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Kaon LT Meetings » mtg_23mar16.txt

Garth Huber, 03/16/2023 05:49 PM

 
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                 Mar 16/23 PionLT/KaonLT Analysis Meeting Notes
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                 ----------------------------------------------
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                           (Notes by GH and SJDK)
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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 - Stephen Kay, Garth Huber, Ali Usman, Alicia Postuma, Nathan Heinrich
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   Vijay Kumar, Muhammad Junaid
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JLab - Dave Gaskell
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CSULA - Konrad Aniol
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CUA - Richard Trotta, Tanja Horn
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Ali Updates
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-----------
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Q2=2.1, high/low epsion PID study
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- need to work around lack of RF info for some 10.6GeV data
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- Still working on finalising procedures/debugging scripts
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Richard Updates
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---------------
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Carlos/Casey reported they still had rate dependence issue with Lumi scans at
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recent Hall C meeting
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- See Carlos' slides on DocDB
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- Will discuss with Carlos next week
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- Yield dependence vs beam current believed due to accidental hits blocking
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  coin events
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- Applies a coin blocking factor to remove rate dependence
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- DG: In online CaFe results, Carlos did not have very tight cuts around T1/T2
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  that go into forming coin time
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   - things should look better with tighter cuts, but no final study done yet
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   - PB is also applying a rate-dependent correction, believed to be due to
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     FADC deadtime
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   - might be impossible to disentangle the two effects
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Investigatng strangely large yields previously seen for Right settings of 
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Q2=3.0, 2.1 and 5.5, 10.6GeV data
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- Thinks this is somehow a replay level issue
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   - Farm issues stopping them running, replaying again now that's fixed
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- Maybe an issue with TDC cuts?
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- Might not be the right that's the problem, could be left and centre
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- Real to random ratio very different between left/centre and right
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- Alicia doesn't see the same weirdness with the right setting for same data
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   - Alicia's right setting has smallest yields, center is largest, as expected
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   - Used files from Ali?
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   - *Should* be the same param files?
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   - Customised these to add helicity
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   - Clearly, Alicia's different result greatly constrains the possible sources
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     of the problem Richard sees
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   - Richard will compare with Ali and take a look
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SIMC EM/PM scripts
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- Need to meet and discuss with DG about pushing SIMC scripts to GitHub
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Garth/Ali/Vijay/Richard met yesterday to discuss LTsep parameterisation
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- V. Useful
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- Slides at: https://redmine.jlab.org/attachments/1811
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Vijay Updates
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-------------
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- Created kinematics files for LTSep analysis
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- Created input files for average kinematic script
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   - Testing this script with input files
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   - Still a few bugs to fix
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- Working on understanding the cross section model and iterating over the
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  parameterisation
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   - Garth has some ideas he will discuss via email
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- Need to go back and deal with normalized yield issues after understanding
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  model cross sections
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Nathan Updates
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--------------
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Aerogel Calibrations
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- Found the source of difference between Petr's method and old method
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   - Petr fits on NPE while old method is fit on adcPulseAmp
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   - To get back the calibration param value, just multiply by the current
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     calibration value
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   - SK: you could just give Petr's code CalibParam=1, so it fits FADC value
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- Plotted params as fn of run number
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   - Petr's error bars are much larger than the variance of the calib data, so
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     doesn't use them when computing means
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   - 4+ looks like it has a trend vs time, 4- looks relatively stable
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- Added position cuts
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   - Also added HGC cut
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   - With tray and HGC cut, remove basically everything
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   - Probably not much to be gained by adding cuts in?
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   - DG: fiducial cuts are important for the global fit method, because want to
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     be sure you have only particles expecting to give Cherenkov light
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- DG: need to take time-dependence of calib into account, as otherwise the
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  aerogel efficiency is time-dependent (worse!)
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- TH: break the calibrations into periods based on settings, then time-dep
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  automatically taken into account
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  - NH will break up the data into chunks
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Next Meeting
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------------
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- Thur Mar 23 @ 16:00 Eastern/14:00 Regina/13:00 Pacific
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- PionLT will go first
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Join Zoom Meeting
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https://uregina-ca.zoom.us/j/98128937341?pwd=TzdMNlVJSzVFaGNpenBBcGlGSTJxUT09
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