[d2n-analysis-talk] PANIC Abstract [Due Tuesday, March 1 2011]

[Zein-Eddine Meziani]

David,

Please find a slightly modified version of your abstract., I  am not  
sure whether it is too long since I don't know whether there is a  
limit in the number of words. Of course comments are welcome.
Zein-Eddine

The quantity $d_2$, known as the twist three matrix element, 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).   With its  
information encoded in both spin structure functions  $g_1$ and $g_2$  
in the quark valence region at large Bjorken x, this confining local  
force is a result of the remanent di-quark system attracting the  
struck quark. . While bag and soliton model calculations for the  
neutron $d_2$ are consistent with those of Lattice QCD, current  
experimental data differ by approximately two standard deviations from  
those theoretical results.

To address this issue,  experiment E06-014 was carried out from  
February to March of 2009 at Jefferson Lab.  It consisted of measuring  
double-spin asymmetries and the differential cross section in (DIS)   
via scattering a longitudinally polarized electron beam off  a  
longitudinally and transversely polarized He-3 target, allowing for  
the extraction of the neutron $d_2$. The experiment covered excitation  
energies in the resonance and DIS valence quark regions.

Preliminary He-3 asymmetries and cross sections will be presented for  
data with beam energies of 4.73 and 5.89 GeV.



On Feb 25, 2011, at 11:12 AM, David Flay wrote:

> Hi all,
>
> I was curious as to your opinion of my draft of my abstract for the  
> PANIC
> conference:
>
> title: Precision Measurement of the neutron d2: Probing the Lorentz  
> Color
> Force
>
> 	The quantity d2 is a measure of the Lorentz color force averaged  
> over the
> volume of the nucleon that ultimately yields
> insight into its spin structure.
>
> 	While bag and soliton model calculations for the neutron d2 are
> consistent with those of lattice QCD, current
> experimental data differ by approximately two standard deviations.
> Furthermore, large error bars of
> previous experiments affect the overall sign of d2n.  Therefore, its  
> sign
> and magnitude are still unclear.
> 	To address this issue, the experiment E06-014 was carried out from
> February to March of 2009 at Jefferson Lab.  It consisted of measuring
> double-spin asymmetries and the total cross section via scattering a
> longitudinally polarized
> electron beam off of a longitudinally or transversely polarized He-3
> target, allowing for the construction of the neutron d2.
>  The experiment covered excitation energies in the resonance and deep
> inelastic valence quark regions.
>
> 	Preliminary He-3 asymmetries and cross sections will be presented for
> data with beam energies of 4.73 and 5.89 GeV.
>
>
>
> Any suggestions are welcome and appreciated.
>
> Thanks,
>
> Dave
>
>
> -------------------------------------------------
> David Flay
> Physics Department
> Temple University
> Philadelphia, PA 19122
>
> office: Barton Hall, BA319
> phone: (215) 204-1331
>
> e-mail: flay at jlab.org
>            flay at temple.edu
>
> website: http://www.jlab.org/~flay
>              http://quarks.temple.edu
> -------------------------------------------------
>
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