Jan 12/22 PionLT/KaonLT Analysis Meeting Notes

Participants:
 - Richard Trotta, CUA
 - Pete Markowitz, FIU
 - Dave Gaskell, JLab
 - Jacob Murphy, Ohio
 - Nathan Heinrich, Garth Huber, Muhammad Junaid, Stephen Kay, Vijay Kumar,
   Love Preet, Ali Usman, Regina

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

Junaid
------
1) PID study from Sept PionLT data
- SHMS cuts to produce samples of pi+, K+ and proton physics events
- Suggestions:
  - need to show and optimize the SHMS calorimeter cuts, as the NGC distn is up
    to 30pe.  This is a bit surprising, so maybe there is some e+
    contamination.
  - RF cut for pi+:
    - get a nice peak between 1.3 and 2.7 when applying other PID and cointime
      cuts
    - can use the RF cut to optimize other PID cuts, but probably should not
      use it for the final pi+ analysis as it looks like you loose too many pi+
  - RF cut for K+:
    - get a clear peak at RF=1.0ns, but this appears to NOT be K+.  Judging from
      the MM-RF correlation, the real K+ are offset slightly from pi+, pions
      centered at 1.8, K+ centered at 1.5
  - RF cut for protons:
    - the peak at 1.0ns appears to be the protons.  The RF cut appears to be
      quite effective in separating them from K+/pi+
  - unexplained RF features:
    - there is a "wrap around" RF peak at 3.7.  This should be studied to be
      sure we understand what it is.
    - Not sure what the additional peak at 3.0 is.  Please re-check if the RF
       offset is the same for all runs or not.

Richard
-------
1) EDTM study
- finished a second set of runs over the weekend.  Still need to analyze them.

2) Analysis Task List
- met with Vijay on how to split up the Heep and Lumi analysis tasks.

Vijay
-----
1) Heep-singles analysis from low Q2 Kaon-LT data
- implemented most of the changes discussed last week.
- comparison between data and SIMC is looking much better, except for some
  runs.
  - the two bumps in SHMS ypfp were indeed due to the HGC inefficient region
- Examples of both good and bad comparisons were shown.
  - Bad HMS comparison (#2 of 3.9 GeV).
    Dummy contribution is too large.
    Q2, epsilon distns offset from Dummy run.
    Definitely a kinematics-mismatch issue.
  - Bad SHMS comparison (#5 of 3.9 and #2 of 4.9 GeV).
    Data is too low compared to SIMC.
    This might be a tracking issue.  Please check the pruning selection
    parameters and the resulting tracking efficiencies.

Jacob
-----
1) EDTM Analysis
- started working on analysis of Lumi scan #3 and EDTM analysis.  Nothing to
  show yet.

Nathan
------
1) Mode 10 Analysis
- got hcana to compile.  Showed some early results from a defocused SHMS
  electron run.
- looking at hgcer Mode 10 data
  - reconstructed Pulse Time distn looks the same as FADC data
  - reconstructed Pulse Integral distn also looks the same
  - however, the Pulse Amplitude distn has some significant differences.  This
    needs to be understood.
  - while at JLab, Nathan will see if he can arrange a morning meeting with
    Mark to discuss his findings.

Next Meeting: Wed Jan 26 @ 11:00 Regina/NOON JLab time