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Kaon LT Meetings » efficiencies_22jun13.txt

Garth Huber, 06/13/2022 09:10 PM

 
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      Meeting to discuss Kaon-LT Efficiencies for Normalized Yield
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                               22-Jun-13
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                              (Notes by GH)
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Attendees: Stephen Kay, Garth Huber, Ali Usman, Richard Trotta, Vijay Kumar
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Richard and Ali
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---------------
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- show efficiency plots from new report files
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  - EDTM-LT and COMP-LT look consistent with each other, which is good
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  - no LT>100%, but that's because the plots are only for COIN data runs
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  - EDTM-LT: 95-100% up to ~2kHz COIN-TRIG-Rate.  Then there is a knee at 2kHz,
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    and the LT drops rapidly, reaching 80% @ 4kHz
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  - GH is a little surprised the knee starts as early as 2kHz, but the LT
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    remains above 95% until 3kHz, which is consistent with Carlos' earlier
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    study
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- tracking-eff, hodo-eff, cher-eff also look pretty reasonable
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  - there are some inconsistencies with rate that need to be more closely looked
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    at, such as some significantly lower HMS cher-eff.  GH thinks these are likely 
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    due to pi- contamination in the electron sample, and the applied cuts should
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    be checked more carefully
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- the full replay did not include any Lumi or Heep-Singles runs
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- also, no aerogel position cuts were applied because they are not set yet
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  - we discussed the plot Vijay made earlier of Aero NPE vs x,y to illuminate
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    where the position cuts should go.  It is better to place the cuts based on
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    the data analysis, rather than numbers from Vladimir, as the aerogel can
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    shift in the tray during craning.
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- also the Summer 2019 data have not yet been replayed with the new report
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  files.  This will wait 1-2 weeks until the aerogel cuts are selected, and
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  other checks made.
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   - Vijay will have to do similar studies vs run number as Richard & Ali for
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     these data
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- K+ efficiencies in aerogel
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   - K+ need to be selected with a (HGC < npe) cut
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   - pions will leak through the (HGC < npe) cut, so a hole cut needs to be
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     applied to avoid this region.  Will not cause a problem for the aerogel,
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     as its performance is uniform (due to lack of mirrors), but pion leak
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     through needs to be minimized, so the cut can be more generous than usual.
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   - this means the K+ aerogel efficiency can't be easily calculated in the
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     report file, and should be done in the same script used to do the HGC effs
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- unlike the aerogel, no K+ efficiencies in HGC need to be applied, due to the
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  (HGC < npe) cut
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- K+ tracking efficiency
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   - GH thinks it will be very difficult to do a K+ tracking efficiency, as the
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     statistics will be poor, and you need to worry about pion contamination
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   - suggests instead to calculate pion and proton tracking efficiencies and
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     see if they are different.  Then apply either the pion tracking eff to the
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     K+ data, or the mean of the pion and proton effs
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Update on various SIMC issues
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-----------------------------
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- Ali followed up on beam energy spread in SIMC
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  - Gaskell thinks that it's a non-issue.  0.05% is OK, maybe even too big
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- Richard Heep Data/SIMC comparison
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  - half of his data had a 40ns CT offset compared to the rest of the same
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    setting
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  - needed to adjust the offset and replay again
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  - data/MC comparisons look much better now
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- Ali still tracing differences in Pmiss Emiss calculation between hcana and
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  SIMC
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  - he feels more inclined to make SIMC calculation the same as hcana than the
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    other way around.  Found some issues with over-written variables in SIMC
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    (seems a bit strange to GH)
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Next meeting
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------------
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- Tue Jun 28 @ 11:30 Eastern, immediately after RC meeting
(57-57/412)