On the Momentum Dependence of the Flavor Structure of the Nucleon Sea

Abstract

Difference between the $\bar{u}$ and $\bar{d}$ 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 $\bar{d}(x)-\bar{u}(x)$ near $x\sim 0.3$, which has not yet been explained by existing theoretical models. We present an independent evidence for the $\bar{d}(x)-\bar{u}(x)$ sign-change at $x\sim 0.3$ from an analysis of the DIS data. We further discuss the $x$-dependence of $\bar{d}(x)-\bar{u}(x)$ in the context of meson cloud model and the lattice QCD formulation.

5 pages, 5 figures, final version

References in corpus (6)

• Parton distributions for the LHC
• New parton distributions for collider physics
• Flavor Structure of the Nucleon Sea from Lattice QCD
• Delineating parton distributions and the strong coupling
• Novel Phenomenology of Parton Distributions from the Drell-Yan Process
• Flavor Asymmetry of the Nucleon Sea and the Five-Quark Components of the Nucleons

Cited by in corpus (10)

• Flavor Structure of the Nucleon Sea
• Valence quark distributions of the proton from maximum entropy approach
• PDF in PDFs from Hadronic Tensor and LaMET
• Nucleon structure functions and longitudinal spin asymmetries in the chiral quark constituent model
• Quark flavor distribution functions for the octet baryons in the chiral quark constituent model
• Connected and Disconnected Sea Partons from CT18 Parametrization of PDFs
• Electromagnetic and Axial-Vector Form Factors of the Quarks and Nucleon
• Improved determination of $\bar{d}(x)-\bar{u}(x)$ flavor asymmetry in the proton by BONuS experiment at JLAB and using an approach by Brodsky, Hoyer, Peterson, and Sakai
• The Flavor Structure of the Nucleon Sea
• A determination of the flavor asymmetric sea quarks in the proton