We review the current status of parton distribution function (PDF) determinations for
unpolarized and longitudinally polarized protons and for unpolarized nuclei, which are …

Violation of the Gottfried sum rule was suggested by the New Muon Collaboration in
measuring proton and deuteron F2 structure functions. The finding triggered many …

A precise measurement of the ratio of Drell-Yan yields from an 800 GeV/c proton beam
incident on hydrogen and deuterium targets is reported. Over 140 000 Drell-Yan muon pairs …

The S-wave Σ c D¯ and Λ c D¯ states with isospin I= 1/2 and spin S= 1/2 are dynamically
investigated within the framework of a chiral constituent quark model by solving a resonating …

Using the Euclidean path-integral formulation for the hadronic tensor, we show that the large
difference between u and d does not come from the disconnected quark-loop insertion …

Quark-chiral field interaction is studied in terms of the linear realization of the Lagrangian
which is invariant under the SU (3) L× SU (3) R infinitesimal transformation and then is …

Although the distributions of sea quarks and antiquarks generated by leading-twist QCD
evolution through gluon splitting g→ qq are necessarily CP symmetric, the distributions of …

Parton distributions with an excess of down quarks over up quarks in the sea can reproduce
data on the structure functions F 2 μ p, F 2 μ n, and x F 3 ν N. A model calculation in chiral …

Abstract The Drell-Yan cross section ratios, σ (p+ d)/σ (p+ p), measured in Fermilab E866,
have led to the first determination of d (x)/ū (x), d (x)− ū (x), and the integral of d (x)− ū (x) for …

A surprisingly large asymmetry between the up and down sea quark distributions in the
nucleon has been observed in recent deep inelastic scattering and Drell-Yan experiments …