Meson cloud contributions to baryon axial form factors

Abstract

The axial form factor as well as the axial charge of octet baryons are studied in the perturbative chiral quark model (PCQM) with the quark wave functions predetermined by fitting the theoretical results of the proton charge form factor to experimental data. The theoretical results are found, based on the predetermined quark wave functions, in good agreement with experimental data and lattice values. This may indicate that the electric charge and axial charge distributions of the constituent quarks are the same. The study reveals that the meson cloud plays an important role in the axial charge of octet baryons, contributing 30%-40% to the total values, and strange sea quarks have a considerable contribution to the axial charge of the $\Sigma$ and $\Xi$.

6 pages, 4 figures, 5 tables

References in corpus (11)

• Nucleon electromagnetic form factors
• First Calculation of Hyperon Axial Couplings from Lattice QCD
• Octet baryon electromagnetic form factors in nuclear medium
• Electromagnetic form factors of the baryon octet in the perturbative chiral quark model
• Nucleon Form Factors of the Isovector Axial-Vector Current: Situation of Experiments and Theory
• Axial charges of octet and decuplet baryons
• Covariant spectator quark model description of the ${\gamma }^{\ast }\Lambda \to {\Sigma }^0$ transition
• Hyperon Axial Charges in Two-Flavor Chiral Perturbation Theory
• Chiral Corrections and the Axial Charge of the Delta
• Isovector axial-vector form factors of octet baryons in QCD
• Dependence of nucleon properties on pseudoscalar meson masses

Cited by in corpus (2)

• Electromagnetic and Axial-Vector Form Factors of the Quarks and Nucleon
• Chiral extrapolation of nucleon axial charge $g_A$ in effective field theory