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Nov 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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Present
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-------
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Regina - Garth Huber, Alicia Postuma, Nathan Heinrich, Muhammad Junaid,
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Ali Usman, Nacer Hamdi
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Virginia - Richard Trotta
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CUA - Tanja Horn
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FIU - Pete Markowitz
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Ohio - Julie Roche
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JLab - Dave Gaskell
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Nathan
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------
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- no report, preparing for tomorrow's committee meeting
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Junaid
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------
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PionLT tracking updates
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- updated geometry parameter files (better drift chamber position data),
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improves residuals
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- Mark's tracking algorithm changes
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- implemented new parameter values to turn on Mark's algorithm changes
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- using his default parameter values for now
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- Heep replays using the new algorithm
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- 5.986 GeV and 10.56 GeV Coin
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- change to W distribution is subtle, tail to left of elastic peak has a bit
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steeper slope (log scale), fewer slightly fewer events
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- 10.56 Exp/MC ratio changed from 1.006 to 1.010, more events passing cuts
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so ratio went up
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- however, the Exp yield was calculated with the old tracking efficiency
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- *NB* new tracking efficiencies using the new algorithm need to be used
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- that will probably result in the ratio getting closer to 1.0
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- updated HMS matrix elements for 6.7, 5.9, 6.1 GeV/c
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- NPS group is still working on 5.6 GeV/c matrix elements
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- some discussion about hdelta_offset hphi_offset values to use
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- *NB* need to use the same values used for matrix element fits
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- this means that for momenta with "old" matrix elements, offset values of
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zero should be used, while for "NPS" matrix elements, non-zero offset
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values that they used need to be retained
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- *NB* i.e. two different sets of parameter files are needed, please be
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careful thiese are implemented correctly
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- Ali: do we need to use the same offsets in SIMC?
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- Dave: SIMC uses its own matrix elements, reconstruction matrix is not
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changed in SIMC, do not apply the matrix element offsets to SIMC
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Nacer
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-----
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KaonLT Heep singles
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- submitted jobs to reanalyze w/Mark's tracking chagnes, but iFarm slow
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- investigated a tighter W-cut for HMS, SHMS singles
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- high tail cut ~1.05
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- moved lower cut from 0.8 to 0.9 to see what happens
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- 8.2 GeV: left tail data extend all the way to W=0
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- 10.6 GeV: W peak is wider, 0.9 cut is clearly too tight, obtain Exp/MC
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ratio R=0.75(!)
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- *NB* need to use W cut that results in less sensitivity, GH suggests a cut
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near the change in slope of left background for each beam energy
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Richard
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-------
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- having problems with iFarm cache being read-only
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- Julie: can only write to cache from batch now
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- Nathan: for interactive login, there is a command to specifically put a
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file on cache
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- will look up the documentation and add to RedMine notes
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Trying KaonLT iterations w/ new TT functional form
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- reduced chi-square now <1.5
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- having an issue with MM_K spectra
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- lambda peaks not lined up correctly with expected mass, different shifts
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for high and low epsilon
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- shift is less for 10.6 GeV Q2=3.0, W=2.32 setting, which was done right
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after Heep (where beam energy offset was determined), other 10.6 GeV settings
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have a larger shift
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- Ali, Alicia saw some ~MeV shifts in their pi+ analyses that had to be
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corrected
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*NB* should cross compare what offsets are needed for all 3 analyses, to
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see if they're consistent
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- GH: *NB* you should write a script to fit just the top part of the MM peak
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for each run, and line it up to SIMC peak location on run-by-run basis
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Alicia
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------
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- PRL manuscript still with reviewers
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Geant4 proton absorption correction
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- read in focal plane variables for an actual data sample
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- store hit position and time in each hodoscope
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- implementing thicknesses from spreadsheet
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- hodoscope (x,y) will be limiting dimension for all materials except the
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aerogel
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- Dave: is it obvious what physics list to use, we're interested in hadronic
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interactions?
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- will start with StandardPhysics list
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Ali
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---
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- no update, working on thesis
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Next Meeting
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-------------
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- Thur Dec 5 @ 16:00 Eastern/15:00 Regina
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- *NOTE* no meeting next week due to US Thanksgiving holiday
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- KaonLT will go first
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