[Gdh_lowq2] URGENT! APS abstract !?!

[Sebastian Kuhn]

Dear EG4ers,

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 ( http://physics.ucr.edu/dnp2012/ ) this year? Unfortunately the 
deadline is TODAY - so we either have to submit it right away or the 
point will be moot.

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.

Please give us your feedback, comments, changes... ASAP. - Sebastian 
(also for Krishna)

----

Deuteron Spin Structure function g1(x) at low Q2

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.

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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