Jan 11/24 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 - Garth Huber, Ali Usman, Alicia Postuma, Muhammad Junaid, Nathan
   Heinrich, Vijay KUmar, Nacer Hamdi
FIU - Pete Markowitz
CSULA - Konrad Aniol
JLab - Dave Gaskell
CUA - Richard Trotta, Tanja Horn, Casey Morean

Richard
-------
Failed jobs in Q2=2.1 W=2.95 replay
- presented list of runs that consistently failed replay
  - get a corrupted ROOT file
  - had to retry some runs several times
  - errors are put into a logfile on volatile for checking
- for one Dummy Run (7897) got a dtype error
  - likely a pyroot/C++ pointer issue

Update on XSect iteration script
- now doing a 2D fit function of both Q2, t-dep, instead of two 1D fits
  - fitting equations are now consistent with what is in SIMC
  - it's also *important* to check that the weight recalculation script (after
    the iteration) also uses the same equations

Ali
---
Working on other kinematics for piDelta BSA, including Left, Right settings
- doing shape study for t-bins where we have good statistics
- drafting text for Trento workshop whitepaper on Transition GPDs
  - will circulate something to rest of group soon

Vijay
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Working on LT-sep analysis
- having difficulty getting fits of model parameters to L/T/LT/TT to converge
- GH is happy to help look through code to see if he spots anything

Alicia
------
Similar to Richard, issues with replay scripts failing
- redid failed runs by hand, nearly done

Dave
----
Further investigation of MM resolution issue
- plot of hsxpfp vs. MX, Run 4916, P_HMS=5.292
- in 6GeV era, a saturation correction to delta was derived and implemented in
  ENGINE
  - this correction exists in hcana, but is turned off, since the needed
    correction depends on the used HMS matrix elements, which are different now
    than 6GeV era
  - need to refit the correction for new HMS matrix elements

- Dave does an ad-hoc correction, which seems pretty effective
  delta_corrected=delta-6.0*hsxpfp
  - reduces sigma_MX=7.34MeV to 6.27MeV

- other HMS momenta will need different corrections
  - Ali & Alicia will point DG to the correct ROOT trees for other HMS
    settings, and he will come up with corrections for other HMS momenta
- this effect came from the current offset in the Q3 power supply
  - this power supply was replaced in 2021 (recall the fire!), no longer an
    issue, correction needed for KaonLT data, but DG checked the data and
    PionLT data are okay

- DG: after removing the hxspfp correlation, which will improve the resolution
  of the data, we will then need to adjust the resolution in SIMC to match the
  data

Nacer
-----
DC calibration checks
- lots of useful help from Junaid
  - K+ event cuts give poor statistics, should re-try with pi+ cuts, which have
    ~10x more statistics

Junaid
------
Working on tracking efficiency scripts
- was using wrong LTsep package, scripts now working with Richard's help
- will have some results soon


The rest of the meeting was giving comments on Richard, Nathan, Alicia's slides
for next week's Hall C workshop


Next Meeting
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- no meeting next week due to Hall C workshop
- thanks for filling out the poll, we will continue to meet on Thursdays at
  same time

- Thur Jan 25 @ 15:00 Eastern/14:00 Regina
  - PionLT will go first