The axial charges of proton within an extended chiral constituent quark model

Abstract

We have performed a study of the isovector, octet and singlet axial charges of the proton in an extended chiral constituent quark model, where all the possible $uudq\bar{q}$~($q=u,d,s$) five-quark Fock components in the proton wave function are taken into account. The ${}^3{P}_0$ quark-antiquark creation mechanism is assumed to account for the transition coupling between three- and five-quark components in proton, and the corresponding transition coupling strength is fixed by fitting the intrinsic sea flavor asymmetry $\bar{d}-\bar{u}$ data for proton. Accordingly, with all the parameters fixed by empirical values, the probabilities of the intrinsic five-quark Fock components in proton wave function should be $\sim 30-50\%$, which lead to the numerical results for quark spin $\Delta u$, $\Delta d$ and $\Delta s$, as well the axial charges of proton consistent with the experimental data and predictions by other theoretical approaches.

arXiv comment9 pages, 4 tables

References in corpus (39)

• Gauge-Invariant Decomposition of Nucleon Spin and Its Spin-Off
• The Spectrum of the Nucleons and the Strange Hyperons and Chiral Dynamics
• The Spin Structure of the Nucleon
• Improved Measurement of the $\bar{d}/\bar{u}$ Asymmetry in the Nucleon Sea
• The angular momentum controversy: What's it all about and does it matter?
• Nucleon Generalized Parton Distributions from Full Lattice QCD
• The Deuteron Spin-dependent Structure Function g1d and its First Moment
• Measurements of the $Q^2$-Dependence of the Proton and Neutron Spin Structure Functions g1p and g1n
• The Flavor Asymmetry of the Light Quark Sea from Semi-inclusive Deep-inelastic Scattering
• The Spin-dependent Structure Function of the Proton g_1^p and a Test of the Bjorken Sum Rule
• Spin Structure of the Nucleon - Status and Recent Results
• Complete flavor decomposition of the spin and momentum fraction of the proton using lattice QCD simulations at physical pion mass
• The nucleon spin and momentum decomposition using lattice QCD simulations
• The Spin Structure of the Nucleon
• Interplay of Spin and Orbital Angular Momentum in the Proton
• Nucleon charges with dynamical overlap fermions
• Strangeness Contribution to the Proton Spin from Lattice QCD
• The Asymmetry of Antimatter in the Proton
• Up, down, and strange nucleon axial form factors from lattice QCD
• The $s\bar{s}$ component of the proton and the strangeness magnetic moment
• Is gauge-invariant complete decomposition of the nucleon spin possible ?
• Glue spin and helicity in proton from lattice QCD
• Tensor Charge of the Nucleon in Lattice QCD
• Resolution of the Proton Spin Problem
• The nucleon's octet axial-charge g_A^8 with chiral corrections
• Flavor Asymmetry of the Nucleon Sea and the Five-Quark Components of the Nucleons
• Flavor Structure of the Nucleon Sea
• Strangeness spin, magnetic moment and strangeness configurations of the proton
• The role of the $qqqq\bar{q}$ components in the electromagnetic transition ${\gamma }^{\ast }N\to N^{\ast }(1535)$
• The Parton Orbital Angular Momentum: Status and Prospects
• The role of $q\bar{q}$ components in the N(1440) resonance
• Two-component model for the axial form factor of the nucleon
• Strong decay of low-lying $S_{11}$ and $D_{13}$ nucleon resonances to pseudoscalar mesons and octet baryons
• Five-quark components in $\Delta (1232)\to N\pi$ decay
• Sea flavor content of octet baryons and intrinsic five-quark Fock states
• The spin of the proton in chiral effective field theory
• Strangeness Suppression in q-qbar Creation Observed in Exclusive Reactions
• Strange quark helicity in the proton from chiral effective theory
• Orbital angular momentum of the proton and intrinsic five-quark Fock states

Cited by in corpus (4)

• Investigations on the flavor-dependent axial charges of the octet baryons
• Constituent quark axial current couplings to light vector mesons in the vacuum and with a weak magnetic field
• Flavor asymmetry from the non-perturbative nucleon sea
• The quark orbital angular momentum of ground state octet baryons