Do we expect light flavor sea-quark asymmetry also for the spin-dependent distribution functions of the nucleon?

Abstract

After taking account of the scale dependence by means of the standard DGLAP evolution equation, the theoretical predictions of the chiral quark soliton model for the unpolarized and longitudinally polarized structure functions of the nucleon are compared with the recent high energy data. The theory is shown to explain all the qualitative features of the experiments, including the NMC data for $F_2^p(x)-F_2^n(x)$, $F_2^n(x)/F_2^p(x)$, the Hermes and NuSea data for $\bar{d}(x)-\bar{u}(x)$, the EMC and SMC data for $g_1^p(x)$, $g_1^n(x)$ and $g_1^d(x)$. Among others, flavor asymmetry of the longitudinally polarized sea-quark distributions is a remarkable prediction of this model, i.e., it predicts that $\Delta \bar{d}(x)-\Delta \bar{u}(x)=C{x}^{\alpha }[\bar{d}(x)-\bar{u}(x)]$ with a sizable negative coefficient $C\simeq -2.0$ (and $\alpha \simeq 0.12$) in qualitative consistency with the recent semi-phenomenological analysis by Morii and Yamanishi.

arXiv comment14pages, including 5 eps_figures with epsbox.sty, latex

References in corpus (18)

• Measurements of the Proton and Deuteron Spin Structure Functions g1 and g2
• Precision Determination of the Neutron Spin Structure Function g1n
• Baryons as non-topological chiral solitons
• Measurement of the Light Antiquark Flavor Asymmetry in the Nucleon Sea
• Flavor Asymmetry of Antiquark Distributions in the Nucleon
• Nucleon Parton Distributions at Low Normalization Point in the Large N_c Limit
• Baryons as Chiral Solitons in the Nambu--Jona-Lasinio Model
• The Flavor Asymmetry of the Light Quark Sea from Semi-inclusive Deep-inelastic Scattering
• Unpolarized and polarized quark distributions in the large-Nc limit
• Chiral Symmetry and the Nucleon Spin Structure Functions
• Numerical solution of Q^2 evolution equations for polarized structure functions
• Isovector unpolarized quark distribution in the nucleon in the large-N_c limit
• $1/N_c$ Rotational Corrections to $g_A$ and Isovector Magnetic Moment of the Nucleon
• Chiral Symmetry and the Nucleon Structure Functions
• Nucleon Structure Functions from a Chiral Soliton
• Numerical solution of Q^2 evolution equation for the transversity distribution Delta_T q
• Polarized rho mesons and the asymmetry between Delta d^bar(x) and Delta u^bar(x) in the sea of the nucleon
• On the polarization of the nucleon sea in the meson cloud model

Cited by in corpus (16)

• The Spin Structure of the Nucleon
• Flavor Structure of the Nucleon Sea
• Light-flavor sea-quark distributions in the nucleon in the SU(3) chiral quark soliton model (I) -- phenomenological predictions --
• Inclusive and Semi-Inclusive Polarized DIS Data Revisited
• Threshold Resummation for W-Boson Production at RHIC
• Polarized Antimatter in the Proton from Global QCD Analysis
• Polarized light-antiquark distributions in a meson-cloud model
• Polarized Structure Functions g_2 (x) in the Chiral Quark Soliton Model
• Pi N sigma-term and chiral-odd twist-3 distribution function e(x) of the nucleon in the chiral quark soliton model
• The Sea of Quarks and Antiquarks in the Nucleon: a Review
• Chiral-odd distribution functions in the chiral quark soliton model
• Spin and Orbital Angular Momentum Distribution Functions of the Nucleon
• Flavor Structure of the Nucleon Sea
• Polarized light-flavor antiquarks from Drell-Yan processes of h+\vec{N}\to\vec{l^{+-}} + l^{-+} + X
• Quark-antiquark asymmetry of helicity distributions in the nucleon sea
• Polarized Parton Distributions and the Polarized Gluon Asymmetry