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Kaon LT Meetings » mtg_23dec21.txt

Garth Huber, 12/21/2023 05:49 PM

 
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                 Dec 21/23 PionLT/KaonLT Analysis Meeting Notes
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                 ----------------------------------------------
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                              (Notes by GH)
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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 - Garth Huber, Ali Usman, Muhammad Junaid, Nathan Heinrich, Vijay Kumar,
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   Nacer Hamdi
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JLab - Dave Gaskell
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FIU - Pete Markowitz
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CUA - Richard Trotta, Tanja Horn
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Richard
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-------
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Weight iteration script for LT-separations
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- working on script to fit separated cross sections to get parameters for next
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  iteration, other parts done
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Heep analysis
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- made a nice table of efficiencies and associated uncertainties for Heep and
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  Physics data analysis
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- HGC cuts to select K+ after discussion with Peter Bosted:
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  - place a cut around HGC hole to reduce pi+ leakthrough
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    - *NOTE* will need to place SAME CUT on SIMC
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  - place a NPE<1 cut to eliminate pions
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    - DG: the cut can be fairly tight since K+ are below HGC Cherenkov
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      threshold, there will be NPE from knock-on electrons, but it shouldn't
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      make too much difference whether the cut is at 1 or 2 NPE
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    - *NOTE* will need to find the correction factor (a few %) for the K+ with
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      knock-on electrons that are removed by this cut
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- Calorimeter Efficiencies per spectrometer setting, not beam energy
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  - DG: need a dedicated study to determine these efficiencies, not from the
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    report files
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  - AU: this study was done earlier.  Looked at Heep singles data w/low pi-
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    contamination
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    - some Heep settings had P_HMS above Cherenkov threshold, and could not
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      be used
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    - DG: the efficiency should plateau for momenta > ~3 GeV/c, it would be
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      okay to extrapolate this number to higher momenta above the Cherenkov
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      threshold, the issue is the efficiency at very low HMS momenta
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    - DG: need a fit or lookup table for efficiency vs P_HMS
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- Heep Data/MC yield ratios
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  - when removing HGC cut on Heep analysis, W shifted by ~0.1 MeV, this affects
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    data/MC yield comparison
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  - Yield ratios have a linear trend vs. Q2 that needs more investigation
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    - no error bars are plotted yet
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    - suggest to have simple PID cuts for Heep COIN since so clean, try to
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       make the analysis as robust as possible
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  - Vijay has a much flatter yield ratio plot, so the difference needs to be
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    understood
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    - GH+TH: Vijay and Richard should communicate by email on exactly what cuts
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      and efficiencies are applied to the Heep data, so the major parts of
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      their analyses can be compared
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- LH2 boiling correction
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  - discussion about the calculated uncertainties and how they should vary with
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    current, RT gets a surprisingly large increase in uncertainty with current
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  - Eqn 5.22a,b on Boiling Correction in Carlos Yero's thesis
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  - TH: Carlos' eqn is absolute error in the boiling correction, you can't
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    apply this formula without modification for percentage error
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Ali
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---
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piDelta BSA
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- looking into rho decay contribution, running SIMC
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- working on script to combine L,C,R SHMS settings
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- next will look at higher Q2 settings, and rerun SIMC w/ offsets
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Dave
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----
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Looking into MM resolution issues
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- Run 4920, Q2=2.115, P_HMS=5.292 GeV/c
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  - HMS-delta vs MM: see a clear linear correlation
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  - HMS-delta vs xptar,yptar: also see some correlation (more complicated with
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    some curvature)
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  - clearly indicates some optics issues that can account for the wider MM peak
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    compared to SIMC
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- AU: the KaonLT replay used a dedicated set of Matrix Elements for P_HMS=6.5
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  GeV/c, but nothing special for 5.3 GeV/c
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- next step is to look at MM vs Focal Plane variables, to see if there is a
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  linear correlation that can be removed with an ad-hoc correction
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Vijay
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-----
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Low Q2 lumi and Heep analysis
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- Carbon-12 HMS, Heep yields vs current
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  - found a small bug in the script used to produce last week's plots
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  - in addition, was previously using statistical error in EDTM study, now
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    using 2% uncertainty in EDTM livetime from Carlos Yero's thesis
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  - the issue is that in KaonLT, the EDTM could only be set manually from the
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    electronics room.  For many runs we did not have enough EDTM events, and it
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    was difficult to monitor this during the data taking.
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Heep Data/MC yield ratios
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- plot has a small linear dependence with Q2, but error bars at high Q2 are
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  fairly large
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- DG: surprised the error bar is so large at Q2=3.75
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  - the run sheets show 3x40k events for this setting
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  - Vijay will confirm what was done, possibly only 1 run was analyzed instead
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    of all three
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Nacer
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-----
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Drift Chamber calibration checks after new Hodo calibs
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- still debugging DC calib scripts, trying to adapt PionLT code to KaonLT
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  - discussing with Junaid
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Nathan
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------
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Coincidence Reference times
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- finished on Monday, CoinTime now centered at zero and sharper for all runs
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- changes pushed to GitHub
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Full replay script
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- working w/ Junaid on the script and checking
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Junaid
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------
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- merged all Nathan's changes to GitHub
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  - everything is set up, but problems on including Helicity variables in
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    replay
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  - Ali can point to which script to use
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- All Events No EDTM for all runs except Lumi, which will be All Events
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- hope to submit full replays soon, and will monitor them over holidays
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After the replay is done:
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- Junaid will work on Tracking Efficiencies
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- Nathan will work on Lumi
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  - will start with scaler and UnTracked yields analysis which are independent
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    of Junaid's work
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  - depending on Junaid's progress, will pivot to PID analysis if tracking effs
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    not ready when needed for Tracked Lumi analysis
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Next Meeting
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------------
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- Thur Jan 4 @ 15:00 Eastern/14:00 Regina
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  - PionLT will go first
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Hoping everyone has a good holiday.  Merry Christmas and Happy New Year!
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