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Dear EG4ers,<br>
<br>
I know this comes very (too?) late in the game, but do you think it
would be acceptable to submit the following abstract to the DNP Fall
meeting ( <a href="http://physics.ucr.edu/dnp2012/">http://physics.ucr.edu/dnp2012/</a>
) this year? Unfortunately the deadline is TODAY - so we either have
to submit it right away or the point will be moot.<br>
<br>
I realize that this is a bit of a gamble, since we don't have any
results YET. However, I do honestly believe that Krishna can have
something (very preliminary) ready in time for October 24. If he
can't go, I will be at the meeting anyway. Of course, if anyone else
wants to go, we can definitely discuss this AFTER today. For now, we
need to keep a place holder in the program if we want to present
anything.<br>
<br>
Please give us your feedback, comments, changes... ASAP. - Sebastian
(also for Krishna)<br>
<br>
----<br>
<br>
<p class="MsoNormal"><del cite="mailto:Sebastian%20Kuhn" datetime="2011-12-19T11:06"></del>Deuteron
Spin Structure function g1(x) at low Q2<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The spin structure function g1 and its moments
provide crucial information on the internal structure of the
nucleon. At low momentum transfer Q2, one can study the transition
from partonic (quark-gluon) to hadronic (nucleonic) degrees of
freedom and test effective theories based on QCD, for instance
Chiral Perturbation Theory (ChPT). As Q2 goes to zero, the first
moment of g1 is constrained by the GDH sum rule and its ChPT
extensions, which makes measurements of g1 in this region uniquely
interesting.<o:p></o:p></p>
As part of the
large program of spin structure function measurements with CLAS at
Jefferson Lab, the EG4 experiment measured the cross section
difference between electron beam and proton/deuteron target spins
parallel and antiparallel to each other (and the beam direction)
down to small scattering angles (approx. 7 degrees). From these
differences, g1 can be extracted, with minimal model
uncertainties, down to Q2 as low as 0.01 GeV2. We will give a
brief overview of the experiment and its analysis, and present
first preliminary results on the deuteron spin structure function
g1d.
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