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Kaon LT Meetings » mtg_23feb16.txt

Garth Huber, 02/16/2023 07:28 PM

 
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                Feb 16/23 PionLT/KaonLT Analysis Meeting Notes
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                 ----------------------------------------------
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                           (Notes by GH and SJDK)
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                    Today: KaonLT will be discussed first
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Please remember to post your slides at:
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https://redmine.jlab.org/projects/kltexp/wiki/Kaon_LT_Meetings
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Present
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-------
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Regina - Stephen Kay, Garth Huber, Ali Usman, Alicia Postuma, 
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   Nathan Heinrich, Vijay Kumar, Love Preet, Muhammad Junaid
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JLab - Dave Gaskell
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Ohio - Jacob Murphy, Julie Roche
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CUA - Richard Trotta, Tanja Horn
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CSULA - Konrad Aniol
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Richard Updates
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---------------
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Changes to PM/EM calcs in SIMC
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- Debugged ROOT issue, was overwriting old histos
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   - DG: Script should write new tree and retain old tree, so you can compare
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     them directly
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- Results have some unexpected featuers, will discuss with DG in more detail
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  tomorrow morning
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LT-sep code
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- rewriting the part of code that tabulates the normalized yields, rathern than
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  debugging Bill's version
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   - GH: yes, this makes sense.  The yield calculation is experiment specific,
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     and is best to be written from scratch
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   - it doesn't matter which variable is integrated to determine the yield, but
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     as Vijay found earier, it's good to try integrating more than one variable
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     as an initial test, to make sure they give identical results
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Batch job submission implemented and working
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PID Cuts, CT Cuts
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   - Left/Right/Cent
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      - Dummy + rand sub
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   - Does order of cuts, diamond vs dummy/random matter?
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      - Diamond cut is set based upon shape of low espilon diamond, it is
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        defined by  spectrometer acceptance, and will be the same for
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	dummy/random
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   - DG - Do diamond cut before the dummy/random subtraction since the cuts
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     need to be applied on an event-by-event basis
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      - Diamond cuts - > switch order of this, do this before dummy + rand
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      - Phi/t binning -> also do this before the dummy/random sub
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      - Get sample, then do dummy + random subtraction per phi/t bin
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      - obtain yields per phi/t bin after applying all corrections and cuts
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- Ran all SIMC for all Q2 values for the kaon analysis
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   - 5.5, 4.4
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- With all of this info, *should* be able to run fortran script
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- TH: Q - Looking at CT spectrum, two random peaks near first central peak
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   - RT: Seeing similar with other runs
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   - TH: Q was what these were, was this resolved?
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   - RT: Seems to be an issue with the right setting, some bug for this?
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      - CT cut issue?
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      - Right setting CT cuts don't seem to be getting applied correctly?
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Ali Updates
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-----------
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Follow up from last week's slides re. cal and HMS-Cer efficiencies
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- Reviewed run sheets for all HeeP singles data in KaonLT run periods
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   - Selected a few settings where momentum of HMS < pion threshold
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   - Using these to get efficiency values
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- had some issues with replay script and needed to resubmit the jobs
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   - Promises lots of plots next week
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Vijay Updates
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-------------
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Checked t resolution using SIMC
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   - Q2 = 0.38, low eps, central SHMS setting
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   - How wide is second t bin? 0.004 -> ~4x larger than resolution (and this is
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     probably the worst case)
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   - t resolution does get worse with bin
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   - GH: Should compute ratio of width of bin to resolution
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     - i.e. how many sigma is each bin in width
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   - a check for a high epsilon setting should also be done, since the beam
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     energy is higher, the expected resolution will be worse
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t-/phi binning
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   - 8 t bins
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   - 16 phi bins, same as in Tanja's thesis
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- Looked at LTsep fortran scripts
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- DG: Make upper edge of MMPi peak cut bigger - 0.98 upper edge rather than
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   0.96, so as to be in the flatter part of the radiative tail, since there is
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   no evidence of inelastic events in the data
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   - Shouldn't make a huge difference in the yields, but this will reduce the
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     cut sensitivity systematic error, which is desirable
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Jacob Updates
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-------------
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- Ill for last week
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   - Get well soon!
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Nathan Updates
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--------------
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Follow up to LD- setting finding from last week, where the number of counts
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after RefCut optiization was lower than Online stats
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   - Wrong NGC cut, fixed
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      - ... but this didn't change anything!
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   - GH: Should check online conditions to see if we're comparing things that
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     are really the same #runs, etc
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   - NH: it should be possible to reanalyze the data using online settings to
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     check
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   - one question last week was if runs were missing between online/offline
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   - NH: checked this, and couldn't find anything wrong
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   - definitely merits more investigation, since if the #events is really lower
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     than online then there is something wrong with the RefCut optimization for
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     this setting
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Junaid Updates
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--------------
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- Submitted NP assignments, should be caught up by next week
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- Will look at calibrations shortly
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- Set up weekly JJN meetings similar to the RAV meetings
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   - Wednesday afternoon
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   - 14:00 Regina/15:00 Eastern
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Next Meeting
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------------
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Thur Feb 23 @ 17:00 Eastern/16:00 Regina/15:00 Mtn/14:00 Pacific
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- PionLT will go first
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