Kaon_LT Experiment

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h1. *KaonLT/PionLT Weekly Meetings*

KaonLT/PionLT collaboration analysis meetings. Please add your talk to the meeting ahead of time. Add the newest meeting to the top of the list!

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h2. 2025 Meetings

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h3. October 10, 2025

* Garth's Notes attachment:

* Nacer

** Slides: attachment:20251010_kaonLT_nacer.pdf

** Compared SIMC abd Data missing mass plots, and SIMC lambda is well aligned with Data

** pion subtraction is good

* Richard

** attachment:KaonLTMeeting10_10_25.pdf

** Fit for both Q2 settings together (at W=2.22) for Fpi-2 look really good using the FiSAMi algorithm.

** Q2=4.4, W=2.74 are in a preliminary finalized state with everything looking very good with the current parameterization and functional forms. 

* Vijay

** Updated the pion and proton absorption and yield correction factors spreadsheet with their errors. 

** These corrections should be used for PionLT summer 2019 data.

** These should be final numbers as well.

** attachment:Vijay_Pion_Proton_Absorption_Corr_sheet.pdf

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h3. October 3, 2025

* Garth's Notes attachment:mtg_25oct03.txt

* Junaid

** Slides: attachment:LTSep_Analysis_03_Oct_2025.pdf

** Iteration v17: attachment:Iteration_v17.pdf

** Added a exponential factor in |t| term. Ratios indicate oscillations. Sigma TT looks fine, but sigmaLT needs to be changed.

** Iteration v18: attachment:Iteration_v18.pdf

** Modified sigma LT term. Still seeing oscillations. Sigma TT looks fine, but sigmaLT needs to be changed.

* Richard

** attachment:KaonLTMeeting10_3_25.pdf

** Early stages of testing my LT fit algorithm on separated xsect data. The Fpi-2 data is the initial check, with more to follow.

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h3. September 26, 2025

* Garth's Notes attachment:mtg_25sep26.txt

* Junaid

** Slides: attachment:LTSep_Analysis_26_Sep_2025.pdf

** Iteration v11: attachment:Iteration_v11.pdf

** Added a parameter to the denominator in the |t| term. Ratios have a bump in the middle. Sigma TT looks fine, but sigmaLT needs to be changed.

** Iteration v12: attachment:Iteration_v12.pdf

** Added a parameter in the |t|^power term. Ratios indicate oscillations. Sigma TT looks fine, but sigmaLT needs to be changed.

* Nacer

** Slides: attachment:20250926_kaonLT_nacer.pdf

** When we evaluate the functional form of sigm_L for -t value in SIMC, in particular at low -t bins, which are beyond the range of data, we obtain high values of sigm_L leading to bigger discrepency between SIMC and data yields.

** Data/SIMC ratios at low -t bins are improved by limiting the parameter in the exponential of sigm_L.

** sig_LT and sig_TT are set to zero. 

* Alicia

** attachment:uchan-update-sep26.pdf

** Updates on u-channel shape study

** Asymmetry, meson production ratios likely not a feasible measurement 

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h3. September 19, 2025

* Garth's Notes attachment:mtg_25sep19.txt

* Junaid

** Slides: attachment:LTSep_Analysis_19_Sep_2025.pdf

** Iteration v10: attachment:Iteration_v10.pdf

** Changed |t|^power terms in sigmaLT and sigmaTT. Ratios indicate oscillations. Functions need to be changed.

* Nacer

** Slides: attachment:20250919_kaonLT_nacer.pdf

** Data/SIMC are very close to 1, after correction to the separated cross section functional forms, sig_LT and sig_TT are set to zero. 

** Due to sinusoidal behavior in the yields ratio, we will need to include the interference terms in the cross section

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h3. September 12, 2025

* Garth's Notes attachment:mtg_25sep12.txt

* Junaid

** Slides: attachment:LTSep_Analysis_04_Sep_2025.pdf

** Iteration v7: attachment:Iteration_v7.pdf

** Added sigmaLT and sigmaTT terms.

* Kin

** Slides: attachment:update-2025.9.12.pdf

** replayed all 10 settings in Q2=3.0 W=3.14 and Q2=2.1, W=2.95

** small shape difference in missing mass for the proton peak from true pion and misidentified pion.

** modified diamond fit function

** modified \sigmaLT term to avoid negative CS in Left settings, to be optimized.

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h3. September 4, 2025

* Garth's Notes attachment:mtg_25sep04.txt

* Junaid

** Slides: attachment:LTSep_Analysis_Sep_4_2025.pdf

** Added W_factor to functional forms. 

** Set sigma_LT and sigma_TT terms to zero. Getting ratios close to 1.

* Kin

** Slides: attachment:missing-mass-fit-9.4.2025.pdf

** Gaussian fit to Lambda peak, consistent result for all runs in Q^2=3.0, W=3.14

** Subtract background from Sigma peak by modeling it with a "crystalball function":https://www.jlab.org/primex/weekly_meetings/slides_2009_07_17/dmitry/crystalball.html

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h3. August 28, 2025

* Garth's Notes attachment:mtg_25aug28.txt

* Junaid

** Slides: attachment:LTSep_Analysis_Aug_28_2025.pdf

** Getting ratios around 35. 

** Looking into scripts to figure out the issue.

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h3. August 21, 2025

* Garth's Notes attachment:mtg_25aug21.txt

* Junaid

** Slides: attachment:LTSep_Analysis_Aug_21_2025.pdf

** Changed sigma_L functional form from Tanja's to Peter's version.

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h3. August 14, 2025

* Garth's Notes attachment:mtg_25aug14.txt

* Nathan

** Away at doctor's appointment, but there is spirit.

** working on write up for RefTimes study, as well as Lumi study

** Slides with details: attachment:CoinLumiUpdate20250814.pdf

* Nacer

** Due to challenging fit of the separated cross sections, we cancelled the interference terms for now, LT and TT.

** The fits seems converging, but the data/SIMC ratios after couple of iterations although fairly flat, are far from unit.

** Slides: attachment:20250814_kaonLT_nacer.pdf

* Alicia

** Modifying figures for PLB resubmission

** attachment:asym_paper_edits_aug14.pdf

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h3. August 7, 2025

* Tanja's Notes attachment:mtg_25aug07.txt

* Richard

** attachment:KaonLTMeeting8_7_25.pdf

** Tried out a few empirical background fits which improved the results quite a bit. There are few, if any bad bins, with ratios looking pretty flat. Going forward, a 2nd order Chebyshev will be used. With and without pion subtraction was also tested with small differences, but pion subtraction will remain to get a better empirical fit.

* Nacer

** Test the new SIMC weight calculation script during the iterations, by a small variations, +/-5% and +/-10%,  in the separated cross section fits.

** The results are consistent, and small variation in the parameters lead to small variations in the Data/SIMC ratio.

** attachment:20250807_kaonLT_nacer.pdf

* Alicia

** Working on implementing referee comments from PLB

** Looking for perspectives from the group: attachment:asym_paper_edits_aug7.pdf

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h3. July 31, 2025

* Garth's Notes attachment:mtg_25jul31.txt

* Junaid

** Was using the wrong variables to calculate SIMC weights. Fixed weight calculation script.

** Working on iterations using Tanja's functional forms.

** attachment:PionLTMeeting_LTSep5.pdf

* Richard

** attachment:KaonLTMeeting7_31_25.pdf

** Expanded the MM range to clearly show the proton leak through (especially at left/right settings at both epsilons). The HGCer leak through is not as problematic as initially assumed, which is good. Focus will be on fitting this background.

