Nov 9/23 PionLT/KaonLT Analysis Meeting Notes --------------------------------------------- (Notes by GH & AH) Today: PionLT 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, Muhammad Junaid, Nacer Hamdi, Nathan Heinrich, Vijay Kumar, Alicia Postuma FIU - Pete Markowitz JLab - Dave Gaskell CUA - Richard Trotta, Tanja Horn Nathan ------ Making scripts to check RefTime cuts for CoinTimes, will need to do some debugging - probably will need to check with Mark Jones on what variables to use Junaid ------ Hodoscope calibrations - last set of run numbers should be completed this afternoon - 2021 run period: 3 parameter sets for SHMS, HMS only 1 - Summer 2022: only 1 set needed for each of SHMS, HMS - will update param files and push to GitHub - then will move to rechecking DC calibs Richard ------- Applying Heep in-plane offsets - previously tried using Garth's 5-beam offsets with modified dPp - briefly tried 3-beam offsets, prefers the 3-beam offsets, but no results shown - EM has a systematic trend, looks good for 6.2 with offsets, worst for 10.6 GeV - adjust SHMS dPp offset in ad-hoc way to improve EM, while heeping HMS dPe=0 - shows plots of W & EM with changing dPp. W insensitive - noticed that for momentum offset, in particular dPp-0.7%, makes the distributions, including Emiss, have a better match between MC vs. data - also briefly showed some PM distributions: PMX doesn't change much, PMZ behaves similarly to EM - applies offsets w/opposite sign, Vijay did as well - DG: HMS and SHMS momentum offsets have similar action. Did you try changing HMS dPe instead of SHMS dPp? - GH: the SHMS momenta are not large for these Heep runs, P<5 GeV/c, so argument for saturation is not there - would feel more comfortable with a common (moderate) SHMS offset, and try to play around more with dE beam ofset - DG: if you change dPe, then need to adjust beam dE to keep W fixed - RT: we could try to keep SHMS at 0.1% and vary HMS momentum offset Heep OOP offsets - shows plot w/PMY offsets - out of plane offsets dpphi and dhphi unfortunetly do not have much effect Vijay ----- Applied Heep OOP offset - supposed to be same value that RT tried, but he sees a larger effect - in fact, PMY is over-corrected, which indicates applied offset is too large, not too small - RT and VK to discuss offline, maybe RT has a units issue? Alicia ------ Summary of 10.6 GeV CoinTime corrections for Ali - feedback from quarterly meeting using the new variables to help with the CoinTime correction - Mark Jones sent a short write-up on what variables to look at - the first results using it are negative, but need to do more checks on whether implementing it correctly Nacer ----- 3.8 GeV KaonLT beta distribution issue - did a new replay on 3.8 GeV data, but Beta is still shifted to higher values - P.gtr.beta peaked at 1.1 and very broad - maybe something not right in replay scripts, pointing to wrong calibrations? - NH will sit down with AH to look things over - VK says he thought the 3.8 GeV beta distribution should be properly peaked - Also tried an accidentals subtraction, seems to be over subtracting, so need to recheck Garth ----- Heep OOP offsets - one of the feedbacks from Quarterly Analysis meeting was to separate out-off-plane offsets to three fits to get smaller offsets that match different beam energy sets - showed result of revised fit, need to keep the SHMS offset fixed near zero and only refit HMS offset - for Vijay's data the offset would be slightly less than half of global value, the other beam energies would have values more similar to global fit - DG: Still puzzling how is the offsets vary with beam energy, in other words the HMS offsets weirdly vary with the spectrometers postion - GH: agree this doesn't sound physical, but the uncertainties in the offsets appear to be large, so maybe the change is less significant than it seems - PeteM: maybe it's the angle of the beam into the hall that is varying? - DG: these are 3 different beam periods, and the steering into the hall would be different each time, maybe PM is on to something - RT looked earlier at the beam position (so did GH), but not the angle - DG needs a ROOT file w/BPM position info - RT: Below is the location of our replays as well as the run lists for the kaonLT data periods /lustre19/expphy/cache/hallc/kaonlt/Dec_2022/Analysis/KaonLT - Run numbers: Fall 2018: https://redmine.jlab.org/attachments/548/kaonlt_runlist.csv Spring 2019: https://redmine.jlab.org/attachments/768/kaonlt_runlist_8p2-6p2.csv Next Meeting ------------ - Thur Nov 16 @ 15:00 Eastern/14:00 Regina - KaonLT will go first