Mar 27/25 PionLT/KaonLT Analysis Meeting Notes ---------------------------------------------- (Notes by GH) Today: KaonLT will be discussed first Present ------- Regina - Garth Huber, Ali Usman, Alicia Postuma, Nathan Heinrich, Vijay Kumar, Nacer Hamdi, Muhmmad Junaid CUA - Tanja Horn JLab - Dave Gaskell FIU - Pete Markowitz Ohio - Julie Roche Virginia - Richard Trotta Alicia ------ Update on Geant4 proton absorption simulation - last week, we reviewed a substantial change in missed tracks vs momentum, investigating this more deeply to understand what's going on - interesting observation: many tracks stopping in the simulation produce energetic secondaries that produce tracks and apparently satisfy the trigger conditions - total interactions are indeed nearly momentum independent, as expected, but this is not the right criterion as an interaction does not necessarily equate to a lost event - total interacting tracks is very similar to spreadsheet prediction - for incident protons, the largest fraction of secondaries is protons, followed by neutrons, then gammas, pi+ - at 10 GeV/c, ~90% of reactions produce energetic secondaries - whether you count the secondary depends on where it is produced, its energy, etc. - correct for: Missed Events= Missed 3/4-Trig + 3/4-Trig with wrong PID - added to simulation the predicted signals from PID detectors for the secondary particles - user would evaluate a correction for their analysis based on cuts applied - Garth: while this is fresh in Alicia's mind, it would be good to compute proton corrections for all of her physics settings. After that, maybe can do a tutorial to show everyone else what to do - Alicia also plans on writing up a tech report with instructions - Well done Alicia, this looks like a really useful tool! Junaid ------ Setting up for PionLT Q2=3.85, W=2.62 LT-separation - using Aerogel and RF for pi+ PID - compared MM between data and SIMC - fit peaks to determine MM shift to data - low epsilon settings require negative offsets - high epsilon settings require positive offsets - in both cases, the shifts are about 5 MeV - decided on a MM region cut of 0.90