The Flavor Asymmetry of the Light Quark Sea from Semi-inclusive Deep-inelastic Scattering

Abstract

The flavor asymmetry of the light quark sea of the nucleon is determined in the kinematic range 0.02<x<0.3 and 1 GeV^2<Q^2<10 GeV^2, for the first time from semi-inclusive deep-inelastic scattering. The quantity (dbar(x)-ubar(x))/(u(x)-d(x)) is derived from a relationship between the yields of positive and negative pions from unpolarized hydrogen and deuterium targets. The flavor asymmetry dbar-ubar is found to be non-zero and x dependent, showing an excess of dbar over ubar quarks in the proton.

7 Pages, 2 figures, RevTeX format; slight revision in text, small change in extraction of dbar-ubar and comparison with a high q2 parameterization

References in corpus (5)

• Improved Parton Distributions from Global Analysis of Recent Deep Inelastic Scattering and Inclusive Jet Data
• Measurement of the Light Antiquark Flavor Asymmetry in the Nucleon Sea
• The HERMES Spectrometer
• Parton Distributions for Low Q^2
• The Flavor Asymmetry of the Nucleon Sea

Cited by in corpus (117)

• Improved Measurement of the $\bar{d}/\bar{u}$ Asymmetry in the Nucleon Sea
• Electron-Ion Collider in China
• Fragmentation Functions from Flavour-inclusive and Flavour-tagged e^+e^- Annihilations
• Prospects for Spin Physics at RHIC
• Quark helicity distributions in the nucleon for up, down, and strange quarks from semi--inclusive deep--inelastic scattering
• Flavor Structure of the Nucleon Sea from Lattice QCD
• Distribution Functions of the Nucleon and Pion in the Valence Region
• Multiplicities of charged pions and kaons from semi-inclusive deep-inelastic scattering by the proton and the deuteron
• Quark-hadron duality in electron scattering
• Quark-Hadron Duality in Electron Scattering
• Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering
• Flavor Asymmetry of Light Quarks in the Nucleon Sea
• The Spin Structure of the Nucleon
• Perturbative generation of a strange-quark asymmetry in the nucleon
• The Asymmetry of Antimatter in the Proton
• Novel Phenomenology of Parton Distributions from the Drell-Yan Process
• High-Energy Hadron-Induced Dilepton Production from Nucleons and Nuclei
• Moments of Isovector Quark Distributions from Lattice QCD
• 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
• Virtual meson cloud of the nucleon and generalized parton distributions
• Light-flavor sea-quark distributions in the nucleon in the SU(3) chiral quark soliton model (I) -- phenomenological predictions --
• Threshold Resummation for W-Boson Production at RHIC
• Effect of Asymmetric Strange-Antistrange Sea to the NuTeV Anomaly
• Generalized form factors, generalized parton distributions and the spin contents of the nucleon
• Statistical effect in the parton distribution functions of the nucleon
• $\bar{d}-\bar{u}$ asymmetry in the proton in chiral effective theory
• Parton Distributions for the Octet and Decuplet Baryons
• Nucleon sea in the effective chiral quark model
• Extraction of Various Five-Quark Components of the Nucleons
• Charge Symmetry Violating Contributions to Neutrino Reactions
• Detailed Balance and Sea-Quark Flavor Asymmetry of Proton
• Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at $\sqrt{s}$ = 510 GeV
• Transverse momentum distributions of quarks in the nucleon from the Chiral Quark Soliton Model
• The $qqqq\bar{q}$ components and hidden flavor contributions to the baryon magnetic moments
• Polarized Structure Functions g_2 (x) in the Chiral Quark Soliton Model
• Polarized light-antiquark distributions in a meson-cloud model
• Principle of Balance and the Sea Content of the Proton
• Chiral dynamics and partonic structure at large transverse distances
• Omega Meson Cloud and the Proton's Light Anti-Quark Distribution
• Pion structure function at small x from DIS data
• Semi-Inclusive Charged-Pion Electroproduction off Protons and Deuterons: Cross Sections, Ratios and Access to the Quark-Parton Model at Low Energies
• Strange quark asymmetry in the proton in chiral effective theory
• On the phenomenological analyses of $s$-$\bar{s}$ asymmetry in the nucleon sea
• The Sea of Quarks and Antiquarks in the Nucleon: a Review
• Connected-Sea Partons
• Parton distributions from nonlocal chiral SU(3) effective theory. I. Splitting functions
• Five-quark components in $\Delta (1232)\to N\pi$ decay
• Exploring the Partonic Structure of Hadrons through the Drell-Yan Process
• Evolution Equations for Connected and Disconnected Sea Parton Distributions
