[Sane-analysis] DNP abstract

[Whitney R. Armstrong]

Dear Collaborators,

I will submit the following abstract for the APS DNP fall meeting. Sorry for
the short notice.

Cheers,
Whitney Armstrong


The Spin Asymmetries of the Nucleon Experiment (SANE) measured the virtual
Compton scattering asymmetries, $A_1$ and $A_2$, which 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 of $g_1$
and $g_2$ weighted by $x^2$) is most sensitive. The quantity, $d_2$, 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). The data was taken at the Thomas
Jefferson Lab National Accelerator Facility's Hall C, using beam energies of
$4.7$ and $5.9~GeV$, probing the nucleon at scales from $Q^2$ equal to
$2.5~GeV^2$ up to $6.5~GeV^2$. 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 scintillator hodoscope, gas Cherenkov, lucite
hodoscope and a large array of lead glass detectors. We will discuss the
analysis of the BETA data in addition to the motivating physics of the
proton's spin structure.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailman.jlab.org/pipermail/sane-analysis/attachments/20110701/1c1685e3/attachment.html