Non-perturbative structure of the polarized nucleon sea

Abstract

We investigate the flavour and quark-antiquark structure of the polarized nucleon by calculating the parton distribution functions of the nucleon sea using the meson cloud model. We find that the SU(2) flavor symmetry in the light antiquark sea and quark-antiquark symmetry in the strange quark sea are broken, {\it i.e.} $Δ\ubar < Δ\dbar$ and $Δs < Δ\sbar$. The polarization of the strange sea is found to be positive, which is in contradiction to previous analyses. We predict a much larger quark-antiquark asymmetry in the polarized strange quark sea than that in the unpolarized strange quark sea. Our results for both polarized light quark sea and polarized strange quark sea are consistent with the recent HERMES data.

arXiv commentRevTex, 17 pages plus 8 PS figures

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Cited by in corpus (20)

• Extraction of Spin-Dependent Parton Densities and Their Uncertainties
• Quark helicity distributions in the nucleon for up, down, and strange quarks from semi--inclusive deep--inelastic scattering
• The Spin Structure of the Proton
• Flavor Structure of the Nucleon Sea
• Threshold Resummation for W-Boson Production at RHIC
• Polarized Antimatter in the Proton from Global QCD Analysis
• Strangeness asymmetry of the nucleon in the statistical parton model
• The Sea of Quarks and Antiquarks in the Nucleon: a Review
• Quark scalar, axial, and pseudoscalar charges in the Schwinger-Dyson formalism
• Quark sea asymmetries of the octet baryons
• Collinear parton distributions and the structure of the nucleon sea in a light-front meson-cloud model
• Intrinsic strange distributions in the nucleon from the light-cone models
• Can the meson cloud explain the nucleon strangeness?
• Nucleon structure functions and longitudinal spin asymmetries in the chiral quark constituent model
• Transverse Momentum and Transverse Momentum Distributions in the MIT Bag Model
• Quark flavor distribution functions for the octet baryons in the chiral quark constituent model
• The spin dependent structure functions of the nucleon
• Strange quark helicity in the proton from chiral effective theory
• Electromagnetic and Axial-Vector Form Factors of the Quarks and Nucleon
• Helicity-dependent distribution of strange quarks in the proton from nonlocal chiral effective theory