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Transverse force distributions in the proton from lattice QCD

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arxiv 2408.03621 v2 pith:O3SZEJSJ submitted 2024-08-07 hep-lat hep-phnucl-th

Transverse force distributions in the proton from lattice QCD

J. A. Crawford , K. U. Can , R. Horsley , P. E. L. Rakow , G. Schierholz , H. St\"uben , R. D. Young , J. M. Zanotti This is my paper
classification hep-lat hep-phnucl-th
keywords forcedistributionsasymmetrydeep-inelasticlatticepolarisedprotonquark
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Single-spin asymmetries observed in polarised 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 colour-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 polarised deep-inelastic scattering.

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  1. The color force acting on a quark in the pion and nucleon

    hep-ph 2025-11 unverdicted novelty 5.0

    In the instanton liquid model, the color force on a struck quark in the pion and nucleon is derived from twist-3 operators, related to gravitational and transversity form factors, and mapped in the transverse plane wi...