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Jan 11/24 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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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, Ali Usman, Alicia Postuma, Muhammad Junaid, Nathan
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Heinrich, Vijay KUmar, Nacer Hamdi
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FIU - Pete Markowitz
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CSULA - Konrad Aniol
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JLab - Dave Gaskell
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CUA - Richard Trotta, Tanja Horn, Casey Morean
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Richard
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-------
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Failed jobs in Q2=2.1 W=2.95 replay
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- presented list of runs that consistently failed replay
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- get a corrupted ROOT file
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- had to retry some runs several times
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- errors are put into a logfile on volatile for checking
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- for one Dummy Run (7897) got a dtype error
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- likely a pyroot/C++ pointer issue
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Update on XSect iteration script
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- now doing a 2D fit function of both Q2, t-dep, instead of two 1D fits
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- fitting equations are now consistent with what is in SIMC
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- it's also *important* to check that the weight recalculation script (after
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the iteration) also uses the same equations
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Ali
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---
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Working on other kinematics for piDelta BSA, including Left, Right settings
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- doing shape study for t-bins where we have good statistics
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- drafting text for Trento workshop whitepaper on Transition GPDs
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- will circulate something to rest of group soon
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Vijay
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-----
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Working on LT-sep analysis
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- having difficulty getting fits of model parameters to L/T/LT/TT to converge
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- GH is happy to help look through code to see if he spots anything
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Alicia
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------
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Similar to Richard, issues with replay scripts failing
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- redid failed runs by hand, nearly done
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Dave
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----
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Further investigation of MM resolution issue
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- plot of hsxpfp vs. MX, Run 4916, P_HMS=5.292
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- in 6GeV era, a saturation correction to delta was derived and implemented in
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ENGINE
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- this correction exists in hcana, but is turned off, since the needed
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correction depends on the used HMS matrix elements, which are different now
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than 6GeV era
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- need to refit the correction for new HMS matrix elements
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- Dave does an ad-hoc correction, which seems pretty effective
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delta_corrected=delta-6.0*hsxpfp
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- reduces sigma_MX=7.34MeV to 6.27MeV
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- other HMS momenta will need different corrections
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- Ali & Alicia will point DG to the correct ROOT trees for other HMS
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settings, and he will come up with corrections for other HMS momenta
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- this effect came from the current offset in the Q3 power supply
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- this power supply was replaced in 2021 (recall the fire!), no longer an
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issue, correction needed for KaonLT data, but DG checked the data and
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PionLT data are okay
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- DG: after removing the hxspfp correlation, which will improve the resolution
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of the data, we will then need to adjust the resolution in SIMC to match the
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data
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Nacer
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-----
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DC calibration checks
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- lots of useful help from Junaid
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- K+ event cuts give poor statistics, should re-try with pi+ cuts, which have
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~10x more statistics
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Junaid
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------
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Working on tracking efficiency scripts
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- was using wrong LTsep package, scripts now working with Richard's help
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- will have some results soon
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The rest of the meeting was giving comments on Richard, Nathan, Alicia's slides
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for next week's Hall C workshop
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Next Meeting
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------------
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- no meeting next week due to Hall C workshop
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- thanks for filling out the poll, we will continue to meet on Thursdays at
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same time
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- Thur Jan 25 @ 15:00 Eastern/14:00 Regina
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- PionLT will go first
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