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Kaon LT Meetings » mtg_24feb29.txt

Garth Huber, 03/02/2024 10:30 AM

 
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                 Feb 29/24 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 - Nathan Heinrich, Muhammad Junaid, Ali Usman, Garth Huber, Vijay Kumar,
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   Nacer Hamdi, Alicia Postuma
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CUA - Richard Trotta, Casey Morean
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JLab - Dave Gaskell
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FIU - Pete Markowitz
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Richard
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-------
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- PhD thesis has now been submitted to the committee for review.
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  Congratulations on this milestone!
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LT-Iteration Script Issues
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- uncertainties for unseparated d2sigma behave weirdly when iterating, while
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  the R=model/data ratios behave normally
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  - statistical errors on d2sigma get much smaller after an iteration
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  - clearly there is still a bug somewhere
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  - GH: it sounds like the way the R-error is propagated to d2sig-error is the
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  issue
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Plots of d2sigma vs phi are shown for various settings at high, low epsilon
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- a MM cut is now applied: 1.1<MM<1.18
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- Q2=3.0, W=2.32 is particularly weird, low epsilon significantly larger than
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  high epsilon
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  - for this setting P_HMS=6.6 GeV/c, so maybe that's a hint
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  - Ali: the Heep offsets for this setting over-correct the MM peak, i.e. moves
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    it too far
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Plots of sigL, sigT vs t shown
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- for some settings -sigL is plotted instead of sigL, due to the low
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  epsilon>high epsilon issue
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- clearly this will need significantly more investigation
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Ali
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---
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- was sick last week, only getting back on track now
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Clean pi+,p data for Richard's PID leakage subtractions
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- finished analyzing pi+ for 3 of 5 kinematics, data ready for RT subtraction
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- proton will be done soon
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- no HGC cut used at all
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  - RT will apply the HGC hole cut to his sample, confirms that it will be
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    straightforward to implement
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  - RT still has to resolve the 5cm HGC hole cut shift issue reported a few
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    weeks ago
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    - RT thinks the x_HGC, y_HGC coordinates were not implemented correctly,
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      will return to this soon
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Resuming SIMC resolution study, nothing to report yet
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Alicia
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------
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HMS-delta correction update
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- had a discussion with DaveG a few days ago, after finding that application of
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  DG's delta-correction did not yield the expected improvement to MM resolution
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  - found that DG's MM calc was based on the old 6GeV/ENGINE formula
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  - Alicia is using hcana calculation, and this appears to be the cause of the
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    difference
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  - DG is trying to figure out what exactly is different between the two MM
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    calculations
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  - hcana: takes x',y' and spectrometer angles, converts to spherical theta,phi
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    and calculates PM components
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  - ENGINE: calculates PM components in spectrometer x',y' system and converts
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    to target coordinates, but does not use spherical coordinates at any step
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  - DG: calc in hcana is harder to follow, can't see where the difference is,
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    in principle both calculations should be equivalent
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  - AP: tried to recalculate MM on her own, also agreed that old method is
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    easier to understand
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    - her calculation does not fully reproduce hcana either
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- Alicia shows a plot from script, sees no correlation between delta and hsxpfp
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  for P_HMS<5 GeV/c
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  - Q2=2.1, W=2.95, P_HMS=5.292: starts to see a correlation
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  - Q2=3.0, W=2.32, P_HMS=6.59: a definite curved correlation is seen
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  - will have to apply a correction for these two settings, but it needs to be
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    different than what DG had found
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  - DG: for P_HMS=6.59, are we 100% sure we're using the correct Matrix
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    Elements for this setting?
