[Halld-tagger] [EXTERNAL] Photon Beam working group mtg today

[Richard Jones]

Dear Colleagues,

Please remember our biweekly Photon Beam working group meeting today,
starting at 1:30EDT on bluejeans, see link below. Today I plan to present
results from a study of Bethe Heitler pair production, comparing the UMass
generator output with my own Dirac++ library generator, and a generator
included in a recent release of G4, by Bernard. Of particular interest in
this study is the strong dependence of the analyzing power on the pair
mass, which depends in a sensitive way on the details of the generator
models.  Andrew has been looking at these samples as well, and may have
some updates to show.

I know that the Glasgow group is making progress on their CBSA
calculations. Other updates are welcome as well. Please update the agenda
as needed.

https://halldweb.jlab.org/wiki/index.php/BLTWG_Meeting_07/06/2021

-Richard Jones
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