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Kaon LT Meetings » mtg_23jun28.txt

Garth Huber, 06/29/2023 03:42 PM

 
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                 June 28/23 PionLT/KaonLT Analysis Meeting Notes
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                 -----------------------------------------------
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                                (Notes by GH)
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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, Ali Usman, Muhammad Junaid, Nathan Heinrich, Vijay Kumar
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CUA - Richard Trotta, Tanja Horn
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CSULA - Konrad Aniol, Shawn Love
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FIU - Pete Markowitz
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Nathan Updates
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--------------
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HGC calibrations
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- a few runs last week had a failed fit.  Results shown have most of these runs
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  fixed.
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PMT2: Two early periods (run ~11,800 and ~13,000) have very different calib
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  params (much higher) than the rest (~14,000-16,500)
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  - the runs near ~11,800 are when the HGC had bad gas, so not a surprise
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    they're different, but the second group ~13,000 are unexpected
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  - replaying more runs to fill in the gaps from ~11,800-14,000 to better
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    understand the trend
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PMT1: similar trend, with two early periods different than the rest, but the
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  discrepancy is smaller
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PMT4: very similar to PMT1
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PMT3: some bad fits that obscure the trend, but after removing these, the trend
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  is once again simlar
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- good news that all PMTs have same general trend, but the early runs that are
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  different than the rest are a puzzle
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Next week: 
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- expect to finish up the HGC calibs
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- trying to set up a meeting w/ Jacob & Junaid on next tasks after calibs done
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  - expect NH & MH will split up calorimeter calibs
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- will push changes to GitHub after Junaid finishes DC, as he has more files to
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  upload
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  - NH posting other det calibs to RedMine
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Junaid Updates
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--------------
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DC calibrations
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- SHMS LD- data (2022) in progress, everything else done
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- plots of residuals and drift distributions
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  Blue=old calib  Red=new calib
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  - residuals centered at zero and generally sharper than before, double peaks
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    gone
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  - drift distn plots flat for all planes, looking good
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- expecting to be done in the next day or so
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  - then will push to GitHub
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Richard Updates
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---------------
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Updated HGC analysis script
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- will divide HGC into 3 regions (depending how you count)
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  0) inefficient "hole" at mirror overlap will be removed
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  1) region near hole that is mid-efficient
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  2) rest of the focal plane that has high efficiency
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- GH: need to recheck NPE vs XY_hgc for every setting, just to make sure the
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  region divisions do not change
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  - the Cherenkov cone angle depends on particle velocity, so as SHMS momentum
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    changes, the cone angle changes, and this could affect the size of the
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    inefficient regions
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  - not expecting you will have to re-draw the regions for every P_SHMS, but
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    for sure it needs to be checked
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  - also, the mirrors were reconfigured in Jan/19, resulting in smaller hole
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Luminosity analysis
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- Peter's BCM correction has improved the higher current runs, the plot is
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  flatter than before, but some points have bad error bars (current cut needs
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  adjustment)
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- will use HMS ELCLEAN (from physics Lumi scan) for LH2 boiling correction in
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  cases where Heep did not provide full coverage
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  - will meet with PeterB next week on this
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  - GH: since the physics Lumi scan is also supposed to be used for the FADC DT
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    correction (according to PeterB), I don't understand how you will be able
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    to disentangle using the same data for both LH2 boiling and FADC DT corr
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    - RT will discuss this with PB as well
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Ali Updates
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-----------
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- catching up after CAP Congress last week
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- rerunning Aerogel Efficiencies for higher NPE cut for K+ PID
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HMS Momentum Offsets
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- showed DG's plot of offset vs P_HMS determined from KaonLT Heep and XEM
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  singles data
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  Red=XEM electrons  Blue=XEM protons  Triangles=Ali's Heep results
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  P_true = from Heep check  P_nom=from magnet setting
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  - both XEM and KaonLT data show same general trend, but the dip in momentum
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    offset (to ~0.993) at ~4.5 GeV/c is much deeper for the XEM data
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  - DG has confirmed that program that sets HMS magnets is "not significantly
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    different" between KaonLT and XEM, despite the two experiments running
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    years apart
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  - DG believes the sharper XEM dip is due to their not using the latest BPM
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    calib
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  - however, since XEM singles are not over-constrained, it sounds like they
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    are obtaining their offsets from fixing W value, and attributing all
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    difference to HMS momentum
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    - GH: this assumption may not necessarily be true, if so it could lead to a
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      larger offset than Ali, where an over-constrained reaction is used
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- KaonLT Heep does not have as many points as XEM singles, so Ali is going to
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  look at offsets from Heep singles data
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  - likely will have same issue as XEM singles, but at least would confirm
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    trend
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  - also considering to get offset from PionLT Heep after DC calibs done
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Starting to look at LT-separation code
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Vijay Updates
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-------------
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Lumi studies from Summer 2019 data
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- got EDTM livetime working
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  - only two runs have LT>1.0, but by less than 1 sigma
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  - GH: it will be useful to add CPULT to the plot too, so we can compare
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HMS calorimeter efficiencies
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- working on a plot of efficiency vs P_HMS
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  - expecting a drop in efficiency for P<1 GeV/c
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  - looking at Heep runs at all 3 epsilon, but also will need to look at the
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    physics data to access low P_HMS
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  - DG has suggested to keep the cut constant and look at the trend of the
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    efficiency
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  - GH: try to make plots for fixed cuts: >0.2NPE and >0.7NPE
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Next Meeting
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------------
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- Thur July 6 @ 16:00 Eastern/14:00 Regina/13:00 Pacific
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- KaonLT will go first
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