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    - Ali goes to check, confirms that the correct ME are used for both his and
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      Alicia's analyses
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    - Jacob was looking at finalizing the high HMS momenta ME, Holly is looking
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      at higher P_H MS w/NPS students
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      - clearly there is an issue that needs further optimization
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- Implementing the HMS-delta correction for high P_HMS
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  - DG: can't just correct MM, all kinematics are affected, in principle will
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    affect the t-binning for these settings, as events will migrate from one
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    bin to another
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  - rather than Alicia continuing with her reconstruction script, it will be
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    better to modify hcana to include the correction for high P_HMS, so that
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    all kinematics are handled consistently
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  - DG: suggests fitting a quadratic, but only apply to a certain region of the
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    HMS focal plane
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  - Alicia: maybe a piece-wise linear function?  Will think about what works
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    best
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  - *CONCLUSION* Alicia will first determine the needed delta correction then
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    implement in hcana
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Vijay
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-----
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- Just returned from EIC workshop in India, starting analysis again and yield
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  ratios
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Shows interesting Lattice QCD calculation from workshop
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- Swagato Mukherjee (BNL), Q.Shi will be first author, not yet submitted
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- LQCD calc for both pi+ and K+ to Q2~35
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  - calc indicates that both Q2*Fpi and Q2*Fk will remain high through the full
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    Q2 range, with no significant decrease to pQCD curve
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    - not surprisingly, the Lattice errors are fairly large
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    - we definitely need to keep a look out for the final calculation
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Nathan
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------
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Working on PionLT Lumi study and plots for the SHMS NIM paper
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- looking at what PID cuts to apply for the Lumi study, which also generates
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  the needed plots for the paper
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- SHMS single arm e' Lumi scan
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  - NGC vs Calorimeter
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  - NGC vs Aerogel
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  - NGC vs HGC
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  - GH: suggests to apply NGC vs Calor cut and look at the others with this cut
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    applied to see what is removed before deciding whether the other plots add
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    anything extra to the PID selection (useful also for the paper)
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- HGC, NGC efficiencies vs delta
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  - efficiency plots vs X_cer still in progress
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- HGC, NGC, Aerogel 2D efficiency plots vs X,Y_FP
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  - see hole in the HGC, NGC and tray boundaries in Aerogel
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- LH+ production data PID plots shown
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  - LD- also quickly looked at, sees large e- peak in SHMS
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Next Steps:
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- make sure sure Lumi script is working properly
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  - RT will meet with Nathan separately to go over what changes he needs to
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    make to Lumi script
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  - In addition to changes since 2021, Nathan will have to modify the script to
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    handle Lumi runs where only one arm data at a time (should be straightforward)
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- apply proper cuts on data ranges
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Junaid
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------
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Working on PionLT efficiency studies
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- investigating outlier runs, removed bad runs from plots
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  - most of these had beam trip issues
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  - also some runs with quadrupole trips
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  - DG: how do you remove these runs from the analysis?
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    - run list is modified, so these runs will never be replayed in future jobs
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- tracking efficiency studies nearly complete
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- generating beam cut files from replays
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  - will be included in future replays
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Heep-check analysis preliminaries
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- looked closely at the kinematics for all Heep-Coin settings in 2021-22
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  - selected 9 of the 16 settings for further study, based on the angle and
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    momentum settings
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  - GH: the other 7 settings will be kept in reserve for a future student to
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    look at
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  - did not look at list of Heep-singles runs yet, it's a very large list of
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    settings
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    - will first look at the Heep-coin results and from there decide which
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      Heep-singles settings are helpful to look at
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Nacer
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-----
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Efficiency studies for 3.8, 4.9 GeV KaonLT data
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- Plot of CPULT vs COIN trigger rate
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  - sharp drop off seen above 2.8 kHz
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  - looked at the outlier run near 2.8 kHz, where the CPULT relation kink
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    - no comment in run sheet, will look next at hclog
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  - DG: are the rates corrected for the beam off time?
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    - will have to look more closely into this
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- Plot of SHMS_pion_sing_TrkEff
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  - vs SHMS_3/4 trigger rate
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    - 2 outliers seen
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  - vs S1X rate
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    - 3 outliers seen
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Next Meeting
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------------
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- Thur Mar 7 @ 15:00 Eastern/14:00 Regina
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  - PionLT will go first
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- USA daylight savings switch is following week
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  - meeting time will remain at 15:00 Eastern, which switches to 13:00 Regina
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  - GH will send Zoom invitations up to end of August
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