Speaker
Description
Experiment E12-06-121 at Jefferson Lab aims to do a precision measurement of the neutron spin structure function g2 using inclusive inelastic scattering of electrons over a large kinematic range of xBj and Q2. The third moment of the linear combination of the spin structure functions g1 and g2, d2, is one of the cleanest higher twist observables and contains information on the quark-gluon correlations. It is connected to the “color polarizability” or "color Lorentz force" of the nucleon. The experiment was performed and successfully completed in Hall C using a longitudinally polarized 10.4 GeV electron beam, and a polarized helium-3 gas target. The combination of Super High Momentum Spectrometer (SHMS) and High Momentum Spectrometer (HMS) allowed us to run the experiment for three constant Q2 values (3, 4.3, and 5.6 GeV2/c2) over a wide range of xBj (0.20 < xBj < 0.95) for the first time. The extraction of d2n (Q2 ) will serve as a benchmark for the predictions from Lattice QCD. An overview of the experiment and the present status of the experimental data analysis will be presented.
1 This work is partially supported by the U.S. Department of Energy Office of Nuclear Physics under Contract No. DEFG02-99ER41101.
| Submitted on behalf of a Collaboration? | Yes |
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