[Hps-analysis] Moller Gap Update

[Bradley T Yale]

Here is the data for comparison, same SVT cut.

There are more hits away from the corner, and so no gap in the energy.

________________________________
From: Hps-analysis <hps-analysis-bounces at jlab.org> on behalf of Bradley T Yale <btu29 at wildcats.unh.edu>
Sent: Friday, April 15, 2016 3:33 PM
To: hps-analysis at jlab.org; Valery Kubarovsky
Subject: [Hps-analysis] Moller Gap Update


I think I may have found the cause as to what is causing that dip in the 2.3 GeV Moller track energy after recon:

Not the generator. Pure geometric acceptance.


Plots 1-2: 1.056 GeV MC is suspiciously free of dips after recon, and the hot ECal hits are all above the electron hole.

This is using the old generator by the way.


Plots 3-4: These are only the Mollers which had that strange "gap" in layer 5 SVT hits (-9 to -13 mm). The final plot shows the gap.

Notice where they land on the ECal.


So it seems that the corner of the electron hole happens to be where electrons with exactly half the beam energy go for 2.3 GeV...


-Brad
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