[d2n-analysis-talk] z_react Check Via Focal Plane Cuts

[David Flay]

Hi all,

Attached are a few plots to test our optics after implementing
Transversity's matrix elements and the offset I applied.

I plot the focal plane (plot 1 -- S1 track x vs. S1 track y) and I divided
it up into 9 regions (plot 2).  Then, I plotted z_react with basic trigger
cuts, along with the nominal positions (vertical red lines) and overlayed
z_react subject to each of the 9 different cut regions (plot 3).

You will notice that the middle three regions line up very nicely w.r.t.
the nominal positions.  The edge regions (in particular, the left side)
have an offset to them, if you look closely (most visible under the
central peak).  Due to this, I think it's necessary to take a look at
Transversity sieve data and see how our DB can reconstruct the sieve. I'd
also like to compare our z_react widths to that of Transversity's.

The cut regions are not all of equal size, but I think it's still a fair
test to see how things look -- since an arbitrary cut region should
ideally reveal a nicely reconstructed vertex.

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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