[Hps-analysis] Moller Gap Update

[Nathan Baltzell]

Or from the opposite direction:  do you have good requirements on cluster-track
matching in the real data?  If this MC is from a purely Moller event generator
(no beam backgrounds to trigger on accidentals), then just poor cluster-track
matching for the data could explain the data/MC discrepancy.

-nathan


On Apr 15, 2016, at 16:00, Nathan Baltzell <baltzell at jlab.org> wrote:

> So it is due to ecal acceptance?  Then is it possible to replot
> reconstructed mc without ecal (trigger) requirements?
> 
> 
> 
> 
> On Apr 15, 2016, at 15:41, Bradley T Yale <btu29 at wildcats.unh.edu> wrote:
> 
>> 
>> 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
>> <neg_hits.png><TRACK_Energy.png><WTF_gap.png><GapTrackE.png>_______________________________________________
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> 
> 
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