Revealing Color Forces with Transverse Polarized Electron Scattering

Abstract

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${}^2$. The data display the opposite sign compared to most quark models, including the lattice QCD result, and an apparently unexpected scale dependence. Furthermore when combined with the neutron data in the same $Q^2$ range the results suggest a flavor independent average color Lorentz force.

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Cited by in corpus (14)

• New insights on proton structure from lattice QCD: the twist-3 parton distribution function $g_T(x)$
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• Parton distribution functions beyond leading twist from lattice QCD: The $h_L(x)$ case
• QCD factorization for twist-three axial-vector parton quasidistributions
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