A Measurement of the Proton Spin Dependent Structure Function, $g_2$, at Low $Q^2$

ORAL

Abstract

Measurements of the nucleon spin-dependent structure functions have proven to be powerful tools in testing the validity of a number of effective theories of Quantum Chromodynamics. The neutron spin structure functions ($g_1^n$, $g_2^n$) and the proton spin structure function ($g^{p}_{1}$) have been measured to very high precision over a wide kinematic range. However, the proton structure function, $g^{p}_{2}$, remains largely unmeasured. The primary goal of JLab Hall A experiment E08-027 is to perform an inclusive measurement of the proton $g_2$ structure function in the low momentum transfer range of ($0.02 < Q^2 < 0.2 $GeV$^2$). The experiment will allow us to test the Burkhardt-Cottingham Sum Rule at low $Q^2$ as well as extract the longitudinal-transverse generalized spin polarizability and compare it to predictions made by Chiral Perturbation Theory. The experiment acquired data at Jefferson Lab in Hall A during March - May of 2012. The details of the experiment will be presented, along with online results and an overview of the analysis progress.

Authors

  • Toby Badman

    Univ of New Hampshire