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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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- 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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- 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
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