Connected-sea partons

Keh Fei Liu, Wen Chen Chang, Hai Yang Cheng, Jen Chieh Peng

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


According to the path-integral formalism of the hadronic tensor, the nucleon sea contains two distinct components called the connected sea (CS) and the 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 of ū(x)+d̄(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 ū(x)+d̄(x) have a distinct Bjorken x dependence in qualitative agreement with expectation. The analysis also shows that the momentum fraction of ū(x)+d̄(x) is about equally divided between the CS and DS at Q2=2.5 GeV2. Implications for the future global analysis of parton distributions are presented.

Original languageEnglish
Article number252002
JournalPhysical Review Letters
Issue number25
StatePublished - Dec 21 2012

ASJC Scopus subject areas

  • General Physics and Astronomy


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