[d2n-analysis-talk] Hall A Annual Report 2012: A Possible Update? [To Be Submitted Tomorrow, Friday 12/14/12]

[David Flay]

Hi all,

I just wanted to let everyone know I am planning on submitting the
proposed update to Seamus by the end of the work day tomorrow (Friday,
12/14/12).  If anyone wanted to make any comments, below are the details:

The planned update is to the cross section plots (see attached), with the
following capiton:

Preliminary results for the unpolarized Born cross sectons, compared to P.
Bosted's F1F209 model~\cite{Bosted} for E = 4.73 GeV \SubFit{born_xs_4}
and 5.89 GeV \SubFig{born_xs_5}.  The error bars show the statistical
errors, while the bands show the in quadrature sum of systematic errors
from experimental cuts, radiative corrections and other uncertainties
\Sect{XSErr}, and errors due to the subtraction of background signals from
nitrogen scattering and positron production in scattering from
\HeliumThree.

The following paragraph will also be added, at the end of the systematic
error subsection:

The largest contribution to the systematic errors comes from the
uncertainty in
subtracting the background signals in scattering from nitrogen and pair
production in
scattering from \HeliumThree.  In particular, the positron background
contributes at a level of $\approx$ 2 nb/GeV/sr at the lowest bin in \Ep.
Adding these contributions in quadrature with the values listed in
\Table{SysErr} gives the error band shown in \Figure{BornXS}.

I just want to make sure that everyone is OK with these changes before I
submit.  Thank you again for your comments and suggestions during the
process!

Sincerely,

David

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