Meson Cloud and SU(3) Symmetry Breaking in Parton Distributions

Abstract

We apply the Meson Cloud Model to the calculation of nonsinglet parton distributions in the nucleon sea, including the octet and the decuplet cloud baryon contributions. We give special attention to the differences between nonstrange and strange sea quarks, trying to identify possible sources of SU(3) flavor breaking. A analysis in terms of the $\kappa$ parameter is presented, and we find that the existing SU(3) flavor asymmetry in the nucleon sea can be quantitatively explained by the meson cloud. We also consider the ${\Sigma }^{+}$ baryon, finding similar conclusions.

17 pages, LaTeX, 8 figures in .ps files

References in corpus (3)

• Meson-baryon couplings and the $F/D$ ratio from QCD sum rules
• Update of MRST partons
• The flavour asymmetry and quark-antiquark asymmetry in the ${\Sigma }^{+}$-sea

Cited by in corpus (14)

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• Charm-quark production in deep-inelastic neutrino scattering at NNLO in QCD
• Nucleon sea in the effective chiral quark model
• Massive charged-current coefficient functions in deep-inelastic scattering at NNLO and impact on strange-quark distributions
• Sea flavor content of octet baryons and intrinsic five-quark Fock states
• Gluon saturation and Feynman scaling in leading neutron production
• Strange sea distributions of the nucleon
• Exclusive processes with a leading neutron in $ep$ collisions
• Does the $D^{-}/D^{+}$ production asymmetry decrease at large $x_F$?
• Can the meson cloud explain the nucleon strangeness?
• Physics of the Nucleon Sea Quark Distributions
• The strong vertices of charmed mesons $D$, $D^{\ast }$ and charmonia $J/\psi$, ${\eta }_c$
• The s-s(bar) asymmetry in nucleon and "NuTeV anomaly"
• Nucleon parton distributions from hadronic quantum fluctuations