* Nacer

** attachment:20250731_kaonLT_nacer.pdf

** First look at the first iteration and functional forms fit optimization.

* Alicia

** attachment:simc-pythia-july31.pdf

** Pythia+SIMC events compared to data. Good reproduction of background

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h3. July 24, 2025

* Garth's Notes attachment:mtg_25jul24.txt

* Alicia

** attachment:pythia-simc-jul24.pdf

** Successfully ran Pythia events through SIMC, albeit at very low efficiency

* Ivan

** Updated statistical errors on ALU for non-neglible subtractions

** Alicia's derivation: attachment:asym-err-derivation.pdf (Ivan derived the same on paper, posting digital version)

* Junaid

** Ran 01st iteration. Ratios are so high.

** Found an error in the weight calculation script.

** attachment:Q3p85_W2p62_t0p21_iter01.pdf

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h3. July 17, 2025

* Garth's Notes attachment:mtg_25jul17.txt

* Richard

** attachment:KaonLTMeeting7_17_25.pdf

** Using the same functional forms and parameterization as last week showed very nice results when all phi settings were included for Q2=4.4, W=2.74

** There is still some refinement to the functional forms, but overall things are almost ready for this setting.

* Alicia

** Analysis update: progress on both Xphasespace and Pythia approaches to background modelling

** attachment:uchannel_updates_july17.pdf

** Theory update: summary of discussions with Bill at JLab regarding the interpretation of u-channel results

** attachment:uchannel_notes_july17.pdf

* Ivan

** Setting up for systematic studies on K+ BSA

** attachment:KaonLT_Zhenchuk_July17.pdf

* Junaid

** Ran 00th iteration to calculate new params.

** Working on weight calculation script.

** attachment:PionLTMeeting_LTSep4.pdf

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h3. July 10, 2025

* Garth's Notes attachment:mtg_25jul10.txt

* Richard

** attachment:KaonLTMeeting7_10_25.pdf

** The pion subtraction procedure has been refined, leading to a noticeable improvement in the cross-section ratios at Q² = 4.4 GeV² and W = 2.74 GeV (center setting only).

** Tighter MM_K cuts were applied, yielding a modest additional improvement in the ratios.

** Some bins still exhibit contamination. However, incorporating all kinematic settings should mitigate this to some extent. If residual sigma contamination persists, a dedicated sigma fit may be necessary once all settings are fully examined.

* Junaid

** ran 00th iteration to extract new params.

** Working on weight calculation script.

** attachment:PionLTMeeting_LTSep3.pdf

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h3. July 3, 2025

* Garth's Notes attachment:mtg_25jul03.txt

* Richard

** attachment:KaonLTMeeting7_3_25.pdf

** The functional forms last week work fairly well for all Q2 settings (minus 2.115 which needs to be rerun as the cut root files were removed from volatile).

** The pion subtraction has significant improvement on fits and will be the focus over the next week. 

* Junaid

** Started LTSep analysis with Tanja's functional forms

** attachment:PionLTMeeting_LTSep2.pdf

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h3. June 26, 2025

* Garth's Notes attachment:mtg_25jun26.txt

* Richard

** attachment:KaonLTMeeting6_26_25.pdf

** attachment:OldFits_6_25_2025.pdf

** attachment:Cauchy_Schwarz_LT_Proof_v2.pdf

** Resolved a minor bug in the pion subtraction uncertainty calculation and refined the pion scaling factor to enhance subtraction accuracy. Additionally, a new formulation for the unseparated cross section was implemented, based on the Cauchy-Schwarz inequality and constrained by L,T>0.

** Using the updates described above, new models were constructed for Q2=4.4 and W=2.74. Comparisons between data and SIMC show good agreement, with stable ratios and solid cross section fits. While further refinements are needed, this model provides a strong foundation.

* Nacer

** first look at KaonLT, Q2=0.5 GeV2, unseparated and separated cross sections.

** attachment:20250626_kaonLT_nacer.pdf

* Ivan

** Kaon BSA updates: Q2=0.5, W=2.40 and all 10.6 GeV run period data

** attachment:KBSA_Zhenchuk_June26.pdf

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h3. June 20, 2025

* Garth's Notes attachment:mtg_25jun20.txt

* Ivan

** Kaon BSA summary of work to date

** attachment:KaonBSA_Zhenchuk_Jun20.pdf

* Junaid

** Did Rosenbluth fitting on Q2=3.85 Setting

** attachment:PionLTMeeting_LTSep1.pdf

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h3. June 5, 2025

* Garth's Notes attachment:mtg_25jun05.txt

* Richard

** attachment:theta_changes_3p0_2p32.png

** Corrections to the calculation of θ, using the proper Λ mass, yield more reasonable values. However, the LT and TT terms require adjustment to accurately account for these changes. A more pronounced t-dependence is now evident and must be better described.

* Vijay

** Pion and proton absorption studies are completed.

** attachment:Vijay_update_June05_25.pdf

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h3. May 29, 2025

* Garth's Notes attachment:mtg_25may29.txt

* Vijay

** Pion and Proton absorption studies are conducted.

** attachment:Vijay_update_May29_25.pdf

* Junaid

** Plotted ratios vs phi.

** attachment:PionLT_ratios_vs_phi_distribution.pdf

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h3. May 22, 2025

* Garth's Notes attachment:mtg_25may22.txt

* Richard

** attachment:KaonLTMeeting5_22_25.pdf

** Although the Q² = 3.0, W = 3.14 ratio appears promising at first glance, the kinematic and acceptance plots clearly indicate that the older functional form provides a superior fit. Encouragingly, the three key scaling points—Q²/W = 3.0/2.32, 4.4/2.74, and 5.5/3.02—continue to use this form consistently. These will be the main focus in preparation for the upcoming Hall A/C meeting in June.

* Vijay

** working to determine the pion absorption correction factor for the data Yield correction.

** compared some of the variables with the Alicia ones to understand that things are working for me.

** found HGC and AGC peaks are not in my plots. attachment:Vijay_update_May22_25.pdf

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h3. May 15, 2025

* Garth's Notes attachment:mtg_25may15.txt

* Richard

** attachment:KaonLTMeeting5_15_25.pdf

** Q² = 3.0 (W = 2.32) and Q² = 4.4 (W = 2.74) are currently in a relatively stable state. While some refinements remain, their overall condition is solid. 

** A detailed breakdown of all systematic uncertainties, along with estimated timelines, was also reviewed.

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h3. May 8, 2025

* Garth's Notes attachment:mtg_25may08.txt

* Richard

** attachment:KaonLTMeeting5_8_25.pdf

** A dip in the unseparated cross section at 180° was traced to a ROOT issue: while a cut on the NTuple successfully excluded bad data in the TGraph, the TF2 fitting function ignored the cut; this was resolved by applying the cut directly in the Fortran script before loading into ROOT.

