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Jan 16/25 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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Present
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-------
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Regina - Garth Huber, Alicia Postuma, Nathan Heinrich, Vijay Kumar,
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Nacer Hamdi
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CSULA - Konrad Aniol
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FIU - Pete Markowitz
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Virginia - Richard Trotta
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CUA - Tanja Horn
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Ohio - Julie Roche
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Richard
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-------
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KaonLT analysis
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- would like to start looking at Q2=4.0, Q2=3.0, W=2.32 which are at same xB
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- Q2=3.0, W=2.32 still looks weird, very early early SIMC iteration
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- sigT>sigL which is fine, but sigL<0 which is not fine
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- R=Data/MC ratios ahve large decreasing trend with t
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- not shown, but apparently also the variable comparos do not look good
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- it's important that both the variable dists and R look good
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- will spend more time on Q2=3.0, W=2.32 iterations
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- GH: it is not unlikely that you will need a different parameterization for
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the settings near W~2.3 compared to those with W~3.0
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Vijay
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-----
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PionLT Q2=0.42 analysis
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- fixed timing offsets
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- double checking PID cuts
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- will have to deal with same issue as at Q2=0.38, which is low HMS momentum
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at low epsilon
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- promises some data plots for all 3 epsilon next week
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- then will make new diamond cuts and start SIMC simulations
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- Note: Q2=0.42 is a total of 11 settings, while Q2=0.38 had 12 settings
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Alicia
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------
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Quick update on Geant4 proton absorption code
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- issue w/ S2Y quartz plane, zero energy deposition
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- Cherenkov rather than scintillation process
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- need to manually specify index of refraction of material vs wavelength
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- have index indep of wavelength now as a placeholder
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- still no energy deposit, but getting nonzero NPE, still investigating
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Nacer
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-----
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KaonLT Q2=0.50 analysis
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- now Background (Dummy and Random) subtracted
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- then subtract small pi+ leakthrough
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- looks very clean underneath Lambda and Sigma peaks after subtraction
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- further investigations of cause of MMk shift between data and MC
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- was loading the wrong offset files, consulted with Ali
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- switched to correct offset file, but shift is worse now, 50 MeV vs 40 MeV
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- also gbeam.param file was 2019 instead of fall 2018 values
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- also compared to online MMk plot
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- at this point we realized that it is SIMC that is in the wrong spot, not
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the data (silly us)
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- Lambda(MC) is at 1.16 instead of 1.1156
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- *NB* need to apply recon.hcana after SIMC, so that MMk reconstruction is
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same between data and MC
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https://github.com/trottar/simc_gfortran/tree/fall_2023_kaon_xsects/recon_hcana
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run.simc.tree runs recon.hcana after SIMC
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- Note added on Friday, Nacer identified source of problem
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- was using Junaid's version of recon.hcana which had hardcoded pi+ mass
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instead of K+ mass, this would give a ~50 MeV shift in the correct
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direction
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Nathan
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------
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PionLT Lumi Analysis
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- uncertainties now included correctly in boiling correction
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- also has rate dependence vs 3/4-Rate instead of ELREAL
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- obtains a slope in scaler analysis of 2.9+/-0.2%/MHz
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- some discussion about the combinatoric ELLT spreadsheet by D.Mack
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- this gives a better calculation of ELLT than the simple exponential
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dependence with rate
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- was applied to pre-KaonLT data which had less reliable EDTM and needed to
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use CPULT and combinatoric ELLT
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- we need to see if after applying the combinatoric ELLT Nathan's rate
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dependence slope becomes flat(ter?)
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- For both KaonLT and PionLT, EDTM is reliable for COIN and 1 arm Singles,
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but not combined HMS+SHMS Singles runs
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- we will have to think carefully on whether we need to apply a rate
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correction or not, it is important for Nathan to do more investigations
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of the Coin Lumi runs to sort this out
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- *NB* Nathan will look at combinatoric ELLT spreadsheet and try to globally
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understand things
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Next Meeting
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-------------
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- Thur Jan 23 @ 15:30 Eastern/14:30 Regina
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- PionLT will go first
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