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Kaon LT Meetings » efficiencies_22may25.txt

Garth Huber, 05/26/2022 07:08 PM

 
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      Meeting to discuss Kaon-LT Efficiencies for Normalized Yield
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                               22-may-25
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Attendees: Garth Huber (GH), Stephen Kay (SK), Ali Usman (AU), 
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   Vijay Kumar (VK), Richard Trotta (RT)
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Richard
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-------
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- Python script to grab info from report file
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   - Some temporary parts for now
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   - Aim is to have multiple scripts called by one main script (which then runs
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     all of the others that are needed)
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   - GH - Q on version management
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   - RT/SK - *Should* be handled by GitHub w/o issue, so long as it is
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     committed frequently
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   - Each script will create a dictionary, they will be combined to a dataframe
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     which is saved to a .csv file
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   - GH Q - What is needed still?
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   - RT A - Some info still missing, CPULT, time of run etc
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      - No efficiency erros on the hodoscopes
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      - CT blocking efficiencies
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      - Run length, beam on time with current cuts applied
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   - Concern on run length (after current cut) determination
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      - Hard wired 5uA cut?
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      - Needs to be more flexible
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      - To do so, would probably need to be in a script
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      - Did we ever even get below 5uA for KaonLT/PionLT2019?
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         - Set it to 2.5uA as a threshold?
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         - Should work for all physics settings
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   - HeePCoin efficiencies, need HMS and SHMS still *if* we use these
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Ali
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---
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- Discussion on TrackEff for Singles and Coin events.  The discussion turned
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  out to be extremely useful, as we discovered some misunderstandings on what
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  was being done.  
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   - Analysis currently removes any non-coincidence events almost immediately,
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     so all effs are calculated only from Coin events
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   - The issue is that the detector efficiencies are presumably driven by the
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     raw particle flux incident on the detector, and this corresponds most
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     closely to the Singles event distribution.  Coins have a hardware
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     requirement of a coincidence with the other spectrometer, so even if no
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     further cuts are applied on the "other spectrometer" the distribution of
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     hits across the detector will reflect this, and likely will be different
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     than the "raw flux"
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   - In addition, the statistical error in the efficiency is likely to be
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     smaller from the Singles events than from the Coins (at least this was the
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     case in Fpi-2)
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   - *Need specific "coin and single" efficiencies for any strongly rate
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     dependent efficiency, so that differences between them can be checked and
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     understood*
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      - Need to modify cuts file used in online data
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      - Compute both ways (from Singles events and from Coin events) for
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         - Gas cherenkovs
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         - DC
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         - Tracking
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         - CPULT
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      - Also need to propagate these changes into the offline KaonLT scripts
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   - Good idea to *Date tag and version the .csv file created by the script*
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     i.e. not the date the .csv file was created, but the date-version of the
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     script used to create it
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- GH: What do we need for this in the next week to 10 days to try to get
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  normalised yields?
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   - AU - Mark asked for a document on Hodo Effs calculation
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     - need to trace through hcana on variables to be used
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   - AU - Need exact cuts for other aerogel trays for different indices of
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     refraction
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      - Need them from a quick analyis, *not* the positions as recorded on the
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        flat tray
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      - Will need cuts, in principle, per tray installation, as the aerogel can
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        shift in the tray during craning operations
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      - RT will get these numbers to Ali
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Next meeting: Thur June 2 @ 17:00 Eastern/15:00 Regina
(52-52/412)