June 22/23 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, Muhammad Junaid, Nathan Heinrich, Vijay Kumar CUA - Richard Trotta, Tanja Horn FIU - Pete Markowitz CSULA - Mark Mathison JLab - Peter Bosted Richard Updates --------------- Batch submission issues - python script problems, a recurring issue, nothing works now - Lumi scrit that worked last week no longer works - submitted a request to helpdesk, they suggested to increase RAM, but not suprisingly this didn't work - sounds like a python version issue, was something on the ifarm upgraded? Lumi analysis - met with Peter Bosted on Lumi updates and things to add to analysis - suggested a BCM1 correction (this is the most stable BCM during KaonLT) if (current>60) then bcmcorr=1.00+0.045*( log(60)-log(current) ) / (log(60)-log(2) ) else bcmcorr=1.00+0.010*( current-60 )/25 endif PB: doesn't remember exactly how this correction was determined, it was a fit by CarlosY, there should be an entry about it in the SIDIS eLog ~2yr ago VK: Dave Mack says to use BCM2 for Summer2019 data, should he use this correction for that period too? - Carlos' thesis only mentions saturation of BCM1 PB: this offset is appropriate for KaonLT data, the offset will be different for various beam periods GH: for Summer2019, suggest to compare Lumi results using BCM2 and corrected-BCM1, and see which gives a better result Other analysis issues - PB also suggests increasing the Aerogel cut from 1.5pe to 30pe for K+ ID PB: should still get ~95% K+ eff for the Aerogel detector, about ~5% of K+ produce knockout electrons in the aerogel, the reduction in efficiency is offset by improved K+ purity, so is worthwhile - PB: treating K+->pi+ decay background will be tricky, will produce a smeared background at higher MM that may not be included in the pi+ lineshape used for background subtraction - probably not as important for Lambda, but likely relevant for Sigma0 - suggests to run SIMC for piDelta and include in pi+ subtraction, and see if that results in cleaner K+ spectra - Richard is eager to meet with Ali to discuss these developments, maybe as soon as this weekend Vijay Updates ------------- - returned from Stony Brook school, started on Lumi study work, but no report this week - applying Jacob's EDTM calculations, and BCM corrections Nathan Updates --------------- - finished NGC calibrations, plots on RedMine GH: please make a special calibraions page on RedMine and cross-post both NGC and Aerogel calibrations there - Junaid will set up the page HGC calibrations going quickly - showed some example plots, everything looks normal - peak 1,2,3 fit parameters are constrained, it's important to check that the parameters are not "pegged" at the endge of the fit ranges - NH showed a few examples where this is the case, more investigation needed - need to treat period at beginning of 2021 run with bad C4F10 gas differently than the others - not expecting the calibration run divisions to correspond to other detectors at all, will have to be determined separately Junaid Updates -------------- - returned from GRIDS school at TRIUMF, SHMS DC calibs for 2022 in progress - next week will summarize all HMS+SHMS calibrations - then move on to Calorimeter calibs PeterB Comments --------------- - very interested to see final results of optics calibrations - NH: Jacob is writing that section of his thesis, expecting a report to be posted once that part is done - would like to compare his analysis results with Ali after he's done - does not want to bias Ali's result, will wait until the L/T/LT/TT separations are done - PB's Rosenbluth separation procedure is quite a bit different than ours - also interested in eventually seeing Ali's piDelta results - GH: we see continuum events to the left of the piDelta MM peak, between pi+n and pi+Delta0 - Ali should use PB's SIDIS model for uncorrelated bkd in this region Next Meeting ------------ - changed meeting time due to the Hall A/C Summer Workshop Wed June 28 @ 15:30 Eastern/13:30 Regina/12:30 Pacific - PionLT will go first