[Eg1_run] Talk at LANL for Interview

[nguler at jlab.org]

Dear EG1 and CSC members,
I am going to give a talk at LANL in two weeks for job interview. I am sending
the abstract of the talk (also see the attachment for pdf file). Since this is
not a conference or workshop, I am not sure if I need to inform CLAS Speakers'
Committee every time. Please let me now if this is a standard procedure.
Best Regards, - Nevzat


\begin{abstract}
Double spin asymmetries for the proton and the deuteron have been measured in
the EG1b experiment using the CLAS detector at Jefferson Lab. Longitudinally
polarized electrons at energies 1.6, 2.5, 4.2 and 5.7 GeV were scattered from
longitudinally polarized NH$_3$ and ND$_3$ targets. The double spin asymmetry
$A_{\|}$ has been extracted from these data as a function of $Q^2$ and $W$
with unprecedented precision. The virtual photon asymmetry $A_1$ and the spin
structure function $g_1$ can be calculated from these measurements by using
parameterizations to the world data for the virtual photon asymmetry $A_2$ and
the unpolarized structure functions $F_1$ and $R$. The large kinematic
coverage of the experiment (0.05 GeV$^2$ $<$ Q$^2$ $<$ 5.0 GeV$^2$ and 1.08
GeV $< W <$ 3.0 GeV) helps us to better understand the spin structure of the
nucleon, especially in the transition region between hadronic and quark-gluon
degrees of freedom. The results from EG1b combined with other experiments
provide a good description of the virtual photon asymmetries making their
parameterizations possible in a large kinematic range. In this talk, the
results on $A_1$, $g_1$ and the first moment $\Gamma_1^1$ of the deuteron will
be presented. The parametrization efforts on the asymmetries and the spin
structure functions will be discussed. The neutron spin structure function,
extracted from the combined proton and deuteron data, will be shown.
\end{abstract}
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