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