Oct 19/22 PionLT/KaonLT Analysis Meeting Notes
                 ----------------------------------------------
                           (Notes by GH and SJDK)

                    Today: PionLT will be discussed first

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

Present:
Regina - Garth Huber, Stephen Kay, Ali Usman, Love Preet, Alicia Postuma,
   Vijay Kumar, Nathan Heinrich, Muhammad Junaid
CSULA - Konrad Aniol, Emery Gunselman, Johnathan Conrad, Yeranuhui Ghandilyan
Ohio - Julie Roche
CUA - Richard Trotta, Tanja Horn
JLab - Dave Gaskell

Richard Updates
---------------
- Bill LT separation code updates
   - Stephen and Richard took a closer look at the code, ran into issues,
     determined it was a compilation issue
   - Contacted Bill, Bill resolved it very quickly for us over the weekend
      - Thanks Bill!
   - Requires a slightly updated cmake version, but this is a trivial change
   - Need to work on some updates to the code, change how cuts are applied etc
      - We already do this in our KaonLT code
      - all hardcoded file calls are fixed

- Tracking issues with Lumi
   - SHMS tracked yield still looks odd (-25%)
   - SHMS scaler analysis has +16% trend
   - DG: are you using pruning in the tracked analysis?
      - does not affect efficiency, just how to select best track
      - it could be there's a higher probability of selecting unphysical track
        at higher rate (more discussion later on pruning algorithm checks)

- For the HMS lumi studies - DG comment from Ali's committee meeting
   - Use ELREAL rather than ELCLEAN scalers
      - ELCLEAN is much cleaner, might not so affected at high rate
      - May help yields
   - Offset in BCM calibration
      - For low current, could just be a BCM calibration offset (100-200nA) that's
        causing the difference
      - then apply same offset to all data NEAR THAT TIME
      - definitely the 8.2GeV HMS scan shows evidence of the offset issue, as
        other points are flat ws current, and the first low current point is
        high
   - TH: Fpi-2 scaler lumi analysis also had some issues
      - for +polarity SHMS scan, probably will have to accept what we get once
        we get the - polarity scans to work out

- Talk for Hall C analysis meeting
   - Defining luminosities
   - Outlining cuts
   - Will clarify some slides and add a few updates
      - Will circulate tomorrow before the meeting
- Richard will be sending an email to Ali & Vijay requesting content for his DNP talk

Ali Updates
-----------
- To Do List:
   - test Peter Bosted's offsets and see how well they work
   - Investigate tracking a bit more, i.e. refresh tracking params
     - SHMS tracking efficiencies in particular still the big issue
     - believes we use pruning globally, will do some double checking
     - three different ways to select best track
   - DG: can apply cuts on many parameters, including xptar, PDF, delta, etc.
     - has concern that this can bias the track selection
     - should select a conservative set of pruning criteria that give a fixed
       rate dependence and use that, but optimal values might change with setting
     - Peter Bosted tends to be very aggressive with pruning cuts, and not sure
       if this is the right strategy
   - GH: suggest to look at lumi runs 5154-5299 (7 runs) and see what the rate
     dependence looks like under different pruning scenarios
    
Vijay Updates
-------------
- Busy making slides for committee meeting
   - Meeting is on Friday morning (10:00 CST)
- To Do List:
   - 2.7 GeV pionLT data - need to do the Lumi analysis
      - Carbon first
      - Then LH2
   - Pion/Kaon PID studies: cut finalization, cut dependency
   - LT Separation
      - On the cards for next year
- Some issues with Lumi scripts, need to diagnose
   - Contact Stephen if encountering errors

Jacob Updates
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- Not at meeting, but will co-ordinate with Richard re:Analysis Meeting tomorrow

Nathan Updates
--------------
- PhD comprehensive done
- PhD Committee meeting coming soon too, report in progress
- Need to check with Jacob on his progress for calibrations
- To Do List:
   - NGC code updates
      - Someone mentioned previously (last week?) that there's a new NGC
        calibration code
      - Cameron Cotton updated it, can't identify single PE peak in NGC so
        approach is different
      - fits a Gaussian to the NPE distribution and infer calibration from the
        width
      - GH: a Poisson fit would work better, as the distribution is asymmetric
        at low NPE

Junaid Updates
--------------
- PhD comprehensive written part is done
   - Oral exam this afternoon, good luck!
- PhD Committee meeting coming soon too, report in progress
- To Do List:
   - Calorimeter and DC calibrations

Alicia Updates
--------------
- Made a start on the helicity analysis
   - very preliminary plots without optimized cuts
   - Already looks relatively promising, see spin asymmetries
- To Do List:
   - KaonLT data PID
   - Background subtraction
   - MM peak fitting/integration

Next Week
---------
- PionLT will be first
- GH will join from Vancouver before his flight to New Orleans
- Stephen will be in-flight to DNP meeting

Reminder about meeting time for Nov 9-Dec 21
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- Wednesdays at 7:15 Regina/8:15 Eastern
- really apologize to those joining from California, but no other time worked
  for everyone
- will have a different poll for Jan-March, when people's teaching schedules
  are different.  Hopefully we can find a later time in the day