** Remaining tasks include reanalysis and re-parameterization at multiple Q2/WQ2/W settings, complete SIMC and replay runs, and finalizing a systematics study in preparation for the upcoming Hall A/C meeting.

* Nacer

** See attached plots for SIMC and data yields  comparison for each setting.

** attachment:center_lowe_kinematics_lambda.pdf

** attachment:left_lowe_kinematics_lambda.pdf

** attachment:center_highe_kinematics_lambda.pdf

** attachment:left_highe_kinematics_lambda.pdf

** attachment:right_highe_kinematics_lambda.pdf

** attachment:center_lowe_kinematics_sigma.pdf

** attachment:left_lowe_kinematics_sigma.pdf

** attachment:center_highe_kinematics_sigma.pdf

** attachment:left_highe_kinematics_sigma.pdf

** attachment:right_highe_kinematics_sigma.pdf

* Junaid

** attachment:PreLTSep_Analysis.pdf

** Calculated physics yields for each phi-bin of each t-bin. Looks good.

** Calculated simc yields for each phi-bin of each t-bin. Looks good.

** Calculated DATA/SIMC yields and made comparisons plots.

** attachment:Q3p85_W2p62_t0p21_loweps_center_Comp_Plots.pdf

** attachment:Q3p85_W2p62_t0p21_higheps_center_Comp_Plots.pdf

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h3. May 1, 2025

* Garth's Notes attachment:mtg_25may01.txt

* Nathan

** presented the current status of the coin RF time cuts for lumi.

** got some strange shapes, plots contained here attachment:CTimeRefPlots_pass1.zip

** going to investigate further

* Richard

** attachment:KaonLTMeeting5_1_25.pdf

** The large interference terms have been attributed to zero or negative unseparated cross-section values observed at angles near 180 degrees.

* Junaid

** Calculated physics yield for "Q2=3.85, W=2.62, t=0.21"

** Need to check the errors.

** attachment:LTSep_Analysis_v4.pdf

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h3. April 24, 2025

* Garth's Notes attachment:mtg_25apr24.txt

* Richard

** attachment:KaonLTMeeting4_24_24.pdf

** Improved ratios at Q² = 3.0 and W = 2.32, with the previously exaggerated TT now under control. Fits are largely acceptable, though interference contributions are still too large.

** For Q² = 3.0, W = 3.14, the ratios are excellent and the kinematic agreement is strong; however, the fit quality is still notably poor.

* Vijay

** Performed the missing mass offset study for the Q2 = 0.42 GeV2 data.

** Still 3 settings at high epsilon have some issues to fix.

** attachment:Vijay_update_April24_25.pdf  

* Alicia

** Replayed 10.6 GeV data for proton mass, helicity enabled

** Preliminary PID / MMp plots:

** attachment:uchannel_updates_apr24.pdf

* Junaid

** Calculated physics yield for "Q2=3.85, W=2.62, t=0.21"

** Need to check the errors.

** attachment:LTSep_Analysis_v4.pdf

* Nathan

** Looking into Coin Reference times to see if there is an effect on the rate dependence.

** Found some strange shapes in the raw coin time distributions: attachment:RefTimesPass0.zip

** checking if calling the "coin time ref cut" file in the replay script changes anything. Looks like it does: attachment:RefTimesPass1.zip

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h3. April 17, 2025

* Garth's Notes attachment:mtg_25apr17.txt

* Richard

** attachment:KaonLTMeeting4_17_24.pdf

** Q² = 3.0, W = 2.32 analysis is progressing well. The t-dependence of the ratios is flat, with minimal structure, consistent with the same functional form used at Q² = 4.4 and 5.5. Some tuning of the W-dependence is still needed to bring the ratios closer to unity. Kinematics and acceptances between data and SIMC are closely matched. However, an unusually large LT/TT cross-section has been observed and warrants further investigation.

* Alicia

** attachment:uchannel_updates_apr17.pdf

** Preliminary look at u-channel data at Q2=3, W=3.14, high epsilon

* Junaid

** Selected t-range from 0.16 to 0.50.

** Divided t-distribution into 5 bins.

** attachment:LTSep_Analysis_v3.pdf

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h3. April 10, 2025

* Garth's Notes attachment:mtg_25apr10.txt

* Richard

** attachment:KaonLTMeeting4_9_24.pdf

** At Q² = 3.0 and W = 2.32, the ratios appear to be converging when using the functional forms derived from Q² = 4.4 and 5.5. Additional iterations are needed to confirm this trend, but the current functional forms seem to perform well across all three Q² settings.

* Vijay

** The all polar plots for the three epsilon data at Q2 = 0.42 GeV^2.

** attachment:Vijay_April10_2025.pdf

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h3. April 3, 2025

* Garth's Notes attachment:mtg_25apr03.txt

* Richard

** attachment:KaonLTMeeting4_3_24.pdf

** The setting Q² = 5.5, W = 3.02 aligns well with the functional form used at Q² = 4.4, W = 2.74. However, statistics are limited at this Q², and the kinematic coverage extends into higher |t| values (tₘₐₓ ≈ 0.9). To improve the statistical reliability, tₘₐₓ will be reduced, which should yield slightly improved ratios in the upper bin. This high-|t| behavior is consistent with observations at Q² = 3.0, W = 2.32 and Q² = 4.4, W = 2.74. Focus will now shift to the Q² = 3.0, W = 2.32 setting.

* Vijay

** Made the polar plot (tcos(phi) vs tsin(phi)) from the higher epsilon settings.

** Draw the circles with the exact same radii as the t bins width. 

** Last circle may be changed later. attachment:tvsphiQp425W2p2.png

* Junaid

** Checked t-ti Resolution.

** Plotted tvsphi distribution to check the full phi coverage. Selected t-range from 0.16 to 0.50.

** Divided t-distribution into 7 bins. Need to do 5 bins. 

** attachment:LTSep_Analysis_v2.pdf

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h3. March 27, 2025

* Garth's Notes attachment:mtg_25mar27.txt

* Vijay

** Made polar plots (tcos(phi) vs t sin(phi)) from the full phi coverage of the epsilon (high epsilon).

** This epsilon has five experimental settings (Righ1, Right2, Center, Left1 and Left2).

** Make this polar plot for each setting and also combine one (adding all five settings).

** These plots have all the requred cuts.    

** attachment:Vijay_Mar27_2025.pdf

* Junaid

** attachment:LTSep_Analysis_v1.pdf

** Calculated Missing Mass offsets and cut (0.90 < MMpi <1.06) for Physics Setting - Q2=3.85, W=2.62, t=0.21 (2 epsilons)

** attachment:Q3p85_W2p62_t0p21_PionProd_MMCut.pdf

** Finalized Diamond cut.

** attachment:Q3p85_W2p62_t0p21_ProdCoin_DiamondCut.pdf

* Nacer

** attachment:20250327_kaonLT_nacer.pdf

** Looked at merged settings for high epsilon data for different -t bins for both lambda and sigma resonances, to verify the coverage in phi.

