Meeting to discuss Kaon-LT Efficiencies for Normalized Yield
                               22-Jun-13

                              (Notes by GH)

Attendees: Stephen Kay, Garth Huber, Ali Usman, Richard Trotta, Vijay Kumar

Richard and Ali
---------------
- show efficiency plots from new report files
  - EDTM-LT and COMP-LT look consistent with each other, which is good
  - no LT>100%, but that's because the plots are only for COIN data runs
  - EDTM-LT: 95-100% up to ~2kHz COIN-TRIG-Rate.  Then there is a knee at 2kHz,
    and the LT drops rapidly, reaching 80% @ 4kHz
  - GH is a little surprised the knee starts as early as 2kHz, but the LT
    remains above 95% until 3kHz, which is consistent with Carlos' earlier
    study

- tracking-eff, hodo-eff, cher-eff also look pretty reasonable
  - there are some inconsistencies with rate that need to be more closely looked
    at, such as some significantly lower HMS cher-eff.  GH thinks these are likely 
    due to pi- contamination in the electron sample, and the applied cuts should
    be checked more carefully

- the full replay did not include any Lumi or Heep-Singles runs

- also, no aerogel position cuts were applied because they are not set yet
  - we discussed the plot Vijay made earlier of Aero NPE vs x,y to illuminate
    where the position cuts should go.  It is better to place the cuts based on
    the data analysis, rather than numbers from Vladimir, as the aerogel can
    shift in the tray during craning.

- also the Summer 2019 data have not yet been replayed with the new report
  files.  This will wait 1-2 weeks until the aerogel cuts are selected, and
  other checks made.
   - Vijay will have to do similar studies vs run number as Richard & Ali for
     these data

- K+ efficiencies in aerogel
   - K+ need to be selected with a (HGC < npe) cut
   - pions will leak through the (HGC < npe) cut, so a hole cut needs to be
     applied to avoid this region.  Will not cause a problem for the aerogel,
     as its performance is uniform (due to lack of mirrors), but pion leak
     through needs to be minimized, so the cut can be more generous than usual.
   - this means the K+ aerogel efficiency can't be easily calculated in the
     report file, and should be done in the same script used to do the HGC effs

- unlike the aerogel, no K+ efficiencies in HGC need to be applied, due to the
  (HGC < npe) cut

- K+ tracking efficiency
   - GH thinks it will be very difficult to do a K+ tracking efficiency, as the
     statistics will be poor, and you need to worry about pion contamination
   - suggests instead to calculate pion and proton tracking efficiencies and
     see if they are different.  Then apply either the pion tracking eff to the
     K+ data, or the mean of the pion and proton effs

Update on various SIMC issues
-----------------------------
- Ali followed up on beam energy spread in SIMC
  - Gaskell thinks that it's a non-issue.  0.05% is OK, maybe even too big

- Richard Heep Data/SIMC comparison
  - half of his data had a 40ns CT offset compared to the rest of the same
    setting
  - needed to adjust the offset and replay again
  - data/MC comparisons look much better now

- Ali still tracing differences in Pmiss Emiss calculation between hcana and
  SIMC
  - he feels more inclined to make SIMC calculation the same as hcana than the
    other way around.  Found some issues with over-written variables in SIMC
    (seems a bit strange to GH)

Next meeting
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- Tue Jun 28 @ 11:30 Eastern, immediately after RC meeting