2006/06/30 by І. О. Чередніков, I. O. Cherednikov, U. D’Alesio +3 · 1 citation
Physics and Astronomy · #Gluon #High-Energy Particle Collisions Research #Instanton #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Valence (chemistry) #Wave function #hep-ph
paper · pdf · doi:10.1016/j.physletb.2006.09.019
published as Phys.Lett.B642:39-47,2006 · 1+12 pages, 4 ps figures; v2: few references and one sentence added in the introduction; final version published in Phys. Lett. B
openalex publication_date 2006/09/28 · arxiv created 2006/10/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the Sivers function for valence u and d quarks in the proton within the instanton model for QCD vacuum, adopting the MIT bag model wave functions for quarks. Within approaches based on perturbative one-gluon final state interactions a non-zero value of the Sivers function is related to the presence of both S and P wave components in quark wave functions. We show that the instanton-induced chromomagnetic, nonperturbative interaction leads to very specific spin-spin correlations between the struck and spectator quarks, resulting in a non-trivial flavour dependence of the Sivers function. Comparison of the obtained Sivers functions with phenomenological parameterizations is discussed.