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Kaon LT Meetings » mtg_23nov02.txt

Garth Huber, 11/02/2023 06:55 PM

 
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                 Nov 2/23 PionLT/KaonLT Analysis Meeting Notes
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                 ---------------------------------------------
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                            (Notes by GH & AH)
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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, Ali Usman, Garth Huber, Vijay Kumar, Nacer Hamdi,
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   Alicia Postuma, Muhammad Junaid
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York - Stephen Kay
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CUA - Richard Trotta, Tanja Horn
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FIU - Pete Markowitz
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Stephen
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-------
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Update on the NPS experiment data taking
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- Shared some of the challenges the Hall C team had during the current data
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  collection
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- Mentioned Problems with the DAQ system
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  - unlike PionLT, lots of DAQ reconfigurations in a cyclic order
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  - Target Operator will be very busy because of the DAQ issues
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- They were also facing spectrometer magnet issues, where response time delay
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  is observed
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- Junaid has not yet received his US visa.  If it is not issued by Nov 20, he
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  will need to cancel his shifts, so others have time to fill them
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Richard
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-------
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Checking effect of Heep offsets received from Garth
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- GH provided offsets for different energy sets
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  - Richard tried using global offsets for all 5 KaonLT beam energies
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  - The offsets work for low energy, but need to be different at high energy
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    - observe a progressive shift in EM distribution with beam energy, other
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      variables are more stable
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  - Richard tried ad-hoc adjusting SHMS momentum offset to fix this
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    - for dpp -1.0000: The W looks good, but the E_miss is worse for high
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      energies
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    - for dpp -8.0000: the inverse happens for E_miss
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    - Need to investigate the E_miss sensitivity to the offsets
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- Garth suggests instead to try the offsets for just the 3 highest beam
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  energies
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  - Tanja: it seems that it will not be possible to find a set of offsets 
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    that work for all data, will need at least 2 sets
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  - Garth thinks 3 sets of offsets are needed:
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    - Summer 2019 low beam energy offsets (Vijay's data)
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    - 3 highest KaonLT beam energies (Richard and Ali's data)
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    - 2 lowest KaonLT beam energies (Nacer's data)
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- had a sign issue last week compared to Vijay, this is corrected now
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- Out of Plane offsets
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  - tried applying Garth's PMY offset, did not shift PMY very much
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  - RT just realized had wrong sign on SHMS offset
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  - Garth: Check the instruction for the correct implementation of the computed
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    offsets
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- Vijay: maybe worth comparing the OOP offset between data, rather then MC
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  vs. data
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  - Garth will make a plot with PMY data only (not data-SIMC), maybe it results
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    in a slightly larger OOP offset
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Vijay
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-----
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No update, just completed Chapter 2 of thesis
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- Will check the effect of the computed OOP offsets for his data as well
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- Lumi analysis will be next after OOP offset
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Ali
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---
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Beta cut efficiency studies
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- Looking at Heep coin data (cleaner data), to study Beta cut efficiency, due
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  to Coin time issues for 10.6 GeV data.
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- still looking at cut-dependence
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  - with original cuts, got ~95% for COIN events at 10.6 GeV, but ~98% for 6.2,
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    8.2 GeV data
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  - want to understand how the cut-dependence particularly affects the low
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    epsilon data
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- Showed CoinTime vs Beta SHMS: See a tail at high Beta without PID cut
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  - 6.2 GeV: no boomerang, but long tail up to beta=1.8 (Heep data)
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  - maybe try only a beta lower limit cut, no upper limit cut
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- Tanja: agrees can put PID cuts to study beta-efficiency
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  - need a CLEAN SAMPLE, then while identifying these events, adjust the cut
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  - try different PID cuts to clean the sample to a level were they become
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    not sensitive to the cuts
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Alicia
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------
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Draft slides on 10.6 GeV CT issue for the Quarterly Analysis meeting
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- Discussion on the observed CoinTime issues at 10.6 GeV.
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- Garth still has to put together his slides on Offset studies
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Nathan
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------
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Checking if Coin time reference time cuts make sense, as suggested in his
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committee meeting
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- Tcoin.pTRIG1_ROC1_tdcTime vs CTime.ePiCoinTime_ROC1 and same vs ROC2
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- TDC time TRIG1 and TRIG4 were used to compute reference time
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  - get various multiple-pea histos and diagonal correlations, very difficult
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    to understand
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  - will make a quick script to look at a wide range of Run#
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- Tried different cuts and replayed to see the effects
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- Goal is to pick a peak in RawTDC distribution and place appropriate cut
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  values in cutfile
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  - checking if cuts are correct on: pTRIG1,4_ROC1,2
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  - do not yet know what the cut on hT2 is for
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Junaid
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------
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Continuation of Hodoscope calibration
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- the gap noticed on the 2D plots in Beta vs Delta is removed after turning off
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  the HGC cut
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- Moving to drift chamber calibration
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Nacer
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-----
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Working on Kaon LT data @ 3.8 GeV
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- After noticing some quantities offsets (Beta SHMS) from their expected
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  values, a new replay was submitted
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- maybe the last replay was not done with the final calibrations?
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Next Meeting
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------------
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- Thur Nov 9 @ 15:00 Eastern/14:00 Regina
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  - PionLT will go first
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- Please send and post the notes from last week's meeting
(311-311/413)