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July 13/23 PionLT/KaonLT Analysis Meeting Notes
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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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Regina - Garth Huber, Ali Usman, Muhammad Junaid, Vijay Kumar, Nathan Heinrich,
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Alicia Postuma
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JLab - Dave Gaskell
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Ohio - Julie Roche
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CSULA - Konrad ANiol
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Nathan Updates
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--------------
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HGC calibrations
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- removed runs with bad fits, trends vs. run number combining results from both
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fit methods
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- linear dep (runs ~11800-12800), flat section, then linear dep (~14200-17000)
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- new version includes slopes for PMTs 1,2 <13600 and >15800
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- added 1% systmatic unc to all points to avoid points with unrealistically
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small errors driving the fits
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- plan is to make param files based on fit lines for every setting, in 24 hour
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chunks, setting up code for divisions of runs
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- DG: apparently can input formulas into calibration database, so the linear
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trend can be calculated automatically by run number instead of by chunks,
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would be both easier and more accurate
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- check w/ Cameron Cotton, hpcentral_offset in hmsflags.param
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- DG: wonder if there is a slow He contamination of the HGC PMTs?
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- GH: agree this is a concern, the trend predicts zero gain in 2-3 years
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- DG will talk to Ellen to install a He sniifer in the SHMS hut
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Corrections to standard.kinematics
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- communicated w/ BradS for angle camera pics
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- old code didn't work, Brad made updates
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Junaid Updates
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HMS calorimeter calib - 2021 run period
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- fixed path issues, working now
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- ran scripts on one run so far
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- sees wiggles in DeltaP vs Edep/P at high delta
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- DG: in general, wiggles are worse at low momentum and get better at higher
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momentum
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- this setting is for 3.7 GeV/c, which is fairly high, so surprising the
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wiggles are this prominent
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- DG: at delta~8-10% it looks like the code has taken pions and put them at
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higher Edep
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- it's dangerous to calibrate beyond +/-8%, as the HMS matrix elements are
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not fit there and we don't use those data anyways
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- H.cer.npe cut is too low, should be >6 pe, you should use tighter cuts to
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ensure a clean electron sample for the calibration, don't use the same
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cuts as used for the physics analysis
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- DG: the wiggles are not a huge concern, as long as there is good separation
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between electrons and pi-, the real concern is the evident gap in the
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yellow electron band at delta=+6%
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- JR: is the gap due to missing blocks?
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- doesn't appear to be, the plot of npe vs XY_calor looks full
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- GH: please check this for other runs to see if the gap persists, or not
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if so, we need to discuss this further
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MJ looking for a good reference to understand the focal plane hourglass shape
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- DG: agrees with GH that John Arrington's thesis is probably the best
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reference, there should be a copy in Lab 119
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Vijay Updates
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-------------
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Stuck on debugging Summer2019 replay code for boiling study
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- last replayed these data in January for SIMC/Data analysis, but not working
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now, due to various system updates done since then
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- will update Lumi and offset studies when replay is working
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Ali Updates
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-----------
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Setting up LT replay analysis scripts
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- replayed some settings for pi+ analysis, also ran SIMC for same settings
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- debugged some analysis scripts, updated cuts
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- debugged diamond-cut script and t-phi binning script
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- a few bugs in plotting script still need fixing
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- generated pi+ SIDIS MC for Portia (summer student) to check background under
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pi+Delta0
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- will forward PeterB's Delta Breit-Wigner shape code to DG for SIMC
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Alicia Updates
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--------------
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PARTONS GPD code
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- reached out to PARTONS authors, Pavel Sznajder replied fairly promptly
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- he gave some suggestions on implementing sig_L,T output, agreed it is a
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good thing to do, they just hadn't gotten around to it yet
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- following formulas to get from helicity amplitudes to cross sections in GK
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2009 paper
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- reference: Kamal Tezgin (UConn) PhD thesis (2022) on implementation of GK
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into PARTONS
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- find a discrepancy between PARTONS output and pi+ cross sections sent
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earlier by Kroll to GH for an experiment LOI that was not approved
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- JR will look for pi0 calculations by GK that AP can also compare with
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- GH will send the HERMES exclusive pi+ paper which also includes curves by
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GK
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Next Meeting
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------------
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- Thur July 20 @ 16:00 Eastern/14:00 Regina/13:00 Pacific
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- KaonLT will go first
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