Jefferson Lab has been at the forefront of a program to measure the nucleon spin-dependent structure functions over a wide kinematic range. Data of unprecedented quality has been extracted in all three experimental halls. Higher moments of these quantities have proven to be powerful tools to test QCD sum rules and will provide benchmark tests of Lattice QCD and Chiral Perturbation Theory. Precision measurements of gn1,2 and gp1 have been performed as part of the highly successful 'extended GDH program', but measurements of the proton's transverse spin structure function, gp2, remain scarce.
E08-027 will measure g2 for a polarized proton target at the lowest possible Q-squared. This will help to clarify several outstanding physics puzzles. For more details, please check our PROPOSAL. A public-friendly description of the experiment can be found here.
The old g2p website can be found at the following link.