[d2n-analysis-talk] T3 Trigger Efficiency (Preliminary) Results

[David Flay]

Hi all,

In light of my previous comments yesterday concerning the behavior of the
PID cuts, I've plotted the T3 trigger efficiency as a function of run
number -- see the attached plot.

216 production runs were evaluated.  This plot shows all inelastic runs --
I've left off the elastic 3He because those run numbers were 1229,1230 --
they didn't fit on the plot (unless someone knows how to 'skip' certain
regions on the x-axis -- that is, have a range that can nicely fit 1200 -
1240, ..., 20180 - 20740 on the same plot with no empty space in between.
ROOT doesn't know what I'm talking about.  Maybe I'm not using the proper
terminology?)

In any case, the average T3 trigger efficiency comes out to ~99.95%

One may compare these results to Patricia's:

http://hallaweb.jlab.org/experiment/E01-012/reports/trig_vdc.pdf (page 8)

The average agrees with Patricia's, but the overall trend of my plot is a
bit more spread out.

I do believe that the large number of runs for which we have 100%
efficiency is an artifact of statistics (see previous discussion).

Dave


-------------------------------------------------
David Flay
Physics Department
Temple University
Philadelphia, PA 19122

office: Barton Hall, BA319
phone: (215) 204-1331

e-mail: flay at jlab.org
            flay at temple.edu

website: http://www.jlab.org/~flay
              http://quarks.temple.edu
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