Quark asymmetries in the proton from a model for parton densities

Abstract

Based on quantum fluctuations in momentum and of the proton into meson-baryon pairs, we develop a physical model for the non-perturbative x-shape of parton density functions in the proton. The model describes the proton structure function and gives a natural explanation of observed quark asymmetries, such as the difference between the anti-up and anti-down sea quark distributions and between the up and down valence distributions. An asymmetry in the momentum distribution of strange and anti-strange quarks in the nucleon is found to reduce the NuTeV anomaly to a level which does not give a significant indication of physics beyond the standard model.

arXiv comment27 pages, 11 figures. Updated with extended discussion

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Cited by in corpus (20)

• Light-Cone Models for Intrinsic Charm and Bottom
• Leading and Next-to-Leading Order Gluon Polarisation in the Nucleon and Longitudinal Double Spin Asymmetries from Open Charm Muoproduction
• Flavor Structure of the Nucleon Sea
• Parton-distribution functions for the pion and kaon in the gauge-invariant nonlocal chiral-quark model
• Electromagnetic structure functions and neutrino nucleon scattering
• Nucleon Quark Distribution Functions from the Dyson-Schwinger Equations
• Sea flavor content of octet baryons and intrinsic five-quark Fock states
• $x-$dependence of the quark distribution functions in the $\chi$CQM${}_{\mathrm{config}}$
• Quark sea asymmetries of the octet baryons
• Perturbative and nonperturbative contributions to the strange quark asymmetry in the nucleon
• Nucleon structure functions and longitudinal spin asymmetries in the chiral quark constituent model
• Quark flavor distribution functions for the octet baryons in the chiral quark constituent model
• Nucleon strangeness polarization from $\Lambda /\bar{\Lambda }$ hyperon production in polarized proton-proton collision at RHIC
• Electromagnetic and Axial-Vector Form Factors of the Quarks and Nucleon
• 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 small $x$ behavior of the gluon structure function from total cross sections
• Parton densities with the quark linear potential in the statistical approach
• Quark-antiquark asymmetry of helicity distributions in the nucleon sea
• Octet and decuplet contribution to the proton self energy
• Nucleon parton distributions from hadronic quantum fluctuations