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Nov 23/22 PionLT/KaonLT Analysis Meeting Notes
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----------------------------------------------
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(Notes by GH and SJDK)
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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, Stephen Kay, Ali Usman, Alicia Postuma, Nathan Heinrich,
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Love Preet
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CSULA - Konrad Aniol
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CUA - Richard Trotta, Tanja Horn
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FUI - Pete Markowitz
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Ohio - Julie Roche
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Glasgow - David Hamilton
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Nathan Updates
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--------------
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- PhD Committee meeting went well
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- Classes to catch up on
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- Likely have an update in ~2 weeks
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Stephen Updates
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---------------
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RF timing resolution improvements
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- Particle corrected RF time working
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- Individual offsets added in
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- Works nicely for various settings
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- Actually helps with the 2ns setting quite a lot, useful for PID here in the
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kaon case
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- trying to remove residual correlation with CoinTime, but didn't get it to
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work yet
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- will push the corrections by particle type soon
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Richard Updates
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---------------
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Variable Differences between hcana and SIMC
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- Emailed Carlos about his calculations
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- Carlos explicitly recalculates everything
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- Will have to redo calculation in SIMC
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- starting to work on SIMC code changes
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Luminosity Scans
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- Ali has been playing with tracking parameters
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- previously was using combined SING+COIN to determine trackeff
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- now using trackeff from SING only
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- improves positive polarity current dependence by 5%, so only 15%
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remaining
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- BCMcurrent offsets
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- tried a 100nA offset, tightened up the rate dependence, makes linear
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target boiling effect more apparent
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- Improvements to this, will try 10nA next
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Bill's LT-sep Code
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- will contact Bill this week about some questions
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Alicia Updates
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--------------
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Beam Spin Asymmetry (BSA)
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- replayed Q2=3, W=2.32, hi-eps, S.Wood earlier did Center setting for
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comparison
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- New analysis script which gets +ve/-ve helicity trees
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- focal plane cuts applied, RF cut is open, PID cuts but no HGC cut
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- S.Wood is looking at the Beam Polarization, so just raw asymmetries so far
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- no dummy subtraction
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- Center setting comparison with S.Wood looks good
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- Left setting has low stats for phi ~ 0
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- Right setting has low stats for phi ~ +/-pi
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- Trying to choose -t bins for the data
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- Equal number of events per bin, not equal widths
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- Combined (roughly) all three settings to get initial view of asymmetry
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t-dependence
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- See sinusoidal relationship in each
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- Amplitude of the asymmetry grows with -t, looks very nice!
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- Question: t binning
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- Ali should probably use consistent binning in -t with the helicity
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analysis, to simplify interpretation of the data
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- Bin 5: *investigate* changing upper cut (i.e. remove some of the long
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tail), to simplify comparison to theory
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- Cut off low -t bin 1 for similar reason
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- Equalize bins 2 and 3 in terms of width?
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- On plot - Centre of each bin is shown, not the average. Could plot vs
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average -t of each bin
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- Q2/W/Epsilon distributions for each -t bin
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- Want average values for each bin
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- Tanja: Should investigate binning in K+ data too
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- Richard can make similar plots to Alicia quite quickly
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- Don't really need asymmetry for both epsilons
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- Just use the one with full phi coverage
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- However, do want high/low epsilon to have the same binning (for Ali's
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LT-separation), so may briefly need to look at the low epsilon t-binning
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- Final fit for sig_LT' extraction will need to include cos(phi) cos(2phi)
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in denominator, in addition to dominant sin(phi) in numerator
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- Missing Mass Plots
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- some background underneath pi+n peak still apparent, but no dummy target
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subtraction yet and cuts are not yet optimized
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- any background under the pi+n peak is likely to have a different BSA than
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the foreground data, will need to do some systematic studies on the effect
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- CLAS (Stefan Diehl) analysis dealt with the background by doing a
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side-band analysis and applied a correction to their data
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- the side-band was selected to be the events to the LEFT of the pi+n peak
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- hopefully we can get our data clean enough that that this is not needed
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Ali Updates
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-----------
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- Discussing with other groups regarding HeeP/Lumi issues
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- looking at changes to track reconstruction params, and pruning params
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- when finalized, will make slides to show details
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- Heep offset issue on hold until variable difference issue is fixed
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- new error calculations for all efficiencies (Binomial instead of Gaussian)
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- should have something to show next week
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Garth Updates
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-------------
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- WNPPC - https://wnppc.triumf.ca/2023/index.html
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in Banff National Park (Rocky Mountains) in mid-February
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- Regina group is sending 5 people. Abstracts will be circulated as they are
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available.
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- If USA colleagues are interested, the Abstract submission deadline is Dec 15.
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Next Meeting
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------------
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Wed Nov 30 @ 8:15 Eastern/7:15 Regina/5:15 Pacific
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- KaonLT will go first
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