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

15 Scopus citations

Abstract

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
Volume736
DOIs
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 .

Keywords

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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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