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

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15 Scopus citations


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

Bibliographical note

Funding Information:
We acknowledge helpful discussion with Jiunn-Wei Chen and Chien-Peng Yuan. This work was supported in part by the National Science Council of the Republic of China and the U.S. Department of Energy under contact Nos. DE-AC02-98CH10886 and DE-FG05-84ER40154 , and the National Science Foundation under grant Nos. PHY-0969739 and PHY-1316617 .


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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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