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Sep 4/25 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, Alicia Postuma, Muhammad Junaid, Nathan Heinrich,
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Nermin Sadoun, Nacer Hamdi
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CSULA - Konrad Aniol
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FIU - Pete Markowitz
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CUA - Sameer Jain, Chi Kin Tam, Tanja Horn, BC Manoj
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JLab - Dave Gaskell
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Ohio - Julie Roche
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Junaid
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PionLT Q2=3.85 LT-separations
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- last week, showed that Data/MC ratios went from 6->30 when doing first
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iteration, something clearly wrong
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- checked the yield calcs for Data & MC, and they were consistent with the
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increasing ratio. The data yield was constant while the MC yield dropped
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- rechecked scripts, cuts, yield and average kinematic calculations
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- found the error: Wfactor was missing in the functional form fit to sig_L,T
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- with the Wfactor included, Data/MC ratios went from 6->1 when doing first
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iteration. Great news!
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- doing a 2nd iteration gave ratios slightly closer to 1
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- Data/MC ratios show a phi-dependence that grows with -t, clearly need to
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add LT,TT terms to fit
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- the Data/MC ratios show a slightly worse t-dependence at low epsilon than
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high epsilon, clearly the t-dependence in sigT is not correct
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- sigT in fact right now has NO t-dependence in its function, only
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Q2-dependence
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- next steps: try iterations with LT,TT
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- after that, add some t-dependence to sigT
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Nacer
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-----
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KaonLT Q2=0.50 LT-separations
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- moving from Fpi-2 pi+ functional form to sig_factorized form
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- GH helped with Fortran code today
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- still making code checks
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- will incorporate missing Wfactor discovered by Junaid
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Alicia
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------
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pi+n BSA PLB changes
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- GH got CLAS12 Q2,xB standard deviations from Stefan Diehl
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- shows new version of Fig 4, it's deemed acceptable
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- GH will add to the paper, including an expanded figure caption
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- Alicia is making various changes to text based on referee comments, GH will
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review before relasing to rest of group
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- GH received VR model from B-G Yu, they reconstructed the model from what was
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in the VR paper and did some code checks to see it reproduced their
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calculations
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- Alicia will calculate VR BSA for the actual experiment kinematics using
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this code
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- radiative correction sensitivity checks requested by referee
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- added sigLT'=0.1*sig0 to SIMC model
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- generating beam helicity randomly and output to tree
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- still checking code
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- Dave suggests to plot sigCM vs phi for each helicity state to see if you
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are getting the desired phi-modulation
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Nathan
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------
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PionLT COIN blocking correction
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- plots of CTime.CoinTime_RAW_ROC2
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- features of plot vary as expected with current, more tails outside valid
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COIN region at high current compared to low current
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- we expect a correction of only a few percent, so the tails only grow
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moderately
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- will form ratios of (window 30-130 ns)/Total and plot versus rate to make
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sure things make sense
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- for actual correction, expect to calculate ratio on run-by-run basis
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- Dave agrees this is a sensible way to proceed
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- re-ran data w/corrected CT offset
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- for some reason, Junaid's offset was off by 0.9ns, this has been corrected
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Chi Kin
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-------
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KaonLT Q2=3.0, W=3.14 LT-sep
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- MM shifting to correct Lambda mass
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- now fitting just the central peak region w/Gaussian, appears to work well
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- Sigma0 contributions
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- tried fitting Sigma peak w/ Crystal Ball function, it works well
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- this is a piece-wise function, with Gaussian in the center and extended tails
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https://www.jlab.org/primex/weekly_meetings/slides_2009_07_17/dmitry/crystalball.html
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- other checks
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- found occasional repeated runs in runlist which needs to be fixed
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- some replay files seem to be corrupted
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- Alicia will see if she has replayed copies of some of these runs
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- for others, suggest to contact Stephen Kay
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Next Meeting
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-------------
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- Fri Sept 12 @ 11:00 Eastern/9:00 Regina
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- KaonLT will go first
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** NOTE THE NEW TIME **
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- this time will be in effect until USA daylight savings time change, after
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which it will switch to 10:30 Eastern/9:30 Regina
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