  According to the path-integral formalism of the hadronic tensor, the nucleon
sea contains two distinct components called connected sea (CS) and disconnected
sea (DS). We discuss how the CS and DS are accessed in the lattice QCD
calculation of the moments of the parton distributions. We show that the CS and
DS components for $\bar u(x) + \bar d(x)$ can be extracted by using recent data
on the strangeness parton distribution, the CT10 global fit, and the lattice
result of the ratio of the strange to $u(d)$ moments in the disconnected
insertion. The extracted CS and DS for $\bar u(x) + \bar d(x)$ have distinct
Bjorken $x$ dependence in qualitative agreement with expectation. The analysis
also shows that the momentum fraction of the $\bar u(x) + \bar d(x)$ is about
equally divided between CS and DS at $Q^2 = 2.5 {\rm GeV}^2$. Implications on
future global analysis for parton distributions are presented.

High Energy Physics - Phenomenology;High Energy Physics - Experiment;High Energy Physics - Lattice;Nuclear Theory