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Kaon LT Meetings » mtg_23feb23.txt

Garth Huber, 02/24/2023 11:10 AM

 
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                 Feb 23/23 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 - Stephen Kay, Garth Huber, Ali Usman, Alicia Postuma, Nathan Heinrich,
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   Vijay Kumar, Love Preet, Muhammad Junaid
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JLab - Dave Gaskell
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Ohio - Jacob Murphy, Julie Roche
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CUA - Tanja Horn
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Dave G Updates (on behalf of Richard)
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--------------
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EM/PM calculations
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- Met with with Richard on implementing post-SIMC script
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   - Found a few bugs and things that needed to be adjusted
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   - Once meeting was done, seemed to be working ok
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   - Some distributions were looking a bit weird, but seemed to be resolved,
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     particular for EM
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   - don't know yet on how well the new SIMC calculations reproduce data
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Nathan Updates
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--------------
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Ref/Det time cuts
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- Tested on some settings with online analysis scripts
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- continuing on LD- setting that got less events than online analysis
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   - Checked cuts, all looked ok
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   - reran online scripts with identical cuts to new analysis with exception of
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     Ref Time
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   - New cuts reduce # events in LD- Q2=3.85, W=2.62, low eps setting by ~20%
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- Other settings don't see the same effect though, get more after updating
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  ref/det time cuts
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   - For LD- Q2=3.85, W=2.62, center, hi eps the #counts goes up slightly
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   - For LH+ runs checked, the events also go up
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- For LD- setting with reduction, seems uniform across all plots, see similar drop
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  for all types of events - prompt/random
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   - NH thinks it could be due to a PID detector calibration shift with new
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     cuts, and the proportion of good events passing cut has gone down, would
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     need recalibration and adjustment of cuts to be sure
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   - SK: Should investigate quickly to see if it's a uniform reduction or one
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     particular run/set of runs causing weird issues
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   - Setting was in two parts, separated by several days (i.e. we came back to
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     get more statistics after completing other parts of run plan)
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      - GH: Should absolutely compare each part before/after applying new det/ref
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        cuts
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      - Split the 74 runs in this setting into batches? 
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         - Day by day? OR Shift by shift?
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      - need enough statistics in each batch to be able to draw conclusions
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   - in fact, for *all* settings divided into multiple parts by time, the
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     parts need to be looked at separately, and only combined after we are
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     sure everything is consistent
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      - this includes all detector calibrations, etc
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   - *** this study can be done in parallel with detector calibrations, but
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     *** it is essential that we understand what is going on with this LD-
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     *** setting, as a 20% effect is huge!
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Jacob Murphy
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------------
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- No elastic delta scans yet
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   - Recovering from an illness
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   - Working through some old hard coded scripts, getting them going for PionLT
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Junaid Updates
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--------------
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- Busy with NP course
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   - Midterm next week
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- No report on calibrations yet
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Ali Updates
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-----------
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HMS Cal/Cer Efficiency - HeeP Singles Studies to get clean sample of electrons
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- Heep #1 Run 6600 - Ebeam=3.835, Phms=2.835 GeV/c
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   - Cer 97.20%, Cal 99.63%
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   - Much better Cherenkov efficiency
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   - Calorimeter v.good
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- Heep #2 Run 6603 - Ebeam=3.835, Phms=2.713 GeV/c
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   - Cer 97.31%, Cal 99.64%
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- Heep #3 Run 6608 - Ebeam=3.835, Phms=2.583 GeV/c
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   - Cer 97.34%, Cal 99.65%
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- Heep #4 Run 6680 - Ebeam=4.933, Phms=2.583 GeV/c
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   - Cer 97.46%, Cal 99.47%
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- Heep #5 Run 7852 - Ebeam=6.190, Phms=3.709 GeV/c
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   - Cer 97.12%, Cal 99.37%
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- Heep #6 Run 7857 - Ebeam=6.190, Phms=3.491 GeV/c
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   - Cer 97.17%, Cal 99.29%
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- Rate Dependence plot, eff vs rate (S1X)
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   - Cherenkov eff seems to have a fairly slow drop off with rate
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   - Calorimeter has no obvious trend
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   - Not much of a spread in S1X though, ~35 kHz to 70 kHz
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   - Physics rate range is a bit higher, up to 150-200 kHz
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   - DG: considers this study to be ~90% complete
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     1) would be nice to get a firmer handle on the rate dependence
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       - are there physics data at higher rate with favorable pi-/e-?
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     2) need to check for dip in HMS Cer efficiency where mirrors overlap
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       - this hasn't been checked yet after the mirror replacement
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       - 1D plot of Cher eff vs X_cer should be sufficient
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   - Cal eff is often parameterized vs Phms, as the energy resolution changes
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   - Cer eff is usually just a fixed number, unless there's a rate dependence,
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     in which case this rate dependence needs to be understood
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   - NH: a *plot* of Cal eff vs. Phms would be useful, maybe this would explain
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     some of the outliers in the rate dependence plot
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- Next step is to finalise PID
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   - For coin events, pi- background will be removed with CT cuts etc
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   - Should have a fairly clean electron sample with coincidences to find a
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     good efficiency a higher rate
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Vijay Updates
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-------------
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Phi and t binning in progress, full report next week
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- Yield calculation per (t,phi) bin
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   - Will have the rest next week hopefully
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Alicia Updates
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--------------
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- 2nd place in best overall presentation at WNPPC (Winter Nuclear and Particle
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  Physics Conference) in Banff, Alberta
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   - Well done Alicia!
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- Circulated abstract for CAP
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   - Feedback/comments appreciated
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- Depending upon word/character limit, maybe clarify "Transition regime" in
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  abstract
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Next Meeting
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------------
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Thur Mar 2 @ 17:00 Eastern/16:00 Regina/15:00 Mtn/14:00 Pacific
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- KaonLT will go first
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USA savings time starts Mar 12, so we need a poll to find a meeting time.
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GH will circulate one soon.
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