[d2n-analysis-talk] PR E/p Cut Efficiency Problem Solved (corrected?)

[David Flay]

Hi all,

During our last meeting, I noted an issue with the p = 0.60 GeV kinematic
-- in particular, that the calculated E/p cut efficiencies in the PR were
not consistent in going from 4- to 5-pass data.

Upon closer look at my input files, and my macro that plots the data, I
noticed that the 4-pass data was <not> included in the plot (and hence, in
my talk)!

(Such issues of leaving out data has caused me to go back and litter my
code with flags that will kill the program if there is anything in the
slightest that is not right...)

Subsequently, I've gone back and put this data in, which gives the two
plots I've attached.  Indeed, the p = 0.60 GeV data is consistent across
both beam energies.  I do believe that the visible <slight> drop in
efficiency for both of these -- with respect to the other data sets -- is
due to the wider (larger width) electron distributions in E/p, in which
case, the lower efficiency does make sense, even with the background
correction.  Hence, it's tied to the resolution of the PR at this point.

Overall, I think the results of the study are pretty solid.

Any comments or concerns?  Thanks,

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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