[d2n-analysis-talk] Beta ~ 0 Events

[David Flay]

Hi Brad,

During the meeting yesterday you asked me about the percentage of beta ~ 0
events to the total event number.  I re-evaluated this ratio for all runs
(and binned by momentum) and the result is on the order of ~2.5% across
all momenta.  The errors on each momentum bin range from 0.05% at the
lowest p and up to 0.15% at the highest p.

The ratio was calculated as follows:

The baseline cut was good electrons (beta > -0.15, GC ADC, PR, T3, EDTM,
VDC, and target cuts on y, z, and dp).

I then obtain the number of events from this histogram. Call this quantity
(A).

Then, I impose the cut (beta > -0.15)&&(beta < 0) on top of the other cuts
already mentioned, and I obtain that number (B).

The ratio is computed as R = A/B, with its error E calculated as:

E = R*sqrt(1/A + 1/B).


-------------------------------------------------
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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