* Alicia

** attachment:shmsPA_Postuma_Mar27.pdf

** Significant progress on SHMS geant4

** Number of total stopped tracks agrees with spreadsheet, but missed 3/4 triggers does not

** A large number of secondary particles still cause a 3/4 trigger

** Simulation output updated to allow PID on tracks

* Nathan

** showed plots with interesting puzzle. After applying Dave Mack's eLT + CPULT as Gaskel had requested last time (calling this pass14).

** After doing that we lose any consistent trends with any rate that I've investigated. Plots: attachment:LumiPass14.zip

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h3. March 20, 2025

* Garth's Notes attachment:mtg_25mar20.txt

* Richard

** attachment:KaonLTMeeting3_20_24.pdf

** A decent set of functional forms have been selected for Q2=4.4, W=2.74. Before finalizing these, these functional forms will be tested on Q2=5.5/W=2.95 then Q2=3.0/W=2.32. These three share an x=0.4 so thus vital for the scaling studies.

* Vijay

** The diamond cut determined from the low epsilon, Center setting did not work properly for SIMC.

** I studied the diamond cut for low epsilon, left1 and left2 settings and found the same problem (SIMC diamond is not happy with the data diamond).

** I studied the data offsets that need to be applied in SIMC too.

*** I tested this study for low epsilon, Center setting and the SIMC diamond slightly improved.  

** attachment:Vijay_Update_March20_25.pdf

* Nacer

** attachment:20250320_kaonLT_nacer.pdf

** t-binning width in data is compared to the width of delta t (ti-t) in simc.

** t-binning width in data is compared to -t vs. Phi to check the coverage.

* Nathan

** attachment:LumiUpdate2025-03-20.pdf

** presented the mystery of HMS rate dependence in coin lumi data.

** More plots coming later

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h3. March 13, 2025

* Garth's Notes attachment:mtg_25mar13.txt

* Nacer

** attachment:20250313_kaonLT_nacer.pdf

** Study an optimal t-binning for lambda and sigma kaon LT data. 

* Vijay

** Studied the t binning and diamond cuts for the Q2 = 0.42 GeV2 data.

** attachment:Vijay_updates_Mar13_2025.pdf

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h3. March 6, 2025

* Garth's Notes attachment:25mar06.txt

* Richard

** attachment:KaonLTMeeting3_6_24.pdf

** Fixed issue with lowest t-bin for sigT. There was pion contamination that was causing oversubtraction. The tmin was increased, which fixed that issue. 

* Junaid

** attachment:HeeP_Studies_Ratios.pdf

** HeePCoin ratios look good and are close to 1.

** HeeP Ratio plots - attachment:HeeP_Studies_Ratios_Plots.pdf

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h3. February 27, 2025

* Garth's Notes attachment:mtg_25feb27.txt

* Nacer

** attachment:20250227_kaonLT_nacer.pdf

** Diamond cut (W vs Q^2) study for lambda and sigma resonances for each data setting

* Junaid

** attachment:PionLT_Meeting_Update_v3.pdf

** Finalized HeePCoin Offsets.

** Applied global offsets to BE from 5.9GeV-9.9GeV and applied separate offsets to 10.6GeV.

** Plots without offsets- attachment:HeePCoinPlots_nooffset.pdf

** Plots with calculated offsets- attachment:HeePCoinPlots_withoffset.pdf

** Plots with modified offsets- attachment:HeePCoinPlots_withoffsetP0p47.pdf

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h3. February 20, 2025

* Garth's Notes attachment:mtg_25feb20.txt

* Richard

** attachment:KaonLTMeeting2_20_24.pdf

** Comparison of Q2=5.5 and 4.4 with a t-dependent set of functional forms (incorrect sigT causes this). There is nice consistency between the two. Updating to the best set of functional forms is the next step for a comparison across Q2=3.0(W=3.14),4.4, 5.5 for next week.

* Junaid

** attachment:PionLT_Meeting_Update_v2.pdf

** Need to calculate two sets of offsets, one for beam energies 5.9GeV-9.9GeV and other for 10.5GeV.

** Plots without offsets- attachment:HeePCoinPlots_nooffset_v1.pdf

** Plots with calculated offsets- attachment:HeePCoinPlots_withoffset_v1.pdf

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h3. February 13, 2025

* Garth's Notes attachment:mtg_25feb13.txt

* Richard

** attachment:KaonLTMeeting2_13_24.pdf

** Adjusted W dependence for Q2=4.4, W=2.74 for better ratios.

* Junaid

** Calculated OOP offsets. Got +1.875mr for HMS and -0.155mr for SHMS

** attachment:PionLT_Meeting_Update_13_02_25.pdf

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h3. February 6, 2025

* Garth's Notes attachment:mtg_25feb06.txt

* Richard

** attachment:KaonLTMeeting2_6_24.pdf

** Q2=4.4, W=2.74 shows very nice agreement between data and SIMC with simplified functional forms of T and TT. The ratios are stable and fairly flat but seem to settle at R~0.2. The W dependence may need to be adjusted.

* Nacer

** attachment:20250206_kaonLT_nacer.pdf

** Q2=0.5, W=2.4, Central Low epsilon data compared to SIMC for both lambda and sigma missing mass ranges.

* Alicia

** attachment:geant4slides.pdf

** Presentation on the SHMS geant4 progress. Simulation is mostly complete, attempting to verify output

* Junaid

** Updated HMS optics matrix from NPS optics group for 5.9, 6.1 and 6.7 GeV.

** Work in progress for 5.6 GeV.

** Implemented zeroth order CMOP matrix elements for 5.9, 6.1 and 6.7 GeV.

** attachment:HMS_Optics_update_v1.pdf

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h3. January 30, 2025

* Garth's Notes attachment:mtg_25jan30.txt

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h3. January 23, 2025

* Garth's Notes attachment:mtg_25jan23.txt

* Nacer

** First look at data and SIMC yields for kaon LT at 3.8 GeV, Q^2 = 0.5, W = 2.40, Central low E

** SIMC yields are wierdly high 

** attachment:20250123_kaonLT_nacer.pdf

* Nathan

** looking into applying Dave Mack's rate corrections in lumi data https://hallcweb.jlab.org/doc-private/ShowDocument?docid=1063

* Vijay

** Coincidence timing information updates for Q2 = 0.42 GeV2 data.

** attachment:Vijay_Jan23_2025.pdf

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h3. January 16, 2025

* Garth's Notes attachment:mtg_25jan16.txt

* Nathan

** Showed Lumi Singles scaler yields after applying boiling correction

** attachment:CombinedPlotHMS_LH2_Scalar.pdf attachment:CombinedPlotHMS_rate_LH2_Scalar.pdf attachment:CombinedPlotLH2_Singles_Rate_Scalar.pdf attachment:CombinedPlotLH2_Singles_Scalar.pdf attachment:CombinedPlotSHMS_LH2_Scalar.pdf attachment:CombinedPlotSHMS_rate_LH2_Scalar.pdf

** tentative rate correction of 0.029+-0.002 %/MHz obtained

---

h3. January 9,2025

* Garth's Notes attachment:mtg_25jan09.txt

* Nathan

** Presented updated Lumi Singles Scaler Yields for both HMS and SHMS

** https://redmine.jlab.org/attachments/2695 https://redmine.jlab.org/attachments/2696 https://redmine.jlab.org/attachments/2697 https://redmine.jlab.org/attachments/2698 https://redmine.jlab.org/attachments/2699 https://redmine.jlab.org/attachments/2670

** found a boiling correction of (2.8 +- 0.17 (stat) +- 0.69 (sys)) %/100uA

---

h3. January 2, 2025

* Garth's Notes attachment:mtg_25jan02.txt

* Nacer

** attachment:20250102_kaonLT_nacer.pdf

---

h2. 2024 Meetings

---

h3. December 19, 2024

* Garth's Notes attachment:mtg_24dec19.txt

* Nacer

** attachment:20241219_kaonLT_nacer.pdf

* Richard

** attachment:KaonLTMeeting12_19_24.pdf

** Using center data only, nice ratios have been found. There are good chi2 for L,LT but TT, and especially, TT need improvement which is evident from ratios.

