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