Spin Studies of Nucleons in a Statistical Model

Abstract

We decompose various quark-gluon Fock states of a nucleon in a set of states in which each of the three-quark core and the rest of the stuff, termed as a sea, appears with definite spin and color quantum number, their weight being determined, statistically, from their multiplicities. The expansion coefficients in the quark-gluon Fock states have been taken from a recently proposed statistical model. We have also considered two modifications of this model with a view to reduce the contributions of the sea components with higher multiplicities. With certain approximations, we have calculated the quark contributions to the spin of the nucleon,the ratio of the magnetic moments of nucleons, their weak decay constant, and the ratio of SU(3) reduced matrix elements for the axial current. A reasonably close agreement with the corresponding experimental values have been obtained in all the three cases.

19 pages

References in corpus (20)

• Measurements of the Proton and Deuteron Spin Structure Functions g1 and g2
• Nucleon Parton Distributions at Low Normalization Point in the Large N_c Limit
• Saturation and Universality in QCD at small x
• The Quark/Antiquark Asymmetry of the Nucleon Sea
• Determination of ${\alpha }_s$ and the Nucleon Spin Decomposition Using Recent Polarized Structure Function Data
• A statistical approach for polarized parton distributions
• Two-gluon form factor of the nucleon and $J/\psi$ photoproduction
• Wavefunction-Independent Relations between the Nucleon Axial-Coupling g_A and the Nucleon Magnetic Moments
• Evidence for Colour-Octet Mechanism from CERN LEP2 gamma gamma -> J/psi + X Data
• The Proton Spin and the Wigner Rotation
• A Phenomenological Analysis of Gluon Mass Effects in Inclusive Radiative Decays of the $J/\psi$ and $Υ
• Chiral Symmetry and the Nucleon Structure Functions
• Infrared behavior of the running coupling constant and bound states in QCD
• Phenomenological quark model for baryon magnetic moments and beta decay ratios ($G_A/G_V$)
• Detailed Balance and Sea-Quark Flavor Asymmetry of Proton
• Principle of Balance and the Sea Content of the Proton
• Is nucleon spin structure inconsistent with constituent quark model?
• Sea Contributions and Nucleon Structure
• The Spin Structure of the Proton in a Non-relativistic Quark Model
• Semileptonic decays, magnetic moments and spin distributions of spin-1/2 baryons with sea contribution

Cited by in corpus (14)

• Nuclear EMC Effect in a Statistical Model
• Sea quark contents of octet baryons
• Magnetic moments of JP = 3/2+ decuplet baryons using statistical model
• Properties of JP = 1/2+ baryon octets at low energy
• Sea Quark Flavor Asymmetry of Hadrons in Statistical Balance Model
• Importance of Sea Contribution to Nucleons
• Strange Mass Corrections to Hyperonic Semi-leptonic Decay in Statistical Model
• Strange and nonstrange sea quark-gluon effects in nucleons
• Detailed Balance and Spin Content of Λ using Statistical Model
• J/P=1/2+, J/P=3/2+ masses in statistical model
• Sea Quark and Gluon contributions to Strange Baryons and their Properties
• Sea contribution to the charge radii and quadrupole moment of $J^P={\frac{1}{2}}^{+},{\frac{3}{2}}^{+}$ baryons
• Octet Quark Contents from SU(3) Flavor Symmetry
• Parton distribution functions and nuclear EMC effect in a statistical model