---

h3. December 12, 2024

* Richard's Meeting Notes attachment:mtg_12dec24.txt

* Richard

** attachment:KaonLTMeeting12_12_24.pdf

** t-range: Adjusted from 0.15-0.6 to 0.16-0.6.

** Binning Scheme: Changed to 5 bins in t and 10 bins in phi. Increased the number of events per bin.

*** Outcome: Significant reduction in pion leakage for the lowest t-bin.

** Upper t-range: Need to reduced from 0.6 to 0.5 to address high-background issues in the highest t-bin.

* Nacer

** attachment:20241212_kaonLT_nacer.pdf

---

h3. December 5, 2024

* Garth's Notes attachment:mtg_24dec05.txt

* Richard

** attachment:KaonLTMeeting12_5_24.pdf

** A MM shift to the lambda peak was implemented. 

** It was found that in the lowest t-bin (<0.2) there is a significant pion background. This greatly lowers the statistics in this bin. 

---

h3. November 21, 2024

* Garth's Notes attachment:mtg_24nov21.txt

* Richard

** attachment:KaonLTMeeting11_21_24.pdf

** The MM peaks for high and low epsilon show a shift by ~10 MeV. The shift is different for high and low but consistent for all Q2 except Q2=3.0, W=2.32. The beam energy will be checked first and if things look fine then an offset will be applied on a run by run basis (plus for SIMC).

* Nacer

** HeeP singles data/simc ratios deviate from 1.

** the W distribution left and right tales are not produced in SIMC, and vary for each beam energy settings.

** attachment:20241121_kaonLT_nacer.pdf

---

h3. November 14, 2024

* Garth's Notes attachment:mtg_24nov14.txt

* Nathan

** showed plots of lumi status. More work needs to be done

** attachment:CombinedPlotCarbon.pdf attachment:CombinedPlotCoin.pdf attachment:CombinedPlotHMS_LH2.pdf attachment:CombinedPlotHMS_LH2.pdf attachment:CombinedPlotLH2_ALL.pdf attachment:CombinedPlotLH2_Singles.pdf attachment:CombinedPlotSHMS_LH2.pdf

---

h3. November 7, 2024

* Dave's Notes attachment:mtg_24nov07.txt

---

h3. October 31, 2024

* Garth's Notes attachment:mtg_24oct31.txt

* Junaid

** Working on SHMS PID study for pions attachment:SHMS_PID_Studies_v3.pdf

** Did study on "EBeam=7.937, Q2=3.85, W=3.07, x=0.31, θ_SHMS=5.50 (Right)" & attachment:SHMS_PID_plots_v3.pdf

---

h3. October 24, 2024

* Garth's Notes attachment:mtg_24oct24.txt

* Nacer

*** final results for both HMS and SHMS HeeP singles for 3.8 GeV beam energy. attachment:20241024_kaonLT_nacer.pdf

* Junaid

** Working on SHMS PID study for pions attachment:SHMS_PID_Studies_v2.pdf

** Did study on "EBeam=8.479, Q2=2.12, W=2.05, x=0.38, θ_SHMS=21.22 (Center)" & attachment:SHMS_PID_plots_v2.pdf

---

h3. October 17, 2024

* Garth's Notes attachment:mtg_24oct17.txt attachment:MJones-HCANA-DC-update.pdf

* Richard

** attachment:KaonLTMeeting10_17_24.pdf

** Breakdown of different sigTT for Q2=3.0, W=3.14. It is determined that using Marco's thesis form of sigTT will be the best generally.

* Nacer

** attachment:20241017_kaonLT_nacer.pdf

** HeeP coin ratios are good, still waiting for proton absorption from Geant.

** Heep singles HMS are consistent with 1, still checking SHMS

* Junaid

** Working on SHMS PID study for pions attachment:SHMS_PID_Studies_v1.pdf

** Did study on "EBeam=5.986, Q2=3.85, W=2.02, x=0.55, θ_SHMS=15.79 (Center)" attachment:SHMS_PID_plots_v1.pdf

---

h3. October 10, 2024

* Garth's Notes attachment:mtg_24oct10.txt

* Richard

** attachment:KaonLTMeeting10_10_24.pdf

** Ratios and xsects for all Q2 settings with adjusted W factor. Overall things look pretty good (Q2=5.5 still needs some investigation) with ratios fairly flat around unity for all settings and xsects looking promising.

* Vijay

** The HMS delta systematic uncertainty study has been completed using the unseparated cross-section.

** The volume systematic uncertainty for the Q2=0.38 GeV2 analysis has been determined by taking the quadrature sum of all contributing variables.

** In summary, the volume systematic uncertainty is 1.3% - 6.5%. attachment:Vijay_Oct10_2024.pdf  

* Nathan

** presented status of PionLT Coin Lumi analysis.

** Some cuts need to be modified and random subtraction needs to be done

** attachment:PionLTCoinLumi_Pass1.pdf

* Junaid

** Implemented Mark's SHMS 3/4 Hodosocpe efficiency updates to HCANA and param files.

** Getting Efficiencies > 99% attachment:Hodo_3_of_4_Effciency_Study.pdf

---

h3. October 3, 2024

* Garth's Notes attachment:mtg_24oct03.txt

* Richard

** attachment:KaonLTMeeting10_3_24.pdf

** Finally resolved issue with ratios sitting between 0.2-0.6 by adjusting the W term.

* Vijay

** Working to complete the volume systematic uncertainty study. The only HMS delta systematic uncertainty is in progress.

** attachment:Vijay_Oct3_2024.pdf

---

h3. September 26, 2024

* Garth's Notes attachment:mtg_24sep26.txt

* Alicia

** Responding to referee comments: computing pion PID efficiency and purity

** Discovered small amount of proton leakthrough -> added lower cut MMpi>0.91

** attachment:BSA_Postuma_Sep26.pdf

* Junaid

** looked at SHMS beta distribution attachment:HeeP_Studies_study_v9.pdf

** No need to use HMS beta cut.

---

h3. September 18, 2024

* Garth's Notes attachment:mtg_24sep19.txt

* Richard

** attachment:KaonLTMeeting9_18_24.pdf

** Running Vijay's pion Q2=0.38 setting worked nicely using the kaon scripts but there is an issue with the MM location that needs to be sorted out.

