Stephen Kay Stephen Wood Dave Gaskell Konrad Aniol Jacob Murphy Ali Usman Alicia Postuma Nathan Heinrich Richard Trotta Love Preet Vijay Kumar Erika Gwin PionLT First Today Jacob Updates - Journal clubs resumed at Ohio - Presented first, had to work on condensing 15 pages of theory paper into a coherent talk - HMS optics page on wiki updated, looks nicer than Stephen's summary one - Stephen will send on location to move these to - Probably best to divide this into HMS/SHMS optics pages - Add columns/comment on data location and when it was taken - KaonLT Autumn 18 /mss/hallc/spring17/raw and so on - Dave G reiterates that data beyond +-8 in delta for the HMS is hopeless - Jacob - Need to exclude it from trying to do the matrix element fit, will ruin fit in regions we actually care about Nathan Updates - Reference time cuts updates - HMS 3/4 trigger, concern last time that this could cause issues - Shouldn't affect things, comes in after - Confirmed detector variables that should be used for coin with Carlos - Carlos had script to set detector time cuts - hTref1 and 2 give trig and hodo tdc ref times - DCREF 1-5 for HMS and 1-8 for SHMS give the DC adc ref times - Jacob Q - Will any change update anything in std.kin? A - No, will change std.database a lot - Plot on slide 3 is both coincidences and singles at the same time - Dave G - Could set up cuts for coin/singles specifically, 2 sets - hT1/hT2 shifted by ~1 bin, just set based on hT1 - Cut is loose anyway - hDCREF3 furthest to the left, use this for cuts - Slide 24 - Cuts for HMS - Jacob, would be nice to see where these cuts are visually - Nathan, yes would be illustrative, will make plots and add to slides - 3/4 and elREAL coming in at difference times in the SHMS - Slide 43 - Suggested SHMS cuts, tw osets, elREAL and 3/4 - Next step is to look at detector time cuts - Carlos' code, impression is that it checks detector times based upon existing cuts and flags up if there are discrepancies - Dave G emphasies the importance of also checking this too, look at each of the plots - Hopefully code does this Richard Updates - SIMC part of Bill's LTSep code - Richard outlines layout and steps of LT analysis - See slides for details - In Analysed_Prod.py, some naming conventions different in COIN_DATA_Header - Q2, SIMC data had to be scaled a lot - Was this a unit error? - SIMC always uses mC - Dave Q - What model is being used? - A - Using whatever is already in there at the minute - Dave - Whatever is there at the minute, it's using something that was there when he was a grad student - SHMS right setting for Q2 = 5.5 looks bad, lots of pions there, events at -ve -t (!) - Total efficiency for low epsilon values seems very low ( ~45%) - Need to debug this - Look directly at the relevant report file - Finalising offsets, Dave and Richard meeting next week - Need to make sure SIMC variables match up Ali Updates - Presented some efficiencies work in the analysis meeting - Should have calorimeter efficiencies ready by next meeting - SJDK - HGC is also to do - Dave G - Yes will be hard. Also very hard to get a clean pion sample without the HGC - Shuo tried to do HGC free analysis, never got an accurate estimate kaon contamination - May be saved by the exclusive nature of our reaction - Dave G - Will want to do systematic checks on cutting/not cutting on the hole Vijay Updates - Testing analysis code on PionLT 2019 data - Some errors, fixed some, still some to go - Checking coin time cut for pion selection - Will check other PID cuts - Iterate on PID - Python script did work on a single run - Richard - Error most likely that a run is missing from the efficiency list Alicia Updates - Will present some plots/work next week - Run asymmetries for another Q2 setting - Got aluminium asymmetry - See non-zero asymmetry here - Root will fit a non-zero asymmetry to it... - Stephen Wood - Could just assume asymmetry is 0, with some error on it - Propagate error through - Get a smooth background - Can separate events by helicty, can't separate charge by helicity - Didn't have helicity gated scalers during KaonLT run - Work on assumption that charge assumption is negligible even if there is one there - Could add a constant + ASinPhi, if non zero, have a charge asymmetry - Next week -> KaonLT -> Alicia Asymmetries -> PionLT (?)