[Halld-pid-upgrade] Some plots on the N pho raw

[Michael Williams]

> 4. Still strange that N pho / event does not grow with the number of tracks hit the DIRC bottom half (data and sim agree here).

What is the full list of criteria used to select these events? 

If the photon is in the peak region, and you require detecting the proton, is it actually kinematically possible to have 2 real particles with p > 4 GeV on the same side of the detector? (That’s > 8 GeV just in these 2 tracks, so curious what your photon energy selection is.) 

I.e., are you just looking at cloned tracks? 

Mike