Electromagnetic and Axial-Vector Form Factors of the Quarks and Nucleon

Abstract

In light of the improved precision of the experimental measurements and enormous theoretical progress, the nucleon form factors have been evaluated with an aim to understand how the static properties and dynamical behavior of nucleons emerge from the theory of strong interactions between quarks. We have analysed the vector and axial-vector nucleon form factors ($G_{E,M}^{p,n}(Q^2)$ and $G_A^{p,n}(Q^2)$) using the spin observables in the chiral constituent quark model ($\chi$CQM) which has made a significant contribution to the unraveling of the internal structure of the nucleon in the nonperturbative regime. We have also presented a comprehensive analysis of the flavor decomposition of the form factors ($G_E^q(Q^2)$, $G_M^q(Q^2)$ and $G_A^q(Q^2)$for $q=u,d,s$) within the framework of $\chi$CQM with emphasis on the extraction of the strangeness form factors which are fundamental to determine the spin structure and test the chiral symmetry breaking effects in the nucleon. The $Q^2$ dependence of the vector and axial-vector form factors of the nucleon has been studied using the conventional dipole form of parametrization. The results are in agreement with the available experimental data.

26 pages, 11 figures. arXiv admin note: text overlap with arXiv:1606.06441, arXiv:1505.03304

References in corpus (18)

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• Measurement of the proton electric to magnetic form factor ratio from \vec ^1H(\vec e, e'p)
• Polarization Transfer in the 4He(e,e'p)3H Reaction at Q^2 = 0.8 and 1.3 (GeV/c)^2
• Proton G_E/G_M from beam-target asymmetry
• Spin 1/2^+, spin 3/2^+ and transition magnetic moments of low lying and charmed baryons
• Extraction of the Neutron Magnetic Form Factor from Quasi-Elastic 3He(pol)(e(pol),e') at Q^2 = 0.1 - 0.6 (GeV/c)^2
• Flavor Structure of the Nucleon Sea
• Determination of the strange form factors of the nucleon from $\nu p$, $\bar{\nu }p$, and parity-violating $\vec{e}p$ elastic scattering
• Statistical effect in the parton distribution functions of the nucleon
• Quark asymmetries in the proton from a model for parton densities
• Spin and Flavor Strange Quark Content of the Nucleon
• Generalized parton distributions in a meson cloud model
• Axial-vector form factors for the low lying octet baryons in the chiral quark constituent model
• Quadrupole moments of low lying baryons with spin 1/2^+, spin 3/2^+, and spin 3/2^+ \to 1/2^+ transitions
• Sea quark contents of octet baryons
• Meson cloud contributions to baryon axial form factors
• Unravelling the physical meaning of the Jaffe-Manohar decomposition of the nucleon spin
• Quark flavor distribution functions for the octet baryons in the chiral quark constituent model