Meeting to discuss Kaon-LT Efficiencies for Normalized Yield
                               22-may-25

Attendees: Garth Huber (GH), Stephen Kay (SK), Ali Usman (AU), 
   Vijay Kumar (VK), Richard Trotta (RT)

Richard
-------
- Python script to grab info from report file
   - Some temporary parts for now
   - Aim is to have multiple scripts called by one main script (which then runs
     all of the others that are needed)
   - GH - Q on version management
   - RT/SK - *Should* be handled by GitHub w/o issue, so long as it is
     committed frequently
   - Each script will create a dictionary, they will be combined to a dataframe
     which is saved to a .csv file
   - GH Q - What is needed still?
   - RT A - Some info still missing, CPULT, time of run etc
      - No efficiency erros on the hodoscopes
      - CT blocking efficiencies
      - Run length, beam on time with current cuts applied
   - Concern on run length (after current cut) determination
      - Hard wired 5uA cut?
      - Needs to be more flexible
      - To do so, would probably need to be in a script
      - Did we ever even get below 5uA for KaonLT/PionLT2019?
         - Set it to 2.5uA as a threshold?
         - Should work for all physics settings
   - HeePCoin efficiencies, need HMS and SHMS still *if* we use these

Ali
---
- Discussion on TrackEff for Singles and Coin events.  The discussion turned
  out to be extremely useful, as we discovered some misunderstandings on what
  was being done.  
   - Analysis currently removes any non-coincidence events almost immediately,
     so all effs are calculated only from Coin events
   - The issue is that the detector efficiencies are presumably driven by the
     raw particle flux incident on the detector, and this corresponds most
     closely to the Singles event distribution.  Coins have a hardware
     requirement of a coincidence with the other spectrometer, so even if no
     further cuts are applied on the "other spectrometer" the distribution of
     hits across the detector will reflect this, and likely will be different
     than the "raw flux"
   - In addition, the statistical error in the efficiency is likely to be
     smaller from the Singles events than from the Coins (at least this was the
     case in Fpi-2)
   - *Need specific "coin and single" efficiencies for any strongly rate
     dependent efficiency, so that differences between them can be checked and
     understood*
      - Need to modify cuts file used in online data
      - Compute both ways (from Singles events and from Coin events) for
         - Gas cherenkovs
         - DC
         - Tracking
         - CPULT
      - Also need to propagate these changes into the offline KaonLT scripts
   - Good idea to *Date tag and version the .csv file created by the script*
     i.e. not the date the .csv file was created, but the date-version of the
     script used to create it

- GH: What do we need for this in the next week to 10 days to try to get
  normalised yields?
   - AU - Mark asked for a document on Hodo Effs calculation
     - need to trace through hcana on variables to be used
   - AU - Need exact cuts for other aerogel trays for different indices of
     refraction
      - Need them from a quick analyis, *not* the positions as recorded on the
        flat tray
      - Will need cuts, in principle, per tray installation, as the aerogel can
        shift in the tray during craning operations
      - RT will get these numbers to Ali

Next meeting: Thur June 2 @ 17:00 Eastern/15:00 Regina