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Aug 15/24 PionLT/KaonLT Analysis Meeting Notes
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----------------------------------------------
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(Notes by Dave and Alicia)
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Today: PionLT will be discussed first
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Present
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-------
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DG, Junaid, Nathan, Nacer, Zachary, Alicia, Richard, Ali, Pete
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Junaid
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------
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Showed Heep Em/Pm distributions vs. raster y and x.
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- After flipping sign on raster y calibration constants, correlation is greatly
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reduced (XEM2 also had to flip the sign).
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- Still some small remaining correlation.
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- DG suggests flipping sign on raster x calibration also - might impact
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reconstruction due to "ExtTar" corrections.
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Zachary and Nathan
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------------------
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Lumi scans from 2021.
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- Able to look at C and LH2 for 2nd scan, but only LH2 from 1st scan due to
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report output issues.
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- Scan 2:
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- Carbon yields are flat for all quantities (scalers, events w/out tracking,
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tracks).
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- LH2 scalers look "ok", but other qunatities show anti-boiling.
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- Total live time looks not plausible for some cases
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- DG suggest just using simple computer live time for 1st pass.
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- Scan 1: LH2 shows similar anti-boiling here.
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Nacer
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-----
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Looking at 8.2 GeV Heep data.
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- Large DATA/SIMC ratio (1.122+/-0.006).
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- Observed strange shape in HMS yptar distribution in data
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- excess at larger yptar.
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- Tried to look at that region to see if there are some strange
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backgrounds. Interestingly, when just looking at events from radiative
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tail, the yptar distribution looks more reasonable.
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- DG notes that he's seen similar issues in the DIS data from 2022-2023.
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- Suspect matrix element problem (we are using new matrix elements fit in
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2018).
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- Higher HMS momentum settings that use Jacob's matrix elements look better.
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- DATA/SIMC ratio likely not due to this yptar issue
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- DG is suspicious of the large dead time from the EDTM.
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- Suggests looking at computer live time again.
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Richard
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-------
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Shows results from his analysis of same Heep data.
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- Has even large DATA/SIMC ratio (~1.2), but this is likely due to smaller
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3/4 efficiency in SHMS (Richard sees ~92%, whicle Nacer sees ~97%).
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- Need to determine the origin of this difference between Richard's and
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Nacer's analyses.
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At this point, Dave had to leave. Alicia takes notes for rest of meeting.
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- Richard/Nacer will meet this week to discuss discrepancies between their
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results
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- Suggestion from Dave/Ali to compare EDTM vs CPU live times
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- EDTM LT drops to 90% for the 8.2 GeV run period, otherwise is stable around
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99%
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- Correcting EDTM should bring this point in line with the rest of the data
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- Still need to add error bars
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Plots of sigL, sigT, sigLT, sigTT vs -t
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- Same plots as last week with addition of Q2=4.4, W=2.74 setting
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- Currently working on Q2=3.0, W=2.32
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- New setting shows same general trends, but with some large outliers from
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previous fit functions
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- All settings normalized to W=3.0. W=2.74 may be too far away to normalize
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without better understanding the W-dependence (higher order terms may be
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required)
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- Suggestion from Ali to split data into two sets, with mean W=3.0 (3.14, 3.02,
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2.95) and W=2.5 (2.32, 2.74)
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- Meta-analysis post-publication of Q2, W-dependence etc may be very
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interesting
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Alicia
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-------------
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- BSA paper still under review
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- No update, studying for comprehensive exam
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Ali
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--------------
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- No update, writing thesis
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- Expect next updates in a few weeks
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Next Meeting
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------------------
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- Thur Aug 22 @ 15:00 Eastern/13:00 Regina
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- KaonLT will go first
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