* Junaid

** Calculated ratios using 3/4HodoEFF>99% attachment:HeeP_Studies_study_v8.pdf

---

h3. September 12, 2024

* Garth's Notes attachment:mtg_24sep12.txt

* Nacer

** attachment:20240912_kaonLT_nacer.pdf

* Ali

** Updated Missing Mass shape study plots

** attachment:KaonLT_Meeting_Sept_12_2024.pdf

* Junaid

** Calculated ratios using missing mass cut attachment:HeeP_Studies_study_v7.pdf

---

h3. September 5, 2024

* Garth's Notes attachment:mtg_24sep05.txt

* Richard

** attachment:KaonLTMeeting9_5_24.pdf

** The ratios seem to still be settling at values between 0.3-0.6 for all Q2. I outline some ideas for debugging this issue.

* Junaid

** Update on SHMS 3/4 Hodosscope efficiency attachment:Hodo_3_of_4_Effciency_Study_v2.pdf

** Need to use ptof_tolerance = 2 in param files.

---

h3. August 29, 2024

* Garth's Notes attachment:mtg_24aug29.txt

* Nacer

** attachment:20240829_kaonLT_nacer.pdf

** HeeP data/simc ratio improvements after missing mass cut MMp<0.11 GeV/c^2.

* Nathan and Zach

** Zach's last meeting

** presented final set of plots using CPULT + estimated ELT where EDTM was strange for 2022 Lumi data.

** found that CPULT was not working properly in HMS only runs, but was fine in SHMS data.

** Plots: attachment:Yield_2022_HMS_C_Final_EDTM.pdf attachment:Yield_2022_HMS_C_Final_ELT.pdf attachment:Yield_2022_HMS_LH2_Final_EDTM.pdf attachment:Yield_2022_HMS_LH2_Final_ELT.pdf attachment:Yield_2022_SHMS_C.pdf attachment:Yield_2022_SHMS_C_Final.pdf attachment:Yield_2022_SHMS_LH2_before.pdf attachment:Yield_2022_SHMS_LH2_Final.pdf

* Junaid

** looked at SHMS 3/4 Hodoscope efficiency attachment:Hodo_3_of_4_Effciency_Study_v1.pdf

---

h3. August 22, 2024

* Garth's Notes attachment:mtg_24aug22.txt

* Junaid

** Calculated HeeP ratio after fixing raster parameters attachment:HeeP_Studies_study_v6.pdf

** Peaks are sharp now attachment:New_raster_plots1.pdf

** Ratios are high. Need to check HMS and SHMS Hodoscope 3/4 efficiencies  

---

h3. August 15, 2024

* Dave/Alicia's Notes attachment:mtg_24aug15.txt

* Richard

** attachment:heep_ratio.pdf attachment:FullAnalysis_3p8_Offset.pdf attachment:FullAnalysis_4p9_Offset.pdf attachment:FullAnalysis_6p2_Offset.pdf attachment:FullAnalysis_8p2_Offset.pdf attachment:FullAnalysis_10p6_Offset.pdf

** HeeP ratios are consistent with my previous results (slight changes from improvements to HMS cherenkov/calorimeter efficiency). There are some inconsistencies between Nacer and me, specifically with the SHMS Hodo efficiencies. My replays were from Dec. 2023, so I want to rerun all replays to double-check consistency between my results.

** Q=4.4/W=2.74 results were included in the KaonLT global comparison from last week. Q2=3.0/W=2.32 were running and slides will be posted when these are finished up to get the KaonLT global comparison for all Q2 (minus Q2=0.5).

* Nacer

** Heep data/simc study continue

** SHMS 3/4 Hodo and EDTM live time different from Richard's results for the same beam energies.

** More details attachment:20240815_kaonLT_nacer.pdf

* Junaid

** Checked raster parameters attachment:HeeP_Studies_study_v5.pdf

** Flipped raster y parameters sign and tilt decreased attachment:E10p549_HeePCoin_RasterCheck_Uncut_Distributions.pdf

---

h3. August 7, 2024

* Garth's Notes attachment:mtg_24aug07.txt

* Richard

** attachment:KaonLTMeeting8_7_24.pdf

** Q2=2.115, 3.0 (W=3.14), 5.5 were plotted vs -t (scaled to W=3.0) as well as vs Q2 (for fixed t). There is nice consistency between settings for L/LT/TT, but T has an odd shape that needs to be investigated.

** This study will be expanded to include all Q2 settings which should fill out the comparison and narrow down a proper T description. 

* Nacer

** attachment:20240807_kaonLT_nacer.pdf

** HeeP data/simc ratio is in order of 1.6% and 4% for 3.8 GeV and 4.8 GeV data respectively. Unfortunately, it the discrepancy is higher for 6.2, 8.2 and 10.6 GeV, which needs more investigation.

* Vijay

** Changed the SigLT and SigTT functional forms to improve the yield ratio plots.

** The new forms are: SigLT = p1*exp(p2*t) + p3/t, SigTT = p1*exp(p2*t) + p3/t.

** The updated ratio plots are attached. 

** attachment:375_781.png, attachment:375_629.png, attachment:375_286.png 

** I'll catch up on the analysis after my final thesis defense, and then submit the final version to the FGSR office!

* Junaid

** Fixed error calculation and getting reasonable values attachment:HeeP_Studies_study_v4.pdf

** Checked raster parameters attachment:E6p395s1_HeePCoin_RasterCheck_Uncut_Distributions.pdf

** Need to check signs

---

h3. July 31, 2024

* Garth's Notes attachment:mtg_24jul31.txt

* Richard

** attachment:KaonLTMeeting7_31_24.pdf

** Using old log entries from Fpi, I have fit the Q2/W/theta dependence per t-bin.

* Vijay

** The systematic uncertainties in the separated cross-sections due to SHMS and HMS volumes have been determined.

** The effect of varying individual acceptance cuts (delta, xptar, yptar) by ±10% at a time on the separated cross-sections has been analyzed.

** The net effect on the separated cross-sections was determined by summing the uncertainties in quadrature for all six cuts (delta, xptar, yptar, each has two cuts).

** For SHMS

*** SigL: Varies between 0.1% and 0.8%    

*** SigT: Varies between 0.1% and 1.2%

** For HMS:

*** SigL:Varies between 19% and 28%    

*** SigT:Varies between 14% and 19%

** Detailed spreadsheets outlining the uncertainties for both spectrometers are attached.

*** attachment:Q1SHMSAcceptanceStudy_July31_24.ods

*** attachment:Q1HMSAcceptanceStudy_July31_24.ods

* Junaid

** Checked error calculation and needs to be fixed attachment:HeeP_Studies_study_v3.pdf

** Need to check raster parameters.

---

h3. July 25, 2024

* Dave's Notes attachment:mtg_24jul25.txt

* Richard

** attachment:KaonLTMeeting7_25_24.pdf

** Q2=2.115 is in line with the other Q2s now. There are still some t-dep and Q2-dep that needs to be figure out to improve ratios.

