Flavor Asymmetry of Light Quarks in the Nucleon Sea

Abstract

A surprisingly large asymmetry between the up and down sea quark distributions in the nucleon has been observed in recent deep inelastic scattering and Drell-Yan experiments. This result strongly suggests that the mesonic degrees of freedom play an important role in the description of the parton distributions of the hadronic sea. In this article, we review the current status of our knowledge of the flavor structure of the nucleon sea. The implications of various theoretical models as well as possible future measurements are also discussed.

41 pages, 22 figures. To appear in "Prog. Part. Nucl. Phys.", volume 47, issue 2, (2001)

References in corpus (1)

• Coordinate Space Distributions of Antiquark Flavor Asymmetries in the Proton

Cited by in corpus (97)

• Determination of nuclear parton distribution functions and their uncertainties at next-to-leading order
• Determination of fragmentation functions and their uncertainties
• Distribution Functions of the Nucleon and Pion in the Valence Region
• Nuclear parton distribution functions and their uncertainties
• Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering
• Determination of polarized parton distribution functions and their uncertainties
• Study of $qqqc\bar{c}$ five quark system with three kinds of quark-quark hyperfine interaction
• Global analysis of nuclear parton distribution functions and their uncertainties at next-to-next-to-leading order
• New limits on intrinsic charm in the nucleon from global analysis of parton distributions
• Strange quark suppression from a simultaneous Monte Carlo analysis of parton distributions and fragmentation functions
• The $s\bar{s}$ component of the proton and the strangeness magnetic moment
• Novel Phenomenology of Parton Distributions from the Drell-Yan Process
• Determination of gluon polarization from deep inelastic scattering and collider data
• Measurement of longitudinal spin asymmetries for weak boson production in polarized proton-proton collisions at RHIC
• Unquenched quark model for baryons: magnetic moments, spins and orbital angular momenta
• Determination of polarized parton distribution functions with recent data on polarization asymmetries
• Flavor Asymmetry of the Nucleon Sea and the Five-Quark Components of the Nucleons
• Flavor Structure of the Nucleon Sea
• Charge Symmetry at the Partonic Level
• Light-flavor sea-quark distributions in the nucleon in the SU(3) chiral quark soliton model (I) -- phenomenological predictions --
• Strangeness spin, magnetic moment and strangeness configurations of the proton
• Evidence for a new ${\Sigma }^{\ast }$ resonance with $J^P=1/2^{-}$ in the old data of $K^{-}p\to \Lambda {\pi }^{+}{\pi }^{-}$ reaction
• Evidence for the Absence of Gluon Orbital Angular Momentum in the Nucleon
• Pion structure function from leading neutron electroproduction and SU(2) flavor asymmetry
• Further evidence for the ${\Sigma }^{\ast }$ resonance with $J^P=1/2^{-}$ around 1380 MeV
• On the nature of the lowest $1/2^{-}$ baryon nonet and decuplet
• Five-quark components in baryons
• Tensor-polarized structure function $b_1$ in the standard convolution description of the deuteron
• Chiral dynamics and the growth of the nucleon's gluonic transverse size at small x
• The $qqqq\bar{q}$ components and hidden flavor contributions to the baryon magnetic moments
• Tensor-polarized quark and antiquark distribution functions in a spin-one hadron
• Chiral dynamics and partonic structure at large transverse distances
• Transverse-momentum-dependent parton distribution functions up to twist 4 for spin-1 hadrons
• Towards a Unified Model of Neutrino-Nucleus Reactions for Neutrino Oscillation Experiments
• Principle of Balance and the Sea Content of the Proton
• Pion structure function at small x from DIS data
• Non-perturbative structure of the polarized nucleon sea
• Nuclear physics with a medium-energy Electron-Ion Collider
• The Sea of Quarks and Antiquarks in the Nucleon: a Review
• Connected-Sea Partons
• Comparison of the Gottfried and Adler sum rules within the large-Nc expansion
• Nuclear Uncertainties in the Determination of Proton PDFs
• Exploring the Partonic Structure of Hadrons through the Drell-Yan Process
• Five-quark components in $\Delta (1232)\to N\pi$ decay
• Diffractive gauge bosons production beyond QCD factorisation
• Theoretical estimate on tensor-polarization asymmetry in proton-deuteron Drell-Yan process
• Evolution Equations for Connected and Disconnected Sea Parton Distributions
• Nuclear EMC Effect in a Statistical Model
• Constraints on $s-\bar{s}$ asymmetry of the proton in chiral effective theory
• Parton Distribution of Proton in a Simple Statistical Model
• Nuclear effects in the proton-deuteron Drell-Yan process
• Sea quark contents of octet baryons
• Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab
• A prediction of $D^{\ast }$-multi-$\rho$ states
• Strangeness in the proton and N*(1535)
• On the Momentum Dependence of the Flavor Structure of the Nucleon Sea
• Light flavor asymmetry of nucleon sea
• Sea flavor content of octet baryons and intrinsic five-quark Fock states
• On the extraction of the intrinsic light-quark sea in the proton
• Flavor Structure of the Nucleon Sea
• Flavor structure of the unpolarized and longitudinally-polarized sea-quark distributions in the nucleon
• High--Energy Photon--Hadron Scattering in Holographic QCD
• Transverse spin effects of sea quarks in unpolarized nucleons
• Hadron Physics at J-PARC
• Sigma Meson Cloud and Proton's Light Flavor Sea Quarks
• Measurement of flavor asymmetry of light-quark sea in the proton with Drell-Yan dimuon production in $p+p$ and $p+d$ collisions at 120 GeV
• Projections of structure functions in a spin-one hadrons
• Complementary studies on $N^{\ast }$ from $e^{+}{e}^{-}$, $pp$ and $p\bar{p}$ collisions
• Tensor-polarized structure functions: Tensor structure of deuteron in 2020's
• Properties of JP = 1/2+ baryon octets at low energy
• The s-s(bar) asymmetry in nucleon and "NuTeV anomaly"
• Nuclear corrections of parton distribution functions
• EMC effect in the next-to-leading order approximation based on the Laplace transformation
• Parton distribution functions and fragmentation functions of spin-1 hadrons
• Evaluation of the isospin asymmetry of the nucleon structure functions with CLAS++
• Sea Quark Flavor Asymmetry of Hadrons in Statistical Balance Model
• Pions in Proton Structure and Everywhere Else
• Spin Orbit Correlations and the Structure of the Nucleon
• Flavor Asymmetry of the Nucleon Sea and W Boson Production
• 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
• Phenomenological analysis of nucleon strangeness and meson-nucleon sigma terms
• Intrinsic light and strange quark--antiquark pairs in the proton and nonperturbative strangeness suppression
• The spin dependent structure functions of the nucleon
• Plans for Hadronic Structure Studies at J-PARC
• Multi-quark components in baryons
• Pion-production cross sections in neutrino reactions for studying generalized parton distributions of the nucleon
• Valence and sea quarks in the nucleon
• Flavor asymmetry from the non-perturbative nucleon sea
• Test of CDF dijet anomaly within the standard model
• Can sea quark asymmetry shed light on the orbital angular momentum of the proton?
• Proton Sea Quark Flavour Asymmetry and Roper Resonance
• Nuclear effects in deep inelastic scattering and transition region
• Gottfried sum rule from maximum entropy method quark distributions with DGLAP evolution and DGLAP evolution with GLR-MQ-ZRS corrections
• Recent developments in the constituent quark model including quark-antiquark pairs
• Status of Spin Physics - Experimental Summary
• Flavor asymmetry of the polarized nucleon sea
• Baryons in the unquenched quark model