[Hps-analysis] more trident plots--superFiducial

[Graham, Mathew Thomas]

Hi All, 

I just wanted to post a few slides looking at tridents where both the electron & positron are outside of rows 1 & 2 of the ECal (what I’ve dubbed the “superFiducial” region).  I wanted to completely get rid of the discontinuity in the acceptance (particularly for electrons) because they cause some weird distributions and I think that was clouding the issue.  

The slides are here:

https://confluence.slac.stanford.edu/download/attachments/211800437/hps-tridents-superFiducial.pdf?version=1&modificationDate=1463238935000&api=v2 

Slide 1:  shows X vs Y of the clusters for trident leptons after the superFidicial cut
Slide 2:  shows track momentum (= energy) vs track angle in x (phi)…no more ridges, but you see data & MC look quite different for electrons (and less dramatically for positrons)
Slide 3:  projections of the track momenta overlaid with the full trident MC (with beam background overlaid); the electrons definitely look weird here but nothing really matches very well
Slide 4:  same plots as slide 3 but with a cut at ESum> 0.84 GeV; so here we have similar ESum distributions (some of the difference in the momenta for the  full ESum region is just because the parent ESum = E(electron)+E(positron) is so different)….but still the electron & positron distribution is different in MC and data; and is asymmetric in data. 
Slide 5:  data is same as slide 4, but now the MC is purely radiative events; don’t take this too seriously, but radiative-like events and BH-like events (not shown, MC statistics is very poor..but look more like full tridents) do look quite a bit different from each other.  

Anyway, still no answers…but if we aren’t getting things right in the golden region of the detector, something very very funny is going on.  

Thanks, Matt