* Junaid

** Calculated HeeP Ratios attachment:HeeP_Studies_study_v2.pdf

** Errors are big. Need to recheck the error calculation on the ratios.

---

h3. July 18, 2024

* Garth's Notes attachment:mtg_24jul18.txt

* Richard

** attachment:KaonLTMeeting7_16_24.pdf

** New functional form used based off fpi. The transverse term likely needs a |-t| dependence as seen by the ratios.

---

h3. July 11, 2024

* Garth's Notes attachment:mtg_24jul11.txt

* Nathan and Zach

** presented update on the Lumi analysis. attachment:PionLTmeetingjuly112024.pdf

** good news, Carbon is flat. Medium news, funny outliers in the carbon.

* Richard

** attachment:KaonLTMeeting7_11_24.pdf

** Comparison of xsects for Q2=2.115,3.0,5.5 shows a fairly constistent trend across -t, but the ratios are still not satisfactory and a new functional form is likely required.

* Vijay

** The effect of SHMS acceptance variation (±10% of the nominal values of delta, xptar, and yptar) on the separated cross-section is studied.

** attachment:Q1SHMSAcceptanceStudy.ods

* Junaid

** Calculated HeeP Ratios attachment:HeeP_Studies_study_v1.pdf

---

h3. June 27, 2024

* Garth's Notes attachment:mtg_24jun27.txt

* Richard

** attachment:KaonLTMeeting6_27_24.pdf

** Finding the correct parameterization for Q2=5.5 is still being investigated. A breakdown of the plots and issues in finding a correct one is shown.

* Vijay 

** Added LT and TT in the systematic uncertainty studies.

*** The systematic uncertainties due to the scanning of missing mass cuts and the effects of the radiative tail have been evaluated for the Q² = 0.38 GeV² data.

*** I calculated the RMS of the variation in SigL and SigT for all eight cuts that were scanned, and also compared them with the standard cut. attachment:Q1MMpiCutStudy_June27_24.ods

*** I turned off the radiative tail flag in the SIMC input files for all the kinematics of the Q² = 0.38 GeV² data, and then compared the SigL and SigT values. attachment:Q1RadiativeStudy_June27_24.ods

* Junaid

** Finalized HeeP Offsets signs 

** OOP offsets with existing signs are doing good job attachment:HeeP_Studies_offsetsigns.pdf

---

h3. June 19, 2024

* Garth's Notes attachment:mtg_24jun19.txt

* Vijay

** The systematic uncertainties due to the scanning of missing mass cuts and the effects of the radiative tail have been evaluated for the Q² = 0.38 GeV² data.

** I calculated the RMS of the variation in SigL and SigT for all eight cuts that were scanned, and also compared them with the standard cut. attachment:Q1MMpiCutStudy.ods

** I turned off the radiative tail flag in the SIMC input files for all the kinematics of the Q² = 0.38 GeV² data, and then compared the SigL and SigT values. attachment:Q1RadiativeStudy.ods

* Junaid

** Finalized In-plane HeePCoin offsets study.

** Need to implement In-Plane (momentum, energy and angle) offsets with positive sign.

attachment:PionLT_HeeP_Studies_in_plane_offset_Final.pdf

attachment:PionLT_HeeP_Studies_in_plane_offset_plots_Final.pdf

---

h3. June 13, 2024

* Garth's Notes attachment:mtg_24jun13.txt

* Richard

** attachment:KaonLTMeeting6_13_24.pdf

** 0th iteration for Q2=5.5,W=3.02 were shown. The t-range and binning needs to be adjusted, but this Q2 setting is behaving better than 2.115.

---

h3. June 6, 2024

* Garth's Notes attachment:mtg_24jun06.txt

* Junaid

** Finished HMS Cer and Cal efficiency studies.

** Got 0.9981 for HMS Cer and 0.9981 for HMS Cal.

** attachment:PionLT_HMS_Detector_efficiencies.pdf

** Working on HeeP In-Plane Offsets. Did the first comparison.

** Momentum offsets should be applied in 1% unit.

** attachment:PionLT_HeeP_Studies_v1.pdf

** attachment:HeePCoin_Offset_Study_withoffset_v1.pdf

* Richard

** attachment:KaonLTMeeting6_6_24.pdf

** Function form for sigL and sigT were changed. Only small changes seen in sep xsect (only 1 iteration)

** "Globus file sharing information":https://redmine.jlab.org/projects/kltexp/wiki/Globus_File_Sharing

** Ali, Vijay, and I discussed systematics. We will concentrate on pt-to-pt first.

* Vijay

** Pion missing mass scanned for the cut dependence study.

** attachment:Vijay_update_June6_2024.pdf

* Nacer

** Heep coin study for 3.8 GeV and 4.9 GeV.

** attachment:20240606_kaonLT_nacer.pdf

* Ali

** Missing Mass Shape Study for pi-Delta BSA analysis is complete for all kinematics

** attachment:KaonLT_Meeting_June_6_2024.pdf

---

h3. May 23, 2024

* Garth's Notes attachment:mtg_24may23.txt

* Richard

** attachment:KaonLTMeeting5_23_24.pdf

** Iterating on Q2=2.115,W=2.95; still in progress. Kinematic Q2/W vs t plots were fit for both Q2=2.115/W=2.95 and Q2=3.0/W=3.14 to get an idea of their dependence for implimentation on functional forms of xsects.

* Junaid

** Updated beam energy values from Mark's wiki page.

** Got updated Heepcoin In-plane offsets.

** attachment:HeeP_Studies_inplane_offset.pdf

* Nathan

** Checked up on BCM calibration Quadratic correction in BCM2

*** All data with fit parameters from low current fits, no Quadratic term: attachment:refit_bcm2_2021a_noQuad.png, attachment:refit_bcm2_2022_noQuad.png

*** All data with fit parameters from low current fits, with Quadratic term: attachment:refit_bcm2_2021a_Quad.png, attachment:refit_bcm2_2022_Quad.png

*** All data, refit leaving quadratic terms fixed and allowing linear terms to move: attachment:refit_bcm2_2021a_Quad_fit.png, attachment:refit_bcm2_2022_Quad_fit.png

** Nathan's opinion is to use old terms for 2022, and the new terms for 2021

** New lumi scan plots: attachment:Yield_6-4HMS_C.pdf attachment:Yield_6-4SHMS_C.pdf attachment:Yield_9-2pt1_C.pdf attachment:Yield_9-2pt2_C.pdf

---

h3. May 16, 2024

* Garth's Notes attachment:mtg_24may16.txt

* Junaid

** Updated beam energy values from Mark’s wiki page in standard.kinematics.

** Updated the report template files for BCM2 current values.

** Re-calculated the errors for out-of-plane offset. Added systematic error to error calculation.

** Finalized Out-of-Plane Offset got +1.90mr for HMS and -0.07mr for SHMS.

** attachment:PionLT_HeeP_Studies_Out_of_plane_offset.pdf

* Nathan

** posted updated Lumi scan plots:

** attachment:Yield_6-4HMS_C.pdf attachment:Yield_6-4SHMS_C.pdf attachment:Yield_9-2pt1_C.pdf attachment:Yield_9-2pt2_C.pdf

---

h3. May 09, 2024

* Garth's Notes attachment:mtg_24may09.txt

* Vijay

** Cross-section plots for Q^2 = 0.38 GeV^2 data that I made for my thesis. attachment:Vijay_update_May9_2024.pdf

* Richard

** Unseparated and separated cross sections for Q^2 = 3 GeV^2 and W=3.14 GeV. attachment:KaonLT-update-05092024.pdf

* Ali

** Update on pi-Delta BSA analysis. Finished shape study for Q2 = 5.5 and 4.4. Extracted asymmetry for both settings and it's looking very good.

