[Gdh_lowq2] Abstract for PANIC 2011

[Marco Ripani]

Hi Sarah,
your abstract looks fine to me, except that I would modify one sentence 
as follows:
"the spin structure functions g1 and g2, fundamental spin observables 
which parameterize the way a polarized composite nucleon fragments into 
all possible final states". I think speaking in terms of deviation from 
point-like behavior recalls more the elastic form factors, rather than 
the inclusive structure functions.

Regards
Marco

Sarah Phillips wrote:
> Dear EG4 collaborators,
>
>        I would like to submit the following abstract for PANIC 2011 (see
> http://web.mit.edu/panic11/index.html).  Please let me know if you have
> comments.  The abstract deadline is tomorrow, so please do not delay in
> sending your comments!  I apologize for the last-minute nature of this
> request, and thank you for your time.
>
> With Regards,
>
> Sarah
>
>
>
> Nucleon Spin Structure and the JLab CLAS EG4 Experiment
>
>
> Our picture of the nucleon is not complete without a thorough
> understanding of the spin structure of the nucleon.  One way to access
> spin information is by measuring the spin structure functions g1 and g2,
> which are fundamental spin observables which characterize the deviation of
> the nucleon's spin-dependent properties from point-like behavior.
> Knowledge of g1 at low Q^2 would provide tests of chiral perturbation
> theory predictions in the resonance region.  However, data on g1 for the
> proton at very low Q^2 are lacking.  The CLAS EG4 experiment was performed
> at Jefferson Lab to determine the generalized GDH sum for the proton and
> the neutron at very low Q^2 from 0.015 to 0.5 (GeV/c)^2.   The experiment
> used Hall B's CLAS (CEBAF Large Acceptance Spectrometer) to perform a
> measurement of the helicity-dependent inclusive cross section differences
> for the scattering of polarized electrons from polarized protons and
> deuterons in solid polarized NH3 and ND3 targets.  From this absolute
> polarized cross section measurement, we will be able to extract the
> inclusive spin structure function g1 for the proton and the deuteron.  In
> addition to the spin structure functions that can be obtained from the
> inclusive measurement, the same data can be used to extract pion
> electroproduction asymmetries in the resonance region through the analysis
> of exclusive channels.  Upon completion of the analysis, the inclusive
> results will give a good test of chiral perturbation theory predictions.
> An overview of the EG4 experiment will be given, as well as preliminary
> results for the inclusive and exclusive analyses.
>
>
>
>
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>    

-- 

Marco Ripani
Senior Scientist, Istituto Nazionale di Fisica Nucleare - Genova
Address:
INFN
Via Dodecaneso 33
16146 GENOVA - ITALY
tel./fax 39-010-3536458
cell. 39-328-2191138
Jlab office room F244
tel. 1-757-269-7266  fax 1-757-269-6273
E-Mail: ripani at ge.infn.it