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

[David Flay]

Revised version:

   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 remnant 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, 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 d_2. The
experiment covered excitation energies in the resonance and DIS valence
quark regions.

Preliminary results concerning the asymmetries and cross sections will be
presented.



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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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