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Sept 26/24 PionLT/KaonLT Analysis Meeting Notes
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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, Alicia Postuma, Muhammad Junaid,
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Nathan Heinrich, Nacer Hamdi
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CUA - Tanja Horn, Casey Morean
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Virginia - Richard Trotta
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Ohio - Julie Roche
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JLab - Peter Bosted
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Richard
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-------
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KaonLT Analysis
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- investigating MMpi shift issue from last week
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- looked at hcana, CoinTime offset
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- waiting on Vijay to send his ROOT files, hasn't heard from him in a while
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- Tanja: an open collaboration requires access to ROOT files and the code
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used to generate them, as it required for validation of results
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- we really need to communicate with Vijay on this
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Alicia
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------
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Addressing BSA referee comments
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- pion PID purity and efficiency
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- applied generous HGC hole cut and HGC_npe>3 cut to select cleaner sample of
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pion events
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- found evidence of a small proton contamination at low MMpi
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- applied same MMpi<0.91 cut as used by Vijay
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- new results with MMpi<0.91 cut
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- mean t-value per bin shifts slightly
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- two BSA points move about 0.5sigma, others barely move at all
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- lowest -t bin at Q2=3.0, x=0.40 shifts upward
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- second highest -t bin at Q2=3.0, x=0.25 moves a bit too
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- planning to include this variation as an additional cut dependence
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systematic uncertainty
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- pion efficiency:
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- denominator: physics(includes AERO_npe>3 cut) * HGC_hole * HGC_npe>3
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- numerator: remove AERO_npe>3 cut
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- efficiency=97%
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- Peter: this sounds reasonable
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- pion purity (first estimate):
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- denominator: physics(includes AERO_npe>3 cut) * HGC_hole * HGC_npe>0
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- numerator: same but HGC_npe>3 cut
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- this really sounds more of an efficiency, not a purity
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- Ali: take a look at pion purity discussion in Bircu's thesis
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- Peter: purity depends on kinematics, while efficiency does not
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- after applying a tight MMpi cut, would expect inpurity to be very small
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- will need to think more on exactly how to reply to referee on this
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Nacer
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-----
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KaonLT Heep analysis
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- setting up analysis for Heep singles
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- Junaid had a Heep singled analysis framework from PionLT online analysis
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- this has been adapted to KaonLT, replaying 3.8GeV data now
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- 10.6GeV Heep CoinTime plot
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- when completely removing CoinTime and HMS_beta cuts, the yield changed 10%
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- will review cuts on log scale to make sure they're appropriate
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Junaid
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------
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PionLT Heep analysis
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- effective charge uncertainties now included
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- SHMS_beta plot
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- get some zero bin entries, if place beta>0.2 cut, Heep ratios drop a few
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percent
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- Peter: in hcana, the beta calculation requires 4/4 planes hit, otherwise
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beta=0 is assigned, the #entries at beta=0 reflects the difference between
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4/4 and 3/4 efficiencies
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- Peter: SHMS_beta cut not useful for P_SHMS<2 GeV/c, and even then, you can
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deal with the same PID info with CoinTime and RF cuts
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- Peter: recommends to ignore SHMS_beta, just check to make sure peak is near
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1 to be sure the timing corrections are good
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- Tanja and Garth agree, don't apply a SHMS_beta cut, if you do, you would
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have to correct for 4/4 efficiency to get the same result
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- proton absorption correction
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- Peter: raises the same issue with protons rescattering and still causing a
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trigger that was raised earlier
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- we discuss putting together a simple Geant4 simulation that would do a
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better job of estimating the correction than the simple spreadsheet
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- would only need thin slabs of material to get the correction, not
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detailed geometry
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- the spreadsheet already includes relevant information
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- Alicia volunteers to work on this after her comprehensive exam is done
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- SHMS-3/4 efficiency
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- consulted with Mark on this, waiting for more information
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- Peter: agrees that the efficiency should be high
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Next steps
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- will work on SHMS pion PID and setting up pion detector efficiencies
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Nathan
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------
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PionLT Lumi studies
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- first plots from 2021 Coincidence scan, Runs 12218-12258
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- some crazy CPULT so clearly needs more work
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- replaying 2022 Coin lumi data
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Ali
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---
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Overview of DNP talk on piDelta BSA
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- shortening talk to fit into 10+2 format, was set up for 12+5
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- will include CLAS pi-Delta++ results
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- will circuate draft this weekend, talk is on Oct 8
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Next Meeting
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-------------
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- Thur Oct 3 @ 16:30 Eastern/14:30 Regina
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- PionLT will go first
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