[Sane-analysis] PANIC Abstract update

[Zein-Eddine Meziani]

Hi Whit,

I suggest adding an explanation of what d2 is. See my add-on comments.

Z.-E.
On Feb 28, 2011, at 11:28 AM, Whitney R. Armstrong wrote:

> Here is an updated version.
>
> http://quarks.temple.edu/~whit/SANE/talks/WArmstrong_PANIC2011.pdf
>
>
>
> 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 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.
>
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