Flavor structure of the unpolarized and longitudinally-polarized sea-quark distributions in the nucleon

Abstract

It is now widely recognized that a key to unravel the nonperturbative chiral-dynamics of QCD hidden in the deep-inelastic-scattering observables is the flavor structure of sea-quark distributions in the nucleon. We analyze the flavor structure of the nucleon sea in both of the unpolarized and longitudinally polarized parton distribution functions (PDFs) within a single theoretical framework of the flavor SU(3) chiral quark soliton model (CQSM), which contains only one adjustable parameter $\Delta m_s$, the effective mass difference between the strange and nonstrange quarks. A particular attention is paid to a nontrivial correlation between the flavor asymmetry of the unpolarized and longitudinally polarized sea-quark distributions and also to a possible particle-antiparticle asymmetry of the strange quark distributions in the nucleon. We also investigate the charge-symmetry-violation (CSV) effects in the parton distribution functions exactly within the same theretical framework, which is expected to provide us with valuable information on the relative importance of the asymmetry of the strange and antistrange distributions and the CSV effects in the valence-quark distributions inside the nucleon in the resolution scenario of the so-called NuTeV anomaly in the extraction of the Weinberg angle.

The Version to appear in Physical Review D, RevTeX 51 pages, 19 figures, 2 tables

References in corpus (16)

• New parton distributions for collider physics
• Implications of CTEQ global analysis for collider observables
• Global analysis of fragmentation functions for pions and kaons and their uncertainties
• Extraction of Spin-Dependent Parton Densities and Their Uncertainties
• Evidence for polarization of gluons in the proton
• Global Analysis of Helicity Parton Densities and Their Uncertainties
• Global Analysis of Fragmentation Functions for Protons and Charged Hadrons
• Determination of fragmentation functions and their uncertainties
• Measurement of Azimuthal Asymmetries in Inclusive Production of Hadron Pairs in e+e- Annihilation at \sqrt{s} = 10.58 GeV
• Measurement of Parton Distributions of Strange Quarks in the Nucleon from Charged-Kaon Production in Deep-Inelastic Scattering on the Deuteron
• Precision determination of electroweak parameters and the strange content of the proton from neutrino deep-inelastic scattering
• MRST partons generated in a fixed-flavour scheme
• Nuclear PDFs from neutrino deep inelastic scattering
• The Polarised Valence Quark Distribution from semi-inclusive DIS
• Flavor Asymmetry of the Nucleon Sea and the Five-Quark Components of the Nucleons
• Charge Symmetry Breaking in Parton Distribution Functions from Lattice QCD

Cited by in corpus (5)

• The Spin Budget of the Proton at NNLO and Beyond
• 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
• Nucleon strangeness polarization from $\Lambda /\bar{\Lambda }$ hyperon production in polarized proton-proton collision at RHIC
• Chiral Soliton Models and Nucleon Structure Functions
• Flavor asymmetry of the polarized nucleon sea