** attachment:KaonLT_Meeting_May_9_2024.pdf

---

h3. May 02, 2024

* Garth's Notes attachment:mtg_24may02.txt

* Richard

** attachment:KaonLTMeeting5_2_24.pdf

** 17 iteration results for Q2=3.0, W=3.14. Parameterization was done with only center data in a t-range of 0.1 to 0.3. Iterations were fit with a 1D fit (removing Q2 dependence).

* Vijay

** LT sep analysis update. attachment:Vijay_May2_2024.pdf

---

h3. April 25, 2024

* Garth's Notes attachment:mtg_24apr25.txt

* Vijay

** Obtained all preliminary four separated cross-section terms at Q2=0.38 GeV2.

** Yield ratio (exp/simc) plots for all three epsilon values are included. 

** Acceptance and kinematics plots (thesis plots) from the center setting at epsilon=0.629 are also provided. attachment:Vijay_Apr25_2024.pdf

** Next Plan for 3-4 Weeks:

*** I have a tight deadline from our FGSR office to complete my thesis.

---

h3. April 18, 2024

* Garth's Notes attachment:mtg_24apr18.txt

* Richard

** attachment:KaonLTMeeting4_18_24.pdf

** I am confident that the output of recon_hcana and data match fairly well and that iterations are the next step to optimize this.

---

h3. April 11, 2024

* Garth's Notes attachment:mtg_24apr11.txt

* Richard

** attachment:KaonLTMeeting4_11_24.pdf

** Mismatch between xptar for data/simc has been resolved by removing RF cut. Offset in t-distribution for data/simc has been resolved by fixing an error in recon_hcana (wrong mass used in detected particle calculation). Fixes to iterations, ongoing.

* Vijay

** Extracted preliminary Sig_L and Sig_T cross-sections

** Working to improve the extracted cross-sections. attachment:Vijay_April_11_2024.pdf

* Nacer

** Final cuts optimized for kaon events selection, detail attachment:20240411_kaonLT_nacer.pdf

---

h3. April 4, 2024

* Garth's Notes attachment:mtg_24apr04.txt

* Nathan

** Update on Lumi, working on set of Lumi data that has BCM calibrated

** Found that we'll need zero current offset and that there were offsets already applied: attachment:lumiUpdate2024-04-04.pdf

*** Full set of plots: attachment:Yield_9-2pt1Carbon.pdf attachment:Yield_9-2pt1Carbon.pdf

* Ali

** Update on pi-Delta BSA analysis. Plots include missing shape study and asymmetry for Q2 = 3.0, W = 3.14 (low t).

** attachment:KaonLT_Meeting_Apr_4_2024.pdf

* Alicia

** Finalizing asymmetry results after error meeting

** attachment:AsymmetryErrors2.pdf

---

h3. April 2, 2024

* Special meeting to discuss BSA uncertainties

* Garth's Notes attachment:bsa_24apr02.txt

* Alicia's slides attachment:Asym_errors.pdf

---

h3. March 28, 2024

* Garth's Notes attachment:mtg_24mar28.txt

* Richard

** attachment:KaonLTMeeting3_28_24.pdf

** SHMS xptar had an odd distribution. Upon further inspection, the RF cut was the cause. There is a correlation between xptar and the RF which must have a path length correction. For KaonLT data (>Q2=0.5), the RF will no longer be used.

* Nacer

** The RF time cut is the most efficient event selection among PID cuts, particularly to select kaons (lambda peak) and suppress pions (neutron peak) for 3.8 GeV and 4.9 GeV kaon LT data, see attachment:20240328_kaonLT_event_selection_nacer.pdf

* Alicia

** Updated asymmetry plots: attachment:Asym_Postuma_Mar28.pdf

* Junaid

** Made HeePCoin plots for offset studies.

** attachment:HeePCoin_Offset_Study.pdf

---

h3. March 21, 2024

* Garth's Notes attachment:mtg_24mar21.txt

* Nathan

** Got lumi script running. Initial plots of lumi: attachment:Yield_9-2C.pdf

** Still need to do alot of bug fixing

* Ali

** Update on pi-delta BSA analysis.

** A comparison b/w SIDIS and RHO is done to see which one fits the data better. SIDIS wins the race since RHO results in a bad fit.

** Will be able to do 2 t-bins for higher statistic data (Q2 = 3.0, W = 3.14)

** attachment:KaonLT_Meeting_Mar_21_2024.pdf

* Alicia

** Implemented delta correction in hcana: attachment:Asym_Postuma_Mar21.pdf

---

h3. March 14, 2024

* Garth's Notes attachment:mtg_24mar14.txt

* Vijay

** Good news, got all yield ratio plots correct.

** Got an Unseparated cross-section.

** Got a Separated cross-section.

** Excited to have the first LT sep plots today. attachment:Vijay_update_Mar14_24.pdf

* Alicia

** Missing mass cut values for asymmetry: MMpi<1.01+/-0.02

** Determined reasonable delta correction

** Trying to compile hcana to implement delta correction there

** attachment:Asym_Mar14.pdf

* Ali

** Preliminary plot for pi-Delta MM shape study (Q2 = 3.0, W = 3.14 center). This includes all the MC with new resolution factor.

** attachment:Q3p0W3p14center_pos.pdf

* Junaid

** Updated ltsep package for PionLT

** Added ngcer variables to ltsep package.

** Updated RF offset for HeePCoin PionLT data

** Updated HeeP Coin scripts.

** Finalized HeePCoin PID cuts.

** attachment:HeePCoin_PID_Study.pdf

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h3. March 7, 2024

* Garth's Notes attachment:mtg_24mar07.txt

* Nathan

** Made Quick PID efficiency plots for SHMS NIM paper. Found HGC zero bin entries still an issue. "NIMpaperPidPlots.pdf":https://redmine.jlab.org/attachments/2394 

** Without zero bin cut: "SHMS_Pion_PIDeffPlots_16504.pdf":https://redmine.jlab.org/attachments/2395 with zero cut: "SHMS_Pion_PIDeffPlots_16504_v2.pdf":https://redmine.jlab.org/attachments/2396

** Lumi without zero bin cut: "SHMS_Electron_PIDeffPlots_16759.pdf":https://redmine.jlab.org/attachments/2397

* Richard

** attachment:KaonLTMeeting3_7_24.pdf

** Fixed issue with shrinking xsect on each iteration. The issue was a mistake in absolute error being mistaken for relative error when calculating xsect error.\

** Pion subtraction implemented with not much change in xsect beyond lowest t-bins. Smaller t-bins see a 50% reduction with MM cut

** Iteration script works, now just trying to find best parameterization. Particularly for Q2=3.0, W=2.32 where eps_low>eps_hi

* Ali

** SIMC resolution study is complete. The final resolution factor for SHMS DC is 3.5.

** Good agreement between data and MC in each t-bin. Higher Q2 data has better agreement.

** Also checked target quantities with and without resolution tunning. No issues in reconstruction with resultion tunning.