# 8th Workshop of the APS Topical Group on Hadronic Physics

10-12 April 2019
Denver, CO
US/Mountain timezone
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# Contribution invited talk

Denver, CO - Director's Row J

# The $g_2$ structure function and recent results from the SANE experiment

## Speakers

• Whitney ARMSTRONG

## Content

The Spin Asymmetries of the Nucleon Experiment (SANE) measured two double spin asymmetries using a polarized proton target and polarized electron beam at two beam energies, 4.7 GeV and 5.9 GeV. A large-acceptance open-configuration detector package identified scattered electrons at 40$^{\circ}$ and covered a wide range in Bjorken $x$ ($0.3 < x < 0.8$). Proportional to an average color Lorentz force, the twist-3 matrix element, $\tilde{d}_2^p$, was extracted from the measured asymmetries at $Q^2$ values ranging from 2.0 to 6.0 GeV$^2$. This talk will cover the status of the $g_2$ structure function and present the results for $\tilde{d}_2^p$ with a discussion of the puzzling scale dependence observed and future measurements.