Valence and sea quarks in the nucleon

  title={Valence and sea quarks in the nucleon},
  author={R. Bijker and E. Santopinto},
  journal={arXiv: Nuclear Theory},
In this contribution, we discuss the spin and flavor content of the proton in the framework of the unquenched quark model, and address the role of valence and sea quarks in the nucleon. 

Tables from this paper

The spin structure of the nucleon.
Analytic calculations of the hadron spectrum have now being realized using light-front holography and superconformal quantum mechanics, a novel approach providing a well-founded semiclassical approximation to QCD. Expand
Can sea quark asymmetry shed light on the orbital angular momentum of the proton
A striking prediction of several extensions of the constituent quark model, including the unquenched quark model, the pion cloud model and the chiral quark model, is a proportionality relationshipExpand
RPA treatment of a motivated QCD Hamiltonian in the SO(4) (2 + 1)-flavor limit: Light and strange mesons
The SO(4) symmetry of a sector of the quantum chromodynamics (QCD) Hamiltonian was analyzed in a previous work. The numerical calculations were then restricted to a particle–hole (ph) space and theExpand


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 resultExpand
Flavor asymmetry of the nucleon sea and the five-quark components of the nucleons.
The qualitative agreement between the data and the calculations is interpreted as evidence for the existence of the intrinsic light-quark sea in the nucleons. Expand
Flavor and spin contents of the nucleon in the quark model with chiral symmetry.
  • Cheng, Li
  • Physics, Medicine
  • Physical review letters
  • 1995
A simple calculation in the framework of the chiral quark theory of Manohar and Georgi yields results that can account for many of the ``failures'' of the naive quark model: significant strange quarkExpand
Unquenched quark model for baryons: Magnetic moments, spins, and orbital angular momenta
We present an unquenched quark model for baryons in which the effects of the quark-antiquark pairs (uū, dđ, and ss) are taken into account in an explicit form via a microscopic, QCD-inspired,Expand
Pion fluctuation in deep inelastic scattering
Abstract.The forward neutron production in the ep collisions at 300GeV measured by H1 and ZEUS Collaborations at DESY has been used to estimate the total probability for proton fluctuation into nπ+Expand
Flavor asymmetry of antiquark distributions in the nucleon
Violation of the Gottfried sum rule was suggested by the New Muon Collaboration in measuring proton and deuteron F2 structure functions. The finding triggered many theoretical studies on physicsExpand
Mesonic Contributions to the Spin and Flavor Structure of the Nucleon
Since its initial investigation at SLAC in the late 60's, deep inelastic lepton scattering has provided a wonderful tool to explore perturbative QCD and to test many features of the Standard Model.Expand
Flavor asymmetry in the light-quark sea of the nucleon.
A model calculation in chiral field theory shows how an up-down asymmetry can arise from the dissociation of a quarks into a quark plus a pion within the nucleon. Expand
General method of calculation of any hadronic decay in the3P0 model
The3P0 pair creation model of hadron decays is generalized to be applicable to the decay of any hadron. The wave function of the decaying hadron is expanded in terms of two clusters. The transitionExpand
Orbital angular momentum in the nucleon
Analysis of the measured value of the integrated $\mathrm{d\ifmmode \bar{}\else \={}\fi{}}$-$\mathrm{u\ifmmode \bar{}\else \={}\fi{}}$ asymmetry (${I}_{\mathrm{fas}}$ $=$ 0.147Expand