[Sane-analysis] e+/e-

[Peter Bosted]

Hi,
     In case you re interested, I've attatched the CLAS Analysis Note
for g1p, g1d from the 2009 eg1-dvcs experiment. In particular, there
is a discussion of e+/e- on pp. 37-40 or so. The curves used the
Wiser fits to make predictions. One thing I don't show is a
very rapid rise in e+/e- for theta>45 degrees (part A) or >47 degrees
(part B and C).: this was caused
by photons interacting in the nitrogen shield in the target.
    Peter


Prof. Peter Bosted
email: bosted at jlab.org
phone: (808) 315-1297 (cell)
P.O. Box 6254, Ocean View, HI 96737

On Thu, 16 Apr 2015, Whitney R. Armstrong wrote:

>
> Hello Everyone,
>
> Following the suggestion of Peter, I quickly analyzed a run for two good
> Cherenkov events that are well separated.
>
> As suspected, the number of event these events is *very* low compared to the
> single electron number.  My quick analysis  can be seen here
> http://quarks.temple.edu/~whit/SANE/analysis_main/plots/72949/two_cluster_pair_3.png
> which shows the energy distribution of the single track (black), and double
> cluster events (cluster1=red,cluster2=blue)
> Here you can see the separation of the double track events
> http://quarks.temple.edu/~whit/SANE/analysis_main/plots/72949/two_cluster_pair_2.png
> Likely these many of these events come from something like a noisy group of
> blocks.  Also, I have not even correlated with the lucite hodoscope which will
> only reduce their numbers. Note that I have a single track Cherenkov ADC window
> cut in order to remove the background from the front tracker.
>
> These results are  consistent with my statement that this type of event is
> heavily suppressed by kinematics and acceptance.
>
> Cheers,
> Whitney Armstrong
>
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