<html><body>Hi Whit,<div><br></div><div>I suggest adding an explanation of what d2 is. See my add-on comments.</div><div><br></div><div>Z.-E.<br><div><div>On Feb 28, 2011, at 11:28 AM, Whitney R. Armstrong wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Here is an updated version. <br><br><a href="http://quarks.temple.edu/~whit/SANE/talks/WArmstrong_PANIC2011.pdf">http://quarks.temple.edu/~whit/SANE/talks/WArmstrong_PANIC2011.pdf</a><br><br><br><br>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 </blockquote>twist three<br><blockquote type="cite">matrix element $d_2^p $ (an integral of $g_1$ and $g_2$ weighted by $x^2$) is most sensitive. </blockquote><div><br></div>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). <br><blockquote type="cite">The data was taken 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 double spin asymmetries, $A_\parallel$ and $A_\perp$ were measured using the BETA (Big Electron Telescope Array) Detector. BETA consists of a scintillator hodoscope, gas Cherenkov, lucite hodoscope and a large array of lead glass detectors. We will discuss the analysis of BETA data in addition to the motivating physics of the proton's spin structure.<br> <br> _______________________________________________<br>Sane-analysis mailing list<br><a href="mailto:Sane-analysis@jlab.org">Sane-analysis@jlab.org</a><br>https://mailman.jlab.org/mailman/listinfo/sane-analysis</blockquote></div><br></div></body></html>