2017/09/30 by Xu Cao, Nikolai Korchagin, N. I. Kochelev +2
Physics and Astronomy · #Bottom quark #Deep inelastic scattering #Diquark #Gluon #Helicity #High-Energy Particle Collisions Research #Inelastic scattering #Instanton #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Scattering #Top quark #Top quark condensate #hep-ph
paper · pdf · doi:10.1103/physrevd.96.114010
published as Phys. Rev. D 96, 114010 (2017) · 17 pages, 4 figures, published version
openalex created_date 2017/10/06 · openalex publication_date 2017/12/13 · arxiv created 2017/12/14 · arxiv updated 2017/12/20 · openalex updated_date 2026/08/05
We calculate the contribution of the nonperturbative Pauli couplings in the quark-photon and quark-gluon vertices to the single-spin asymmetries (SSAs) in semi-inclusive deep inelastic scattering (SIDIS). We describe the nucleon using the spectator model with scalar and axial-vector diquarks. Both of the new couplings can cause the helicity flip of the struck quark. The helicity flip and the rescattering induced by the nonperturbative gluon exchange between the struck quark and diquark lead to the SSAs. Their azimuthal dependencies are the same as that usually ascribed to the Collins and Sivers effects. Our numerical results, based on the instanton model for the QCD vacuum, show that the nonperturbative quark-gluon and quark-photon interactions have a strong influence on these asymmetries.