Light flavor asymmetry of nucleon sea

Abstract

The light flavor antiquark distributions of the nucleon sea are calculated in the effective chiral quark model and compared with experimental results. The contributions of the flavor-symmetric sea-quark distributions and the nuclear EMC effect are taken into account to obtain the ratio of Drell-Yan cross sections ${\sigma }^{\mathrm{pD}}/2{\sigma }^{\mathrm{pp}}$, which can match well with the results measured in the FermiLab E866/NuSea experiment. The calculated results also match the measured $\bar{d}(x)-\bar{u}(x)$ from different experiments, but unmatch the behavior of $\bar{d}(x)/\bar{u}(x)$ derived indirectly from the measurable quantity ${\sigma }^{\mathrm{pD}}/2{\sigma }^{\mathrm{pp}}$ by the FermiLab E866/NuSea Collaboration at large $x$. We suggest to measure again $\bar{d}(x)/\bar{u}(x)$ at large $x$ from precision experiments with careful experimental data treatment. We also propose an alternative procedure for experimental data treatment.

10 pages, 8 figures, final version to appear in EPJC

References in corpus (5)

• Statistical effect in the parton distribution functions of the nucleon
• Nuclear EMC Effect in a Statistical Model
• Sea quark contents of octet baryons
• EMC effect in semi-inclusive deep-inelastic scattering process
• Isospin Symmetry Breaking in the Chiral Quark Model

Cited by in corpus (5)

• Flavor Structure of the Nucleon Sea
• Sea flavor content of octet baryons and intrinsic five-quark Fock states
• 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
• Proton spin in a light-cone chiral quark model
• Flavor asymmetry from the non-perturbative nucleon sea