Flavor Asymmetry of the Nucleon Sea and the Five-Quark Components of the Nucleons

Abstract

The existence of the five-quark Fock states for the intrinsic charm quark in the nucleons was suggested some time ago, but conclusive evidence is still lacking. We generalize the previous theoretical approach to the light-quark sector and study possible experimental signatures for such five-quark states. In particular, we compare the $\bar{d}-\bar{u}$ and $\bar{u}+\bar{d}-s-\bar{s}$ data with the calculations based on the five-quark Fock states. The qualitative agreement between the data and the calculations is interpreted as evidence for the existence of the intrinsic light-quark sea in the nucleons. The probabilities for the $|uudu\bar{u}>$ and $|uudd\bar{d}>$ Fock states are also extracted.

4 pages, 3 figures

References in corpus (4)

• Implications of CTEQ global analysis for collider observables
• The Charm Parton Content of the Nucleon
• Measurement of Parton Distributions of Strange Quarks in the Nucleon from Charged-Kaon Production in Deep-Inelastic Scattering on the Deuteron
• Statistical effect in the parton distribution functions of the nucleon

Cited by in corpus (13)

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• Measurement of the differential photon+ c-jet cross section and the ratio of differential photon+ c and photon+ b cross sections in proton-antiproton collisions at sqrt(s) = 1.96 TeV
• Dynamical parton distributions from DGLAP equations with nonlinear corrections
• Valence quark distributions of the proton from maximum entropy approach
• Constraining nucleon strangeness
• Flavor structure of the unpolarized and longitudinally-polarized sea-quark distributions in the nucleon
• Strange quark-antiquark asymmetry of nucleon sea from $\Lambda /\bar{\Lambda }$ polarization
• Improved determination of $\bar{d}(x)-\bar{u}(x)$ flavor asymmetry in the proton by BONuS experiment at JLAB and using an approach by Brodsky, Hoyer, Peterson, and Sakai
• The axial charges of proton within an extended chiral constituent quark model
• Baryons in the unquenched quark model
• Improved determination of strange distribution function from the global analysis using BHPS model