[Hps] [EXTERNAL] Winter 2026 HPS Analysis Workshop January 27-28

[Graham, Mathew Thomas]

Hi All,

Per the when-to-meet poll, it looks like Tuesday and Wednesday, January 27-28 are the best days for the most people for our analysis meeting.  Unless there are any late objections, this is when we will meet.  I'm thinking we will run 9am-2pm with an hour for lunch....good?

Here's a loose outline? Points we should be thinking about?  Whatever...let me know what you think and if I missed anything.

Thanks, Matt



  *
how does pass5_v9 data look?
     *
Any weird stuff
     *
Look at High and low pSum vertex/y0min tails
     *
Is there a way to speed up production?
  *
data/MC shape and rate comparisons with & without killing/tweaking
     *
Is our MC good enough?
     *
Do the rates make sense? Relative rates for different layers-hit categories?
  *
momentum, angle and mass calibration & smearing
     *
FEEs  ...
     *
Mollers (is the scaling to 3.7 GeV simple?)
        *
How much extra, post recon, smearing do we need?
     *
Three-prongs
        *
How do we use this?  Use pSum as crosscheck of MC+post-recon smearing?
        *
We should be able to use vertex+kinematic constrained fit (constrain total 3-momentum to beam and vertex to target+beamspot xy) to get momentum & angular track resolutions but this was tried way back when and didn't work?
     *
Are phi0's a possibility?
  *
Planning for analysis
     *
Scope of each analysis (high-pSum, low-pSum, bumphunt)
        *
I think we agreed to just use L1L1...do we understand efficiency?
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Getting to tight cuts
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Preselection is in good shape...should we decide to freeze it?
        *
Vertex-Z vs y0min vs MVA?  How to get to a decision?
     *
Background estimates, signal extraction & limit setting
        *
It's possible we are not really in the low-background regime anymore...time for an ML fit for the vertexing analyses?
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Including recoil electron information in selection (reconstruction?)
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Who does what
  *
discussion of systematic uncertainties
     *
Everyone hates these...
  *
Updating software packages (SLAC/sdf-centric)



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