• Nonperturbative versus perturbative effects in generalized parton distributions
• Proton-deuteron asymmetry in Drell-Yan processes and polarized light-antiquark distributions
• Hadron mass corrections in semi-inclusive deep-inelastic scattering
• Constraints on $s-\bar{s}$ asymmetry of the proton in chiral effective theory
• Parton distributions from nonlocal chiral SU(3) effective theory: Flavor asymmetries
• Differential Distributions for NLO Analyses of Charged Current Neutrino-Production of Charm
• Spin and Orbital Angular Momentum Distribution Functions of the Nucleon
• The role of five-quark components in gamma decay of the $\Delta (1232)$
• Parton Distribution of Proton in a Simple Statistical Model
• Do we expect light flavor sea-quark asymmetry also for the spin-dependent distribution functions of the nucleon?
• Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab
• Sea quark contents of octet baryons
• NLO QCD procedure of the semi-inclusive deep inelastic scattering data analysis with respect to the light quark polarized sea
• Nuclear effects in the proton-deuteron Drell-Yan process
• Light flavor asymmetry of nucleon sea
• On the Momentum Dependence of the Flavor Structure of the Nucleon Sea
• Sea flavor content of octet baryons and intrinsic five-quark Fock states
• Electroproduction ratios of Baryon-Meson states and Strangeness Suppression
• $x-$dependence of the quark distribution functions in the $\chi$CQM${}_{\mathrm{config}}$
• Quark sea asymmetries of the octet baryons
• Polarized antiquark flavor asymmetry: Pauli blocking vs. the pion cloud
• Flavor Structure of the Nucleon Sea
• The Role of 5-quark Components on the Nucleon Form Factors
• Strangeness Suppression in q-qbar Creation Observed in Exclusive Reactions
• Parton distributions in the proton and pion
• 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
• Physics of the Nucleon Sea Quark Distributions
• Moments of Isovector Quark Distributions in Lattice QCD
• Nucleon structure functions and longitudinal spin asymmetries in the chiral quark constituent model
• Nucleon form factors and parton distributions in nonlocal chiral effective theory
• Comparison of kaon and pion valence quark distributions in a statistical model
• Sea Quark Flavor Asymmetry of Hadrons in Statistical Balance Model
• Pion-Exchange and Fermi-Motion Effects on the Proton-Deuteron Drell-Yan Process
• Extraction of the neutron F2 structure function from inclusive proton and deuteron deep-inelastic scattering data
• Quark flavor distribution functions for the octet baryons in the chiral quark constituent model
• The $qqqq\bar{q}$ components and the magnetic moments of the charmed and the bottomed baryons
• The axial charges of proton within an extended chiral constituent quark model
• 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
• Flavor Asymmetry of the Nucleon Sea and W Boson Production
• The flavour asymmetry and quark-antiquark asymmetry in the ${\Sigma }^{+}$-sea
• Light quark distributions in the proton sea
• $\bar{d}-\bar{u}$ asymmetry and semi-inclusive production of pions in DIS
• Multi-quark components in baryons
• Effect due to charge symmetry violation on the Paschos-Wolfenstein relation
• Orbital angular momentum of the proton and intrinsic five-quark Fock states
• Coordinate Space Distributions of Antiquark Flavor Asymmetries in the Proton
• From Nuclear Structure to Nucleon Structure
• Study of the $s-\bar{s}$ asymmetry in the proton
• Flavor asymmetry from the non-perturbative nucleon sea
• Proton Sea Quark Flavour Asymmetry and Roper Resonance
• Measurement of the Transverse Single-Spin Asymmetry for Mid-rapidity Production of Neutral Pions in Polarized p+p Collisions at 200 GeV Center-of-Mass Energy
• Can sea quark asymmetry shed light on the orbital angular momentum of the proton?
• Extraordinary nature of the nucleon scalar charge and its densities as a signal of nontrivial vacuum structure of QCD
• A Vision of Hadronic Physics
• The unquenched quark model
• Hadron Spectroscopy in the Unquenched Quark Model
• From C to Parton Sea: Bjorken-x Dependence of the PDFs
• Summary of the Structure Function Working Group at DIS'99
• \bar u - \bar d asymmetry - a few remarks
• A determination of the flavor asymmetric sea quarks in the proton
• Status of Spin Physics - Experimental Summary
• Flavor asymmetry of the nucleon sea in an unquenched quark model
• Bayesian Monte Carlo extraction of sea asymmetry with SeaQuest and STAR data
• On the dbar/ubar Asymmetry and Parton Distributions