimate of pion leakthrough (from pion sample, similar to how Vijay
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         has demonstrated) 
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   - Sigma can't be done independently of the Lambda, since some of the Lambda
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     tail overlaps with the Sigma
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   - In best case scenario, the details of the Sigma fit are not overly
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     sensitive to the Lambda fitting, and the two can be decoupled once they're
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     close to the final values
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   - In worst case scenario, both the Lambda and Sigma fits need to be revised
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     each iteration, in a manner similar to how Bill had to handle the huge
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     background underneath the Omega peak
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Ali Usman Updates
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-----------------
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- Updates to scripts/files and templates 
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   - HMS/SHMS singles cut files
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      - For HeeP singles and Lumi
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   - Aerogel 1.011 has a smaller tray size, all of the others are the same
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     (Richard looked up the aerogel tray sizes)
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      - Only two cut ranges needed
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      - Cuts seem very broad?
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      - 1.011 is actually very small compared
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         -30 to 30 and -40 to 40 roughly
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      - has two versions of the cut files, one for each aerogel cut
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   - Heep singles/SIMC comparo should be good to go
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- EDTM livetime calculations, now included in PionLT online data
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   - Discussion of what PS scale factor is implemented in Ali's code
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      - PS factors in report file are off?
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      - PS values entered in the GUI, not the actual factors - Is this true?
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      - Need to replace factors with other variables
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         - Double check this
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- Missing variable calculations in SIMC
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   - *need to apply same aerogel tray cuts* to data, effs, MC
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   - same will be true for HGC hole cut
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   - what cuts are applied depends on whether selecting pi+ or K+ in analysis
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- Drafting write-up for hodoscope efficiency calculation
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   - This is done in hcana
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   - will circulate a draft next week
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- SIMC input file energy spread
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  - will make changes to data MM calculation to make the equations the same as
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    those used in SIMC, since SIMC result seems better resolution
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Vijay Kumar Updates
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-------------------
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- Working on offsets for 4.9 GeV data
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  - added xtar,ytar,xptar,yptar MC/Data comparo plots
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  - can adjust ytar center of target in SIMC input file to get better agreement
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  - yptar overall looks good, but data have tails that SIMC doesn't show
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- With 0.13% offset applied, MMK shifted too far to the left (was on the right)
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   - Momentum offset worked for one Heep setting, but not the Physics
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   - at least the good news is that the real offset is smaller than 0.13%, not
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     larger
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- *Separate momentum offsets should be found* for different energies
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   - Need to look at the summer data too
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   - the idea is to first find out what offsets are needed to optimize each
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     Heep setting, and then we can look if there is a trend, or if they are
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     consistent, before deciding what to do globally
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   - Multiple offsets to play around with, not just momentum
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   - after Heep-coin offsets are found, we can then look at Heep-singles to
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   - confirm the offset is applied to the correct spectrometer
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   - tiny adjustments can be made to physics replay to optimize MC comparo
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Jacob Murphy Updates
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--------------------
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- Finished up EDTM study report
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   - Updates and clarifications to EDTM calculation correction values
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   - rewrote the LT formula to put the prescale factors in 1/PSF format, so the
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     formulas work out more nicely
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   - *Event Type 3* can only occur if there are both HMS+SHMS singles and COIN
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     is pre-scaled but not fired for that event, or an EDTM event
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      - maybe the early PionLT data with prescaled COIN can provide a useful
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        check of our understanding?
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   - EDTM pulses can have ALL trigger types, can only separate them out via
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     event handler
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- Very nice graphical guide presentation on events types, explaining how DT
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  works for various event types based on timing and priority (i.e. who blocks
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  whom)
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Nathan Heinrich Updates
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-----------------------
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- HGC calibration script nearly done, running a test
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Muhammad Junaid Updates
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-----------------------
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- Calorimeter and DC calibrations
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   - Plots from last run period next meeting
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      - Will post sooner
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   - *MJ should help JM with new data calibs*
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Next Meeting
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------------
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Tuesday July 12 @ 11:30 Eastern, after RC meeting
(61-61/430)