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Sept 19/24 PionLT/KaonLT Analysis Meeting Notes
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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, Nathan Heinrich, Muhammad Junaid, Alicia Postuma,
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Ali Usman, Nacer Hamdi
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CUA - Tanja Horn
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Virginia - Richard Trotta
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JLab - Dave Gaskell, Peter Bosted
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Ohio - Julie Roche
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CSULA - Konrad Aniol
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Nathan
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------
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PionLT Lumi Analysis
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- new plotting scripts ready, working on getting COIN Lumi analysis working
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- hoping to show results next week
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Junaid
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------
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PionLT Heep Analysis
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- Diagnosing Low SHMS 3/4-Hodo Efficiencies
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- trying to understand if drop in efficiency at higher momentum is due to
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rate
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- Subdivide 3/4-Eff data into momentum ranges and plot vs rate
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- Heep Runs 11860-16517
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- no obvious rate dependence, drops in eff are in groups for certain settings
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- emails w/ Mark re Low 3/4-Effs, he is taking a closer look
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- checking EDTM live times
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- >99% for both Heep and Physics
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- differently from KaonLT, the EDTM-LT seems to be reliable for PionLT, which
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is good news
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- updated Data/MC Ratios
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- recalculating ratios using 3/4-Eff instead of Report File eff for higher
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momentum, using report file 3/4-Eff for P_SHMS<2.5 GeV/c
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- get ratios of 0.995-1.025 before applying proton absorption correction
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- moves in the right direction, but ratios still too high
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- LH2 boiling correction
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- using Richard's correction, about 6%/100uA
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- Dave: note that Dave Mack got 2.26+/-0.30%/100uA from Fall 2018 scaler
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analysis
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- *NB* should look more closely at this, it would help the ratios
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Next steps
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- implement effective charge uncertainty in yields script
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- start working on proton absorption correction
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- will attend next weekly Optics Meeting to see the status of higher P_HMS
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matrix elements
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Richard
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-------
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Diagnosing weird ratios in KaonLT High Q2 L/T-separations
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- running tests using one of Vijay's settings, to look for differences between
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his analysis and Vijay's
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- Q2=0.38 low eps, center setting
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- shows plots of pi+n MM peak compared to version in Vijay's thesis
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- BLACK=data RED=MC
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- Vijay's data and MC are centered at correct value, reasonable agreement
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on width
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- Richard has MM peak shifted to left, by different amounts for data and MC
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- Tanja: *NB* suggest to try using Vijay's ROOT trees directly, instead of
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new hcana analysis, to diagnose what's wrong
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- will also look into CoinTime cut, since there is a shift in distro between
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Vijay and Richard
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Alicia
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------
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BSA pi+ paper: Implementing referee suggestions
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- will use new title suggested by editor and referee
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- moved A_LU definition earlier in paper, also definitions for sig_0, sig_LT'
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- still need to calculate pi+ det efficiency and purity numbers
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- adjusted some paragraphs so systematic uncertainty discussion is in 1 para
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- chi-square analysis for theory vs expt, and discussion on model significance
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in progress
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- 1st point of data extends to left of theory region, i.e. they have
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different -t_min, because theory is evaluated only at central kinematics,
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and not separate (Q2,W) of each point, for this reason, it is excluded from
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the chi-square calculation
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- YCK1 has best chi-square
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- VR is 2nd best fit for our data only
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- at Q2=3.0, where CLAS data at higher -t is included, VR does worse
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- could include chi-square table for different models in Supplmentary
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Material
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- B-G Yu replied that he will let us say what we want about the model
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significance
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- expecting to circulate a new draft next week
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Ali
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---
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KaonLT pi+Delta0 BSA analysis
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- working on thesis
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- redoing A_LU and sig_LT' plots, will include CLAS pi0Delta++ results (with
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sign flipped)
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- input received from PeterB re piDelta MC peak shape
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- wanted to make sure we're using the updated algorithm in SIMC
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- includes a lookup table for relativistic corrections to simple BreitWigner
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shape, which should result in improved agreement with data
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- responded that we're using the latest SIMC version
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- there is a bit of mismatch between data and MC on left side of Delta, due
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to tail coming from exclusive pi+n
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- will assess a systematic uncertainty on the tail mis-fit
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- will be at APS-DNP meeting in early October, will circulate slides ahead of
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next week's meeting
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Nacer
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-----
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KaonLT Heep analysis
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- plot of Hodo-3/4 efficiencies vs Trigger Rate
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- getting 92-98% efficiencies
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- no clear correlation with rate
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- plot of Hodo-3/4 efficiencies vs P_SHMS
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- planes 3,4 have particularly bad 3/4-Effs
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- same curious drop at higher momentum as in PionLT
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- Dave: *NB* Log entry from Simona suggesting higher momentum protons should
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have higher efficiency in quartz bars:
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https://logbooks.jlab.org/entry/3564126
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- Ali shows plot of 3/4-Eff vs SHMS-Rate for KaonLT Physics runs
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- Effs ~98-99%
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- Heep has an efficiency problem, but physics data does not
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- *NB* PeterB makes an excellent observation:
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- apparent rate in a selected region of SHMS focal plane in Heep is much
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higher than the average rate, because not the whole focal plane illuminated
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- suggests to put cuts on HMS to select narrow band of electrons
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- Dave: this is very hard to do in the standard analyzer
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- Peter: yes, you have to do it in a special analysis
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- started working on Heep singles analysis
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- checking w/ Junaid on analysis scripts and w/ Ali on replay scripts
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Next Meeting
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-------------
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- Thur Sept 26 @ 16:30 Eastern/14:30 Regina
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- KaonLT will go first
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