2003/04/23 by N. I. Kochelev · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Factor (programming language) #Form factor (electronics) #Instanton #Lattice QCD #Particle physics #Particle physics theoretical and experimental studies #Pauli exclusion principle #Physics #QCD vacuum #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum electrodynamics #Quantum mechanics #Quark #hep-ph
paper · pdf · doi:10.1016/s0370-2693(03)00727-5
published as Phys.Lett. B565 (2003) 131-136 · 9 pages, 2 figures, Latex
arxiv created 2003/04/23 · openalex publication_date 2003/06/03 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The non-perturbative contribution to the Pauli form factor of the quark, F2(Q 2), is calculated within an instanton model for the QCD vacuum. It is shown that the instantons give a large negative contribution to the form factor. The interaction of photons with hadrons is one of the most powerful tools to investigate the structure of strong interactions. The electromagnetic form factors of hadrons are now widely discussed[1]. This increased interest in the electromagnetic form factors is related to the significant theoretical progress in understanding the connection between form factors and structure functions of hadrons through the generalized parton distributions (GPD) [2], and to the need to explain the new experimental data from Jefferson Lab [3] for the nucleon and pion form factors at large Q 2. One of the basic components of the calculation of the form factors within the constituent quark model are the electromagnetic form factors of quarks. It has been shown that the non elementarity of the constituent quarks plays a crucial role for the understanding of the parton distributions and form factors [4, 5]. Moreover quarks form factors have been instrumental in the investigation of the scaling violations in deep-inelastic scattering [6]. We should also mention that in order to explain the high twist effects in Drell-Yan processes [7], various perturbative and non-perturbative gluonic corrections to the photon-quark vertex must be taken into account [8]. The general formula for the photon-quark vertex is Γµ = F1(Q 2)γµ + iqνσµν