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Kaon LT Meetings » mtg_24mar21.txt

Garth Huber, 03/21/2024 06:48 PM

 
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                 Mar 21/24 PionLT/KaonLT Analysis Meeting Notes
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                 ----------------------------------------------
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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, Nacer Hamdi, Ali Usman, Alicia Postuma, Muhammad Junaid,
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   Nathan Heinrich, Vijay Kumar
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JLab - Dave Gaskell
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FIU - Pete Markowitz
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CSULA - Konrad Aniol
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CUA - Casey Morean, Tanja Horn
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Nathan
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------
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PionLT luminosity scan analysis
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- worked on getting Richard's Lumi script working
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  - shows initial result of first lumi scan in 2021 (Carbon runs 12144-12151)
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  - these runs have a BCM calib from Dave Mack
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  - only 4 of 9 points shown, some plotting bug to fix
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  - SHMS Rate up to 200 kHz, current up to 70uA
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  - the 4 points so far look reasonable, but more work to be done
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- Dave: what is "Relative Yield Scaler"?
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  - probably is ELREAL scaler, but need to check
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- will work on single arm Lumi scan after the script is better understood
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  - that scan will require a BCM calibration, will check with Dave Mack
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Junaid
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------
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PionLT Heep analysis
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- no plots to show this week
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- ran SIMC for all HeepCOIN settings, will do fits for GH offset studies
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Garth
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-----
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Modifications to SIMC for pion scattering in SHMS collimator
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- located Fpi-2 HMS collimator routine for implementing in SIMC
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- Dave: SHMS collimator is 2.5 inches thick
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- Stephen: docDB report on SHMS collimator:
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  https://hallcweb.jlab.org/doc-private/ShowDocument?docid=1104
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Ali
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---
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piDelta BSA
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- starting on 3 highest Q2, where no HMS delta-correction is needed
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- MM shape study
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  - SIDIS and RHO dists so similar, so will just use SIDIS
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  - shows example fit using either just SIDIS or just RHO
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    - SIDIS fits are a bit better than RHO
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  - plots of fitting still in progress
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  - running SIDIS MC for more statistics
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- Q2=3.0, W=3.14 t-binning
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  - this setting has enough statistics for 2 t-bins
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  - can't use just SHMS center setting to determine binning, need to use L,R,C
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    to get stats over full t-distribution
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  - places a tight cut on piDelta MM region to get approximate statistics for
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    binning without doing a background subtraction
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  - will divide the t-dist at -t=0.425 for the 2 tins
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- Ideas on Systmatic Error estimate for Delta fitting
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  - Option 1: compare BSA using integration of Delta MC fit to data, to BSA
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    determined from (Data-SIDIS-pi+n fits)
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  - Option 2: compare BSA when varying the pi+n and SIDIS fits
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    - fit pi+ at peak, or at just the tail (an extreme case)
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  - Tanja: exactly what systematic are you trying to determine here?
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    - GH: expecting the uncertainty from the Delta fitting to dominate over the
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      MM cut dependence, since the Delta peak is not clean (unlike pi+n) it is
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      not so obvious that we can disentangle the Delta fitting systematic from
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      the MM integration region systematic
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  - Dave: when fitting pi+n MC, do you fit to the height of the peak, or the
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    integral within some MM region to be less sensitive?
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    - Ali: fits just to the pi+n peak
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    - Dave: try to fit integral within some FWHM (or other region) and get the
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      integrals to agree instead
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  - Tanja: trying a variety of different methods to understand how various
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    effects may be correlated seems the best approach
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Alicia
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------
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HMS delta-correction in hcana
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- hcana compilation issues
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  - eventually got it to work after info from Stephen, Ole
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- editing SpectrometerClass
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  - found that Tanja's old Q3 correction (fSatCorr) is already implemented in
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    code
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  - kept that architecture, but added two new options for P_HMS=5.3, 6.5
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- MM vs hsxpfp plots shown for:
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  - P=6.59, Run 4873
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    - if hsxpfp>0, hsdelta+=3.0 hsxpfp  -- LOOKS GOOD
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  - P=5.29
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    - if hsxpfp<0, hsdelta-=5.0 hsxpfp  -- OVERCORRECTS, 4.0 looks better
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- running batch jobs for replaying these data
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  - have "nearly final" BSA values for other three Q2 settings
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Dedicated meeting to discuss BSA errors, for April 1 or 2
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- please fill out poll at:
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  https://www.when2meet.com/?24252350-iFG7B
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Vijay
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-----
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Low Q2 PionLT analysis
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- no plots to show this week
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- working on Data/MC ratio plots with only Central SHMS setting
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  - encountered unexpected errors, still debugging
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  - last week's plots with all SHMS settings are available on RedMine
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- in addition, trying to understand MC iteration process
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Nacer
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-----
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Low Q2 KaonLT PID studies
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- no plots to show this week
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- trying to get a good RF cut, other PID cuts are mostly ready
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  - will try to reduce pi+n peak w/o cutting into Lambda/Sigma events
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  - GH: once you decide on an RF cut, you will want to go back and recheck the
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    other PID cuts as it will be a bit easier to distinguish small K+ from big
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    pi+ sample
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  - Nacer: if RF cut works really well, maybe won't need HGC cut, which would
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    simplify other parts of analysis
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Stephen
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-------
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SHMS NIM paper
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- thanks to everyone for submitting plots for NIM paper
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- has all of the needed plots now, will try to implement them soon
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- will aim to have paper ready for submission to NIM by end of April
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N*2024 Conference at York, June 14-21
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- asked to give a 20 minute talk on meson form factors
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  - will ask for update plots for the presentation
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- will distribute an abstract soon
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Next Meeting
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------------
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- Thur Mar 28 @ 15:00 Eastern/13:00 Regina
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  - KaonLT will go first
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