On the momentum dependence of the flavor structure of the nucleon sea

Jen Chieh Peng, Wen Chen Chang, Hai Yang Cheng, Tie Jiun Hou, Keh Fei Liu, Jian Wei Qiu

Research output: Contribution to journalArticlepeer-review


Difference between the u- and d- sea quark distributions in the proton was first observed in the violation of the Gottfried sum rule in deep-inelastic scattering (DIS) experiments. The parton momentum fraction x dependence of this difference has been measured over the region 0.02. <. x<. 0.35 from Drell-Yan and semi-inclusive DIS experiments. The Drell-Yan data suggested a possible sign-change for d-(x)-u-(x) near x~. 0.3, which has not yet been explained by existing theoretical models. We present an independent evidence for the d-(x)-u-(x) sign-change at x~. 0.3 from an analysis of the DIS data. We further discuss the x-dependence of d--u- in the context of meson cloud model and the lattice QCD formulation.

Original languageEnglish (US)
Pages (from-to)411-414
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - Sep 7 2014


  • D-(x)-u-(x)
  • Lattice QCD
  • Parton distributions
  • Sea quark

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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