Gluonic Structure of the Constituent Quark

Abstract

Based on both the constituent quark picture and the instanton model for QCD vacuum, we calculate the unpolarized and polarized gluon distributions in the constituent quark and in the nucleon. Our approach consists of the two main steps. At the first step, we calculate the gluon distributions inside the constituent quark generated by the perturbative quark-gluon interaction, the non-perturbative quark-gluon interaction, and the non-perturbative quark-gluon-pion anomalous chromomagnetic interaction. The non-perturbative interactions are related to the existence of the instantons, strong topological fluctuations of gluon fields, in the QCD vacuum. At the second step, the convolution model is applied to derive the gluon distributions in the nucleon. A very important role of the pion field in producing the unpolarized and the polarized gluon distributions in the hadrons is discovered. We discuss a possible solution of the proton spin problem.

6 pages, 5 figures, references added, discussion extended

References in corpus (6)

• A first unbiased global determination of polarized PDFs and their uncertainties
• Evidence for polarization of gluons in the proton
• Dynamical parton distributions of the nucleon and very small-x physics
• Evidences for two scales in hadrons
• Glue drops inside hadrons
• Anomalous pion production induced by nontrivial topological structure of QCD vacuum

Cited by in corpus (7)

• Exclusive production of $\rho$ meson in gamma-proton collisions: $d\sigma /dt$ and the role of helicity flip processes
• The Pauli Form Factor of Quark and Nontrivial Topological Structure of the QCD
• Effect of meson cloud on the jet nuclear modification factor in $pA$ collisions
• Single-spin asymmetries in SIDIS induced by anomalous gluon-quark and photon-quark couplings
• Off forward non-SCHC contributions to exclusive vector quarkonium production from the "spin dependent BFKL Pomeron"
• Parton distributions and $\cos 2{\varphi }_h$ asymmetry induced by anomalous photon-quark coupling
• Instanton induced transverse single spin asymmetry for ${\pi }^0$ production in $pp$-scattering