Lattice QCD computes the transverse spatial distribution of the colour-Lorentz force on the struck quark in a proton, finding local forces up to about 3 GeV/fm, larger than the QCD string tension.
HERMES measurements of Collins and Sivers asymmetries from a transversely polarised hydrogen target
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abstract
Azimuthal single-spin asymmetries (SSA) in semi-inclusive electroproduction of pi-mesons and charged K-mesons in deep-inelastic scattering of positrons and electrons on a transversely polarised hydrogen target were observed. Significant SSA amplitudes for both the Collins and the Sivers mechanism are presented for the full data set recorded with transverse target polarisation at the HERMES experiment.
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Transverse force distributions in the proton from lattice QCD
Lattice QCD computes the transverse spatial distribution of the colour-Lorentz force on the struck quark in a proton, finding local forces up to about 3 GeV/fm, larger than the QCD string tension.