[Gdh_lowq2] Abstract for Baryons 2016 talk

[burkert]

Hi Krishna,

Very nice abstract and well written. I have no other comments.

Volker

On 3/15/16 2:06 AM, Krishna Adhikari wrote:
> Dear all,
> Please find below the draft of the abstract for my Baryons 2016 
> (http://baryons2016.physics.fsu.edu/) talk. Please let me know if you 
> have comments or corrections.
>
> *New results on spin structure functions at very low momentum 
> transfers from Jefferson Lab*
>
> Several experiments in Jefferson Lab have collected a large amount of 
> data on the spin structure of nucleons using polarized electron beam 
> directed on various polarized targets (NH3and ND3, 3He). In these 
> double polarization experiments, either the double spin asymmetries 
> A||and A⊥or the polarized cross section differences Δσ||and Δσ⊥are 
> measured with an unprecedented precision over a wide kinematic range, 
> with 0.02 GeV2< Q2< 5.0 GeV2and 1.08 GeV < W < 3.0 GeV and from these 
> measurements, the spin structure functions and their moments are 
> extracted. These data help us shed more light on the nucleon spin 
> structure in the region of quark-confinement as well in the transition 
> region between hadronic and partonic degrees of freedom. With these 
> data, it is possible to put constraints on quark-hadron duality, test 
> pQCD predictions for the quark polarization at large x, and test 
> various predictions for moments of structure functions from sum rules 
> and QCD based effective theories such as Chiral Perturbation Theory 
> (χPT) as well as from phenomenological models. Additionally, these 
> data make it possible to perform more precise calculations of 
> higher-twist matrix elements in the framework of the Operator Product 
> Expansion. At very low momentum transfers (Q2→0), the first moment 
> (Γ1) of structure function /g/1is constrained by the GDH sum rule and 
> its /χ/PT extensions, which makes measurements of /g/1in this region 
> uniquely interesting. In this talk, I will present new results on spin 
> structure functions from various experiments at Jefferson Lab with an 
> emphasis on low Q2measurements. In particular, I will present new 
> results from the EG4 experiment with CLAS, which measured the double 
> polarized cross section difference on NH3 and ND3(with both electron 
> beam and targets longitudinally polarized) down to Q2= 0.02 GeV2.
>
> Thank you.
> With best regards,
> Krishna
>
>
>
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