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Kaon LT Meetings » mtg_22oct19.txt

Garth Huber, 10/19/2022 02:47 PM

 
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                 Oct 19/22 PionLT/KaonLT Analysis Meeting Notes
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                 ----------------------------------------------
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                           (Notes by GH and SJDK)
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                    Today: PionLT 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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Regina - Garth Huber, Stephen Kay, Ali Usman, Love Preet, Alicia Postuma,
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   Vijay Kumar, Nathan Heinrich, Muhammad Junaid
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CSULA - Konrad Aniol, Emery Gunselman, Johnathan Conrad, Yeranuhui Ghandilyan
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Ohio - Julie Roche
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CUA - Richard Trotta, Tanja Horn
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JLab - Dave Gaskell
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Richard Updates
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---------------
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- Bill LT separation code updates
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   - Stephen and Richard took a closer look at the code, ran into issues,
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     determined it was a compilation issue
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   - Contacted Bill, Bill resolved it very quickly for us over the weekend
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      - Thanks Bill!
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   - Requires a slightly updated cmake version, but this is a trivial change
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   - Need to work on some updates to the code, change how cuts are applied etc
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      - We already do this in our KaonLT code
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      - all hardcoded file calls are fixed
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- Tracking issues with Lumi
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   - SHMS tracked yield still looks odd (-25%)
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   - SHMS scaler analysis has +16% trend
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   - DG: are you using pruning in the tracked analysis?
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      - does not affect efficiency, just how to select best track
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      - it could be there's a higher probability of selecting unphysical track
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        at higher rate (more discussion later on pruning algorithm checks)
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- For the HMS lumi studies - DG comment from Ali's committee meeting
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   - Use ELREAL rather than ELCLEAN scalers
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      - ELCLEAN is much cleaner, might not so affected at high rate
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      - May help yields
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   - Offset in BCM calibration
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      - For low current, could just be a BCM calibration offset (100-200nA) that's
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        causing the difference
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      - then apply same offset to all data NEAR THAT TIME
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      - definitely the 8.2GeV HMS scan shows evidence of the offset issue, as
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        other points are flat ws current, and the first low current point is
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        high
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   - TH: Fpi-2 scaler lumi analysis also had some issues
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      - for +polarity SHMS scan, probably will have to accept what we get once
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        we get the - polarity scans to work out
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- Talk for Hall C analysis meeting
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   - Defining luminosities
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   - Outlining cuts
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   - Will clarify some slides and add a few updates
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      - Will circulate tomorrow before the meeting
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- Richard will be sending an email to Ali & Vijay requesting content for his DNP talk
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Ali Updates
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-----------
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- To Do List:
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   - test Peter Bosted's offsets and see how well they work
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   - Investigate tracking a bit more, i.e. refresh tracking params
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     - SHMS tracking efficiencies in particular still the big issue
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     - believes we use pruning globally, will do some double checking
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     - three different ways to select best track
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   - DG: can apply cuts on many parameters, including xptar, PDF, delta, etc.
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     - has concern that this can bias the track selection
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     - should select a conservative set of pruning criteria that give a fixed
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       rate dependence and use that, but optimal values might change with setting
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     - Peter Bosted tends to be very aggressive with pruning cuts, and not sure
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       if this is the right strategy
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   - GH: suggest to look at lumi runs 5154-5299 (7 runs) and see what the rate
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     dependence looks like under different pruning scenarios
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Vijay Updates
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-------------
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- Busy making slides for committee meeting
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   - Meeting is on Friday morning (10:00 CST)
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- To Do List:
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   - 2.7 GeV pionLT data - need to do the Lumi analysis
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      - Carbon first
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      - Then LH2
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   - Pion/Kaon PID studies: cut finalization, cut dependency
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   - LT Separation
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      - On the cards for next year
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- Some issues with Lumi scripts, need to diagnose
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   - Contact Stephen if encountering errors
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Jacob Updates
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-------------
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- Not at meeting, but will co-ordinate with Richard re:Analysis Meeting tomorrow
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Nathan Updates
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--------------
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- PhD comprehensive done
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- PhD Committee meeting coming soon too, report in progress
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- Need to check with Jacob on his progress for calibrations
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- To Do List:
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   - NGC code updates
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      - Someone mentioned previously (last week?) that there's a new NGC
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        calibration code
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      - Cameron Cotton updated it, can't identify single PE peak in NGC so
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        approach is different
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      - fits a Gaussian to the NPE distribution and infer calibration from the
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        width
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      - GH: a Poisson fit would work better, as the distribution is asymmetric
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        at low NPE
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Junaid Updates
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--------------
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- PhD comprehensive written part is done
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   - Oral exam this afternoon, good luck!
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- PhD Committee meeting coming soon too, report in progress
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- To Do List:
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   - Calorimeter and DC calibrations
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Alicia Updates
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--------------
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- Made a start on the helicity analysis
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   - very preliminary plots without optimized cuts
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   - Already looks relatively promising, see spin asymmetries
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- To Do List:
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   - KaonLT data PID
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   - Background subtraction
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   - MM peak fitting/integration
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Next Week
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---------
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- PionLT will be first
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- GH will join from Vancouver before his flight to New Orleans
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- Stephen will be in-flight to DNP meeting
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Reminder about meeting time for Nov 9-Dec 21
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--------------------------------------------
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- Wednesdays at 7:15 Regina/8:15 Eastern
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- really apologize to those joining from California, but no other time worked
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  for everyone
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- will have a different poll for Jan-March, when people's teaching schedules
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  are different.  Hopefully we can find a later time in the day
(98-98/517)