Thanks for your comments. I see that there was some cyber attack or something... I could not ssh the lab. Anyway... <br><br>Here is an updated version.<br><br>The Spin Asymmetries of the Nucleon Experiment (SANE) measured the virtual Compton scattering asymmetries, $A_1$ and $A_2$, which allows for a direct measurement of 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 $A_{80}$ ($\simeq A_\perp$) 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.<br>
<br>[1] M. Burkardt, AIP Conf. Proc. 1149, 62 (2009) [arXiv:0902.0163 [hep-ph]].<br><br><div class="gmail_quote">On Fri, Jul 1, 2011 at 2:02 PM, O. A. Rondon <<a href="mailto:or@virginia.edu">or@virginia.edu</a>> wrote:<br>
<blockquote class="gmail_quote">
Hi Whit,<br><br>
Most group members probably did not get your first message. I think<br>
there was a problem with JLab e-mail last night.<br><br>
The abstract looks good. One comment would be that since g1 and g2 can<br>
also be measured directly, I suggest wording it so it does not sound<br>
like one needs to measure A1 and A2 first, it is just how we did it. And<br>
what we actually measured are A_para and A_80.<br><br>
There is also a reference [1] in the text that is not shown at the end.<br>
Probably is should just be deleted.<br><br>
Cheers,<br><br>
Oscar<br><br>
</blockquote></div><br>