American Physical Society;United States: American Physical Society
摘要:
摘要： 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) + 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 ū(x) + d(x) have a distinct Bjorken x dependence in qualitative agreement with expectation. The analysis also shows that the momentum fraction of ū(x) + d(x) is about equally divided between the CS and DS at Q(2) = 2.5 GeV(2). Implications for the future global analysis of parton distributions are presented. 其他題名： Phys Rev Lett 出版者： United States: American Physical Society 出版日期： 2012-12-21 出處： Physical review letters, 2012-12, Vol.109 (25), p.252002, Article 252002 資源來源： American Physical Society Journals 識別號： ISSN: 0031-9007 識別號： ISSN: 1079-7114 識別號： EISSN: 1079-7114 識別號： DOI: 10.1103/PhysRevLett.109.252002 識別號： PMID: 23368452
