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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.

Document Type

Article

Publication Date

9-7-2014

Notes/Citation Information

Published in Physics Letters B, v. 736, p. 411-414.

© 2014 The Authors. Published by Elsevier B.V.

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/). Funded by SCOAP3.

Digital Object Identifier (DOI)

http://dx.doi.org/10.1016/j.physletb.2014.07.050

Funding Information

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.

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