July 6/23 PionLT/KaonLT Analysis Meeting Notes ---------------------------------------------- (Notes by GH) Today: KaonLT will be discussed first Please remember to post your slides at: https://redmine.jlab.org/projects/kltexp/wiki/Kaon_LT_Meetings Present ------- Regina - Garth Huber, Ali Usman, Muhammad Junaid, Nathan Heinrich, Vijay Kumar, Alicia Postuma CUA - Richard Trotta, Tanja Horn JLab - Dave Gaskell FIU - Pete Markowitz Ohio - Julie Roche CSULA - Konrad Aniol Richard Updates --------------- Meeting with Peter Bosted is tomorrow at 13:00 Eastern Zoom Mtg ID: 815 5260 0153 Passcode: 746974 HGC cuts and efficiency calculations - applied one of Vijay's cuts, but it looks too small in comparison to hole in NPE vs (x,y), the data are 10.6GeV, maybe the cut is for 8 GeV? - Vijay drew several versions of the cuts, needs to look them up - Vijay thinks he drew the cut on Efficiency vs (x,y), not NPE - will look up older reports, and meet with Richard on this after meeting with PeterB BCM calibrations - DG: PeterB doesn't use the most updated analyzer, it does not have Dave Mack's high current non-linearity correction in it - if you apply PeterB's BCM correction, you are double-applying the non-linearity correction Ali Updates ----------- - updated standard.database to read in proper BPM files for each run period - setting up scripts for LT-analysis - want to finalize t-binning as Alicia needs this too - needs diamond cuts to be applied first - want to compare cuts w/ Alicia, should overall be similar, except for HGC cut - AP reminds us that she will do a HGC cut dependence study, but no HGC cut will be used in the final results, as the asymmetries are very similar but with larger errors - running SIMC for pi+n, pi+SIDIS, pi+Delta0 - working on offsets - reran Heep singles w/ updated BPM, to give more data points at mid-HMS momentum Vijay Updates ------------- Working on HMS calorimeter efficiency study - DG had suggested plots vs p_HMS for fixed cut Left: >0.2 cut Right: >0.7 cut Three data sets: p_HMS=0.448, 1.35 2.25 GeV/c - efficiency is high and stable for >0.2 cut - efficiency for >0.7 cut is very low at 0.448 GeV/c - DG: apparently Dave Mack found that FADC threshold was set too high, caused inefficient calorimeter regions for P<1 GeV/c - had forgotten about this, now agrees that it's okay to use a lower cut for low HMS momentum - does Vijay have a calorimeter plots that we can look at Yes, but needs a few minutes to find them Alicia Updates -------------- Waiting on t-binning from Ali Working on PARTONS GPD library - sigl, sigt, siglt, etc are private functions only - modifying code to implement new classes to allow these cross sections to be outputted - since DEMP reactions are only recently implemented, unlike DVCS, only asymmetries are output so far, and thinks it's likely the authors haven't gotten around to doing this yet - JR: suggest reaching out to the authors to see if they have any suggestions or warnings on doing this - will have a tutorial next week on running PARTONS - Julie is interested, we will circulate a Zoom link when it's scheduled Vijay (2) --------- Shows plot of H_cal_Etottracknorm - looks very clean, no pion background even below <0.2 at 0.448, 1.35 GeV/c - applied cuts: HMS Cherenkov, CoinTime prompt peak - DG: at these momenta, the TOF differences between pions and electrons are large, we need to see what the plot looks like when accidentals are included, as accidental coincidences cut could cause issues - Vijay will quickly replay one run so we can see the plot Nathan Updates -------------- More work on SHMS HGC calibrations - more data points so we can see the trends in the data - the decreasing trend up to run ~13900 looks to be real - this apparently corresponds to when 7.9GeV beam began - after this, the calibrations are stable all the way to the end of the 2022 run - suggests to take a constant calibration for all runs after start of 7.9GeV beam to end of 2022 - for sloping part, fit calib data with a line and calculate middle value for a setting - TH: suggest two plateaus (beginning and end) and a linear part in between PMTs 3,4 show the early plateau more clearly compared to PMTS 1,2 - GH asks about some gaps in the plots - plot shows calib setting by setting only, with point at the earliest run number - GH suggests that for settings taking longer than a day that the period be sub-divided, and calculate from the linear trend for each period, maybe even for each individual run number if that is easier to set up - Some discussion on what is causing the decreasing trend in the calibration - we know the HV monitor was stable, so the PMT gain should have been stable - JR: is the HGC signal going through a pre-amplifier? - DG: for sure the NGC was, need to check about the HGC - GH: please try to look at the hclog during the period while 9.2GeV beam was being tuned (only a few shifts) and see if there is a log entry on if anything was adjusted Junaid Updates -------------- Updated DC calibs for both spectrometers - will post slides and sample plots (shown last week) on RedMine Working on HMS calorimeter - fixing path issues - hoping to see some plots next week Jacob ----- - Julie informs us that Jacob is taking a medical leave of absence until December - we hope he is doing okay Vijay (3) --------- Replay of one 2.2 GeV/c run is completed - plot w/o CoinTime cut shows small grass <0.2, with a minimum at 0.3 (on log scale) - DG: agrees that a cut at either 0.2 or 0.3 is reasonable - thanks Vijay for showing all of these plots on a short time scale Next Meeting ------------ - Thur July 13 @ 16:00 Eastern/14:00 Regina/13:00 Pacific - PionLT will go first