[Sane-analysis] DNP abstract (again)

[Whitney R. Armstrong]

I am not sure if it was sent to everyone the first time (when I used the the
sane-analysis email).

Your comments are appreciated.

Cheers,
Whit

The Spin Asymmetries of the Nucleon Experiment (SANE) measured the virtual
Compton scattering asymmetries, $A_1$ and $A_2$, which allow to determine
the spin structure functions of the proton,  $g_1$ and $g_2$. The kinematics
for these measurements are in a range of Bjorken $x$, $0.3 < x < 0.8$, where
extraction of the twist three matrix element $d_2^p $ (an integral with
respect to $x$ of $2g_1+ 3g_2$ weighted by $x^2$) is most sensitive. The
observable, $d_2$, is a measure of the average restoring Lorentz color force
experienced by a quark inside a polarized nucleon after it is struck by a
virtual photon in electron Deep Inelastic Scattering (DIS)[1]. The data was
taken at the Thomas Jefferson  National Accelerator Facility's Hall C, using
beam energies of $4.7$ and $5.9~GeV$, probing the nucleon at scales ranging
from $Q^2 = 2.5~GeV^2$ up to $Q^2 = 6.5~GeV^2$.  In this polarized electron
scattering off a polarized proton target experiment two inclusive double
spin asymmetries, $A_\parallel$ and $A_\perp$ were measured using the BETA
(Big Electron Telescope Array) detector. BETA is a device without magnetic
momentum dispersion that consists of a front scintillator hodoscope followed
by a threshold gas Cherenkov counter, a lucite hodoscope and a large array
of lead glass detectors. In addition to motivating the physics of the
proton's spin structure we shall discuss the analysis of the BETA data and
present preliminary results.
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