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Kaon LT Meetings » mtg_24feb01.txt

Garth Huber, 02/01/2024 05:10 PM

 
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                 Feb 1/24 PionLT/KaonLT Analysis Meeting Notes
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                 ---------------------------------------------
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                                (Notes by GH)
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                     Today: KaonLT 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 - Nacer Hamdi, Ali Usman, Nathan Heinrich, Muhammad Junaid, 
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   Vijay Kumar, Garth Huber
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JLab - Dave Gaskell
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CSULA - Konrad Aniol
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CUA - Richard Trotta, Tanja Horn
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York - Stephen Kay
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Richard
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-------
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Implementing Dave's HMS delta correction
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- modified event reconstruction script to implement Dave's correction factor
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  delta_HMS(new) = delta_HMS(old) + C0*hsxpfp
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Debugging Weight Iteration Script
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- the script now works
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- sigT model fit has some negative values due to improper fit parameters
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  - fit parameters were taken directly from pi+ analysis with no modification
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  - initial fit parameters give very small data/MC yield ratios, a lot of
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    modification will be needed
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- debugging only, still have to finalize PID and efficiencies
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SIMC output with physics_iterate.f
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- some potential confusion of use of GeV^2 or MeV^2 in SIMC
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  - DG: not sure you have a units issue, maybe it's just that the
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    parameterization is way off
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  - GH: your SIMC should be in exactly the same units as physics_kaon.f, so you
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    can compare them to find orders of magnitude issues
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    - for example, you can compare MC yield/charge with SIMC event file
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      generated with physics_kaon.f, and also with your iteration script
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    - physics_kaon.f was used to generate projected yields for the KaonLT run
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      plan, should be within 2x of the actual data yields.  Can use that
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      comparison to see what might be wrong
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Next steps
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- RT hopes to get back to finalizing PID and efficiencies soon, after the
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  remaining iteration script issues are dealt with
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Ali
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---
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- no report, busy with thesis writing
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Next steps
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- will look at SIMC resolution tuning, to better match MM width between data
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  and MC after Dave's HMS delta correction
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- Dave gives some info on how to do this modification:
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  - the relevant SIMC routines are in (s)hms/mc_(s)hms_hut.f
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  - DC resolutions are specified in a DATA statement
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  - should see how many % the data MM peak is wider than the MC peak and adjust
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    DC resolution by a similar percentage, hopefully the change you need to
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    make is not too drastic
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- one issue might be to disentangle the separate resolution effects for
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  (S)HMS
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  - GH: hopefully they won't be too different, given that both spectrometers
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    have the same DC layout
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  - high/low epsilon data for a Q2,W setting have same SHMS but different HMS
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    momenta, so maybe that can be used to disentangle the effects
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Vijay
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-----
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- leaves for India EIC workshop at Bangalore tomorrow, circulated draft slides
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  earlier this week
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- completed 0-iteration checks of software
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  - get convergence of fit params for 1st iteration, will show results after
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    he's back
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Nathan
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------
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- Julie and Charles have asked him for some information on how we determine
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  offsets and how we did our Lumi studies
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  - RT should expect to get some request for information from them
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- hopes to have some time for analysis during RC quiet periods
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Junaid
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------
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- no report, working on JSA Fellowship application
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Nacer
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-----
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Continuing DC calibs
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- 50-60% of runs are replayed, lots of ifarm issues
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- Stephen has also noticed a lot of job failure issues recently.  There was a
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  big ifarm crash yesterday, please be sure you're subscribed to the scicomp
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  email list to get notices of ifarm outages
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Next Meeting
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------------
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- Thur Feb 8 @ 15:00 Eastern/14:00 Regina
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  - PionLT will go first
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(365-365/413)