Feb 1/24 PionLT/KaonLT Analysis Meeting Notes
                 ---------------------------------------------
                                (Notes by GH)

                     Today: KaonLT will be discussed first

Please remember to post your slides at:
https://redmine.jlab.org/projects/kltexp/wiki/Kaon_LT_Meetings

Present
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Regina - Nacer Hamdi, Ali Usman, Nathan Heinrich, Muhammad Junaid, 
   Vijay Kumar, Garth Huber
JLab - Dave Gaskell
CSULA - Konrad Aniol
CUA - Richard Trotta, Tanja Horn
York - Stephen Kay

Richard
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Implementing Dave's HMS delta correction
- modified event reconstruction script to implement Dave's correction factor
  delta_HMS(new) = delta_HMS(old) + C0*hsxpfp

Debugging Weight Iteration Script
- the script now works
- sigT model fit has some negative values due to improper fit parameters
  - fit parameters were taken directly from pi+ analysis with no modification
  - initial fit parameters give very small data/MC yield ratios, a lot of
    modification will be needed
- debugging only, still have to finalize PID and efficiencies

SIMC output with physics_iterate.f
- some potential confusion of use of GeV^2 or MeV^2 in SIMC
  - DG: not sure you have a units issue, maybe it's just that the
    parameterization is way off
  - GH: your SIMC should be in exactly the same units as physics_kaon.f, so you
    can compare them to find orders of magnitude issues
    - for example, you can compare MC yield/charge with SIMC event file
      generated with physics_kaon.f, and also with your iteration script
    - physics_kaon.f was used to generate projected yields for the KaonLT run
      plan, should be within 2x of the actual data yields.  Can use that
      comparison to see what might be wrong

Next steps
- RT hopes to get back to finalizing PID and efficiencies soon, after the
  remaining iteration script issues are dealt with

Ali
---
- no report, busy with thesis writing

Next steps
- will look at SIMC resolution tuning, to better match MM width between data
  and MC after Dave's HMS delta correction

- Dave gives some info on how to do this modification:
  - the relevant SIMC routines are in (s)hms/mc_(s)hms_hut.f
  - DC resolutions are specified in a DATA statement
  - should see how many % the data MM peak is wider than the MC peak and adjust
    DC resolution by a similar percentage, hopefully the change you need to
    make is not too drastic
- one issue might be to disentangle the separate resolution effects for
  (S)HMS
  - GH: hopefully they won't be too different, given that both spectrometers
    have the same DC layout
  - high/low epsilon data for a Q2,W setting have same SHMS but different HMS
    momenta, so maybe that can be used to disentangle the effects

Vijay
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- leaves for India EIC workshop at Bangalore tomorrow, circulated draft slides
  earlier this week
- completed 0-iteration checks of software
  - get convergence of fit params for 1st iteration, will show results after
    he's back

Nathan
------
- Julie and Charles have asked him for some information on how we determine
  offsets and how we did our Lumi studies
  - RT should expect to get some request for information from them
- hopes to have some time for analysis during RC quiet periods

Junaid
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- no report, working on JSA Fellowship application

Nacer
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Continuing DC calibs
- 50-60% of runs are replayed, lots of ifarm issues
- Stephen has also noticed a lot of job failure issues recently.  There was a
  big ifarm crash yesterday, please be sure you're subscribed to the scicomp
  email list to get notices of ifarm outages

Next Meeting
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- Thur Feb 8 @ 15:00 Eastern/14:00 Regina
  - PionLT will go first