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Updated: May 23, 2025

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Transverse Force Distributions in the Proton from Lattice QCD
J A Crawford1, K U Can1, R Horsley2
1The University of Adelaide, CSSM, Department of Physics, Adelaide SA, 5005, Australia.
Abstract:
Single-spin asymmetries observed in polarized deep-inelastic scattering are important probes of hadron structure. The Sivers asymmetry has been the focus of much attention in QCD phenomenology and is yet to be understood at the quark level. In this Letter, we present a lattice QCD calculation of the spatial distribution of a color-Lorentz force acting on the struck quark in a proton. We determine a spin-independent confining force, as well as spin-dependent force distributions with local forces on the order of 3 GeV/fm. These distributions offer a complementary picture of the Sivers asymmetry in transversely polarized deep-inelastic scattering.
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