Nucleon sea in the effective chiral quark model

Abstract

The asymmetries of both light-flavor antiquark $\bar{d}(x)-\bar{u}(x)$ and strange-antistrange $s(x)-\bar{s}(x)$ distributions of the nucleon sea are considered with more details in the effective chiral quark model. We find that the asymmetric distribution of light-flavor antiquarks $\bar{d}(x)-\bar{u}(x)$ matches the experiment data well and that the asymmetry of strange and antistrange distributions can bring about 60-100% correction to the NuTeV anomaly of ${\sin }^2{\theta }_w$, which are three standard deviations from the world average value measured in other electroweak processes. The results on the correction to the NuTeV anomaly are insensitive to the inputs of the constituent quark distributions and the cut-off parameters. The ratios of $\bar{d}(x)/\bar{u}(x)$ and $s(x)/\bar{s}(x)$ are also discussed, and it is found that the ratio $s(x)/\bar{s}(x)$ is compatible with the available experiments with an additional symmetric sea contribution being considered effectively.

24 Latex pages, 8 figures

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• Flavor Structure of the Nucleon Sea
• Electroweak higher-order effects and theoretical uncertainties in deep-inelastic neutrino scattering
• Statistical effect in the parton distribution functions of the nucleon
• A Possible Resolution of the Strange Quark Polarization Puzzle ?
• Sea quark contents of octet baryons
• Light flavor asymmetry of nucleon sea
• Quark sea asymmetries of the octet baryons
• The CDF dijet excess from intrinsic quarks
• Influence of Heavy Quark Recombination on the Nucleon Strangeness Asymmetry
• Nucleon structure functions and longitudinal spin asymmetries in the chiral quark constituent model
• Nucleon strange $s\bar{s}$ asymmetry to the $\Lambda /\bar{\Lambda }$ fragmentation
• Probing nucleon strange asymmetry from charm production in neutrino deep inelastic scattering
• Spin transfer and polarization of antihyperons in lepton induced reactions
• Quark flavor distribution functions for the octet baryons in the chiral quark constituent model
• Strange quark-antiquark asymmetry of nucleon sea from $\Lambda /\bar{\Lambda }$ polarization
• Nucleon strangeness polarization from $\Lambda /\bar{\Lambda }$ hyperon production in polarized proton-proton collision at RHIC
• The leading particle effect from light quark fragmentation in charm hadroproduction
• Isospin Symmetry Breaking in the Chiral Quark Model
• Electromagnetic and Axial-Vector Form Factors of the Quarks and Nucleon
• Phenomenological analysis of nucleon strangeness and meson-nucleon sigma terms
• Proton spin in a light-cone chiral quark model
• Effect due to charge symmetry violation on the Paschos-Wolfenstein relation
• NuTeV Anomaly Versus Strange-Antistrange Asymmetry
• Quark-antiquark asymmetry of helicity distributions in the nucleon sea
• The influence of direct $D$-meson production to the determination on the nucleon strangeness asymmetry via dimuon events in neutrino experiments