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Kaon LT Meetings » mtg_24oct03.txt

Garth Huber, 10/04/2024 04:05 PM

 
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                 Oct 3/24 PionLT/KaonLT Analysis Meeting Notes
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                 ---------------------------------------------
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                                (Notes by GH)
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                     Today: PionLT 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 - Garth Huber, Muhammad Junaid, Nathan Heinrich, Vijay Kumar,
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   Nacer Hamdi, Alicia Postuma
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FIU - Pete Markowitz
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Ohio - Julie Roche
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Virginia - Richard Trotta
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CUA - Tanja Horn
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JLab - Dave Gaskell
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Nathan
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------
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PionLT COIN Luminosity studies
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- made a mistake in setting up scripts, had e+ tracking eff instead of proton
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  in SHMS
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- replaying files again, hopefully will have some results for next week
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Junaid
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------
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PionLT PID studies
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- completed HMS e- selection
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- now doing SHMS pi+ selection
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  - using 9.177 GeV data
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  - using RF time, Aerogel, HGC to select clean sample
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  - will look at 3 physics settings, one where SHMS is at 5.5deg to check for
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    backgrounds
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- planning to have a report next week
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Richard
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-------
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KaonLT LT-separations
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- looked at W-dependence, comparing Q2=3.0, W=3.14 with Q2=3.0, W=2.32
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- adjusted exponent in Wfac=1/(W^2-mp^2)^n from n=2.0 to n=2.25 and n=3.40
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  - Tanja's global K+ analysis had n=2.25
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- seems to put ratios near 1 instead of 0.3-0.5
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  - Dave: confused about this.  Changing the exponent should only afffect the
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    Data/MC ratio for 1st iteration, but ratios would get rescaled in further
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    iterations
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  - Richard: the ratio seems to persist near 1 for first few iterations, will
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    try more
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- will look at both Q2=3.0 settings for comparable t-ranges and see what is
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  best value of exponent
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  - would try different n manually, not as a free parameter in the fit
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  - then would look at other Q2 settings, to see if a global n value works or
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    not
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Vijay
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-----
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Low Q2 PionLT systematic uncertainties
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- earlier studies showed HMS delta was very sensitive to +/-10% change in cut
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  value (as in Tanja's thesis)
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  - Dave: should not go past +/-8% HMS delta range, as Matrix Elements are not
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    as well constrained.  In general, for both spectrometers keep within the
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    nominal cuts and only make them tighter, not looser
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- found that only the low epsilon data covers +/-8% delta range, mid and high
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  epsilon data do not fill whole focal plane, due to the applied diamond cut
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  (obvious in retrospect) and are not affected by the +/-10% cut variations
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  - doing an LT-separation with this cut will not make sense, as the cut
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    variation effectively makes the diamond smaller for low epsilon data, but
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    not the mid or high epsilon data
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- will compute sig_UNS instead, for only low epsilon data
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  - this will be more comparable to the study shown in Marco's thesis
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Data replay and preservation
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- planning to replay Q2=0.42 data next week
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- unfortunately, the Q2=0.38 data were not backed up, will replay it as well
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- Tanja: it is important to also archive the code used to generate the data, so
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  they're linked together
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- Tanja: it is also important to do some tests to make sure the new Q2=0.38
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  replay is not different than the old one
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Alicia
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------
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BSA manuscript changes
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- please review the draft manuscript on OverLeaf
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- went through draft response to editor and Referee B
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  - incorporating GH's comments then will circulate to group via PDF
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- would like to resubmit to PRL by Oct 11
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Nacer
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-----
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KaonLT Heep singles
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- finished replays
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  - need to set up config files for report files
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- Junaid sent SIMC configuration files for singles
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Next Meeting
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-------------
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- Thur Oct 10 @ 16:30 Eastern/14:30 Regina
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  - KaonLT will go first
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