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Kaon LT Meetings » mtg_23mar02.txt

Garth Huber, 03/02/2023 06:45 PM

 
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                 Mar 2/23 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, Alicia Postuma, Muhammad Junaid, Nathan Heinrich, 
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   Vijay Kumar, Ali Usman
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CUA - Richard Trotta, Tanja Horn
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JLab - Dave Gaskell
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FIU - Pete Markowitz
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Ohio - Julie Roche
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CSULA - Konrad Aniol
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Ali Updates
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-----------
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Update to Heep singles, request to plot HMS_cal_eff vs P_HMS
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- see a small decline with momentum, up to 4 GeV/c
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- DG: resolution effect should give lower eff for P<2 GeV/c, not a decrease at
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  higher P
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   - best to call this a constant 99.5% efficiency with a small point-to-point
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     uncertanty to take into account the variation
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   - doesn't see any reason for efficiency to decrease for P~6 GeV/c in physics
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     data
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- AU: will keep an eye on this in physics analysis, as COIN cuts may clear
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  things up for P>4 GeV/c
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HMS-Cer-Ef vs (x,y)_CER is still to do
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For next 2 weeks:
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- starting pion PID for physics
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   - initial look at Q2=2.1, 3.0 settings and finalize PID cuts for both pi+n,
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     pi+Delta0 final states
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   - since Ali's foreground is Richard's background, and vice-versa, they will
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     coordinate
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Richard Updates
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---------------
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SIMC to hcana variable calculation script
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- DG and RT fixed everything, various bugs found, finding an errant minus sign
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  was particularly important
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- data MC comparison looking better
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   - SIMC distributions still a bit narrower than data
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- DG: CaFe expt recently found that their fast raster correction in hcana had
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  the wrong sign
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   - this affects delta-reconstruction, it would be slightly wrong, resulting
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     in worsened resolution
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   - this is worth checking in our data too, try reversing sign and see if
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     resolution improves or not
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- fortunately RT had this plot available, shows Raster-Y vs EM
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   - looks like there might be a small negative correlation
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- TH: In Fpi-2, there was also a correlatino that needed to be corrected for
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   - see p.107 of her thesis
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- DG: how confident are you in BPM calibration in replay?
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   - this would also affect Y-tar reconstruction, in addition to Raster
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   - RT: using Carlos Yero's calibration, so believes it's fine
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LT-sep code: average kinematics & xsects
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- shows some plots for Q2=5.5, W=3.02, t=0.01-1.99, Diamond-cut applied
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   - trial bins: 3 t-bins, 10 phi- bins
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   - BLACK=center, RED=left, GREEN=right
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   - right setting high epsilon looks high compared to others at high -t, lower
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     -t bins look fine, so not sure what's going on
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- SIMC statistics look too low, GH suggests to run SIMC longer so that
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  statistical errors in EXP/SIMC ratio are dominated by uncertainties in data,
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  not MC
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- GH: Ratio plotting scales need more care, remember that Left & Right SHMS
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  settings have some phi bins that are barely populated
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   - they may end up with weird ratios, but also these ratios have huge errors,
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     they can be safely ignored
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   - make plot ranges to concentrate on those phi-bins which have good
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     statistics
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- GH: also please take a closer look at the EXP/MC plots that were used
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  historically (such as in LT-sep procedure slides, and make plots similar to
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  those, so that we can more readily interpret the results
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For next 2 weeks:
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- add more variables to SIMC conversion script
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   - push it to SIMC main repository, so it is a resource for others too
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- try to see what's going on with right SHMS setting with weird normalization
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AU: now that SIMC conversion script is working, wants to test if PBosted
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  offsets work for our data or not
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Vijay Updates
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-------------
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Q2=0.38, 0.42 analysis
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- updated MMpi cut 0.96->0.98
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- shows events per t-bin after all cuts
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   - statistics per bin look pretty consistent
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   - TH: binning looks okay, highest -t bin is wider, but this is always an
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     issue
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- working on average-kinematics files, shows some examples
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For next 2 weeks:
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- complete input files for average-kinematics
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- plots of SIMC vs Data
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   - GH: please coordinate with RT so that your plots are in same format, so
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     that we can more easily interpret them and spot inconsistencies or errors
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Nathan Updates
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--------------
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Aerogel Calibrations now running
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- plotting time-dep and run-dep of calibrations
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- hoping for one calibration per index, but will see after making plots
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Looking more at LD- setting which had yield decrease after new RefTime cuts
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- re-running w/Stephen's online setup
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Next Meeting
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------------
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Thur Mar 9 @ 17:00 Eastern/16:00 Regina/14:00 Pacific
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- PionLT will go first
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New Meeting Time after USA savings time starts on Mar 12:
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- we agree to change meeting time to 
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  16:00 Eastern/14:00 Regina/13:00 Pacific
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- GH will set up Zoom reservations and send out calendar invitations
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