[Eg1_run] Abstract for APS April - Invited Talk

[nguler at jlab.org]

Dear ALL,
The second iteration of the abstract for APS is attached and printed below.
Please comment.. I tried to make word, latex and acrobat lovers all happy..
Please excuse the attachment crowd, all are the same..
Thanks, - NG


Spin structure functions of the proton and the neutron at low to moderate Q$^2$
Nevzat Guler (for CLAS Collaboration)}
April 14, 2013
The physics program at Jefferson Lab has collected a large amount of data on
the spin structure functions of the nucleon by using polarized electron beam
directed on polarized NH$_3$, ND$_3$ and $^3$He targets. In these experiments,
the virtual photon asymmetry $A_1$ and the spin structure function $g_1$ were
measured with an unprecedented precision in a large kinematic range of 0.01
GeV$^2$ $<$ Q$^2$ $<$ 6.0 GeV$^2$ and 1.08 GeV $< W <$ 3.0 GeV. The data helps
us to better understand the spin structure of the nucleon, especially in the
transition region between hadronic and quark-gluon degrees of freedom.
Therefore, it will be possible to put limits on the quark-hadron duality, test
the pQCD predictions for the quark polarization at large $x$, perform more
precise calculations of higher-twist matrix elements in the framework of the
Operator Product Expansion and get a glimpse of A1 in high x. In addition,
parameterizations of the world data on the asymmetries and the spin structure
functions are studied to create and refine the models on these quantities that
can be used in various applications.  Finally, the neutron spin structure
functions are extracted from the combined proton and deuteron data using a new
unfolding technique. This is the first representation of the neutron data in
the resonance region.
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