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Kaon LT Meetings » mtg_22jan05.txt

Garth Huber, 01/15/2022 03:31 PM

 
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		Jan 5/22 PionLT/KaonLT Analysis Meeting Notes
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Participants:
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 - Richard Trotta, CUA
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 - Pete Markowitz, FIU
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 - Dave Gaskell, JLab
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 - Jacob Murphy, Ohio
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 - Nathan Heinrich, Garth Huber, Muhammad Junaid, Stephen Kay, Vijay Kumar,
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   Love Preet, Ali Usman, Regina
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Meeting slides are posted at:
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https://redmine.jlab.org/projects/kltexp/wiki/Kaon_LT_Meetings
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Richard
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-------
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1) Analysis Task List
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- shows updated high Q2 timeline posted at
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  https://redmine.jlab.org/projects/kltexp/wiki/Analysis_Tasks
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- generally looks good
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- need to break-down more division of tasks with Ali
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- also suggest to coordinate low Q2 task list schedule with Vijay
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- update the RedMine list with both of these
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2) EDTM studies
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- plans to do more studies this weekend
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Vijay
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-----
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1) Low Q2 Heep-Singles Study
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- unlike the Heep-Coin study, which has reasonable (early) agreement between
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  data and SIMC, the Heep-Singles yields disagree substantially between data
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  and SIMC
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- Suggestions:
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  - Remove H_hodo_goodscinhit cut
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  - Increase p_arm generation limits by 2-3x
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  - add ytar, xtar plots, so we can see them too
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  - set beer_can target=1 instead of tuna_can target=2 in SIMC.  In the longer
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    term, we will need to modify SIMC code for the actual target geometry used
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    in KaonLT/PionLT
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  - it looks like there is a hole in the SHMS focal plane.  Since an HGC cut is
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    used, this is likely caused by the inefficient region in the center of the
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    detector.  For yield studies, it is better to just remove the HGC cut since
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    Heep-electrons should be fairly clean.  However, for validation of the
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    physics analysis (which will require the cut), we should do a second
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    Heep-singles analysis with the cut included in both data and SIMC, so we
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    can compare their effects.
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  - Dave notices that the target thickness is wrong in the SIMC input file, 4cm
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    instead of 10cm.  Undoubtedly this will make a big difference.
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Nathan
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1) Analyzing the new Mode-10 variables in PionLT data
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- Nathan summarizes the new Mode-10 variables that Mark Jones has implemented
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  in hcana (see slides).
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- Mark's intention is to re-create in software from the waveform data, the
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  equivalent variables that are output by the FADC, so their differences can be
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  studied and understood.  There are a lot of new variables to study and
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  understand.  Mark has done a cursory check, and wants Nathan to look at them
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  in more detail, and look for problems.
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- Still having some difficulties getting the new hcana to compile.
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2) SIDIS Lumi Study
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- yield study looks encouraging.  
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  - HMS singles: Scaler rate dep <2.5%.  Untracked rate dep < 2.0%.
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         Tracked: linear rate dep that needs to be understood.
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  - SHMS singles: Scaler rate dep <5.0%.  Untracked <8.0%.
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         Tracked: same linear rate dependence as HMS.
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  - COIN: since randoms dominate, expect a linear rate dep, which is observed
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    for scaler analysis.  But untracked and tracked analyses see a linear drop
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    with rate (instead of increase) which needs to be understood.
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  - Nathan has implemented an untracked COIN variable for use in the untracked
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    COIN analysis.
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  - need to loosen PID cuts to avoid rate dependence, as the cuts might be a
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    bit tight.
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Jacob
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-----
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1) EDTM Analysis Summary
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- shows two T.coin.pEDTM_tdcTimeRaw timing plots that are particularly interesting.
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  - overlapping distns of EDMTs coming at different times when using PS2,4
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  - when using PS1,3 they are separated, so it's easier to tell what's going on
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** For future Lumi studies, we should probably use PS1,3 so they are separated,
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   as this allows an independent check of the PS factor operation
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- still has TLT>100%
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  - equation on slide 2 doesn't take into account the physics triggers which
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    adjust the number of EDTM events prescaled away.
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  - needs to think more on modifying the equation for added physics triggers
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    and see if this improves the TLT values
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Next Meeting: Wed Jan 12 @ 11:00 Regina/NOON JLab time
(5-5/412)