Proton spin in a light-cone chiral quark model

Abstract

We discuss the spin structure of the proton in a light-cone treatment of the chiral quark model. Based on the fact that the quark helicity ($\Delta q$) measured in polarized deep inelastic scattering experiments is actually the quark spin defined in the light-cone formalism, rather than the quark spin ($\Delta q_{QM}$) defined in the conventionally quark model (or in the rest frame of the nucleon), we calculate the $x$-dependence of the polarized quark distribution functions $\Delta q(x)$, and the polarized structure functions $g_1(x)$. Special attention is focused on the Melosh-Wigner rotation due to the transversal motions of quarks inside the nucleon and its effects on the bare quark input. It is shown that our results match the experimental data well.

11 latex pages, 8 figures, final version published in PRD

References in corpus (24)

• Parton distributions for the LHC
• Quantum Chromodynamics and Other Field Theories on the Light Cone
• Measurements of the Proton and Deuteron Spin Structure Functions g1 and g2
• Precise determination of the spin structure function ${\mathbf{g}}_1$ of the proton, deuteron and neutron
• Light-Cone Representation of the Spin and Orbital Angular Momentum of Relativistic Composite Systems
• A Higher Order Perturbative Parton Evolution Toolkit (HOPPET)
• The Deuteron Spin-dependent Structure Function g1d and its First Moment
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• The Proton Spin and the Wigner Rotation
• The Quark Spin Distributions of the Nucleon
• Chiral Constituent quarks and their role in quark distribution functions of nucleon and pion
• Melosh Rotation and the Nucleon Tensor Charge
• Effect of Asymmetric Strange-Antistrange Sea to the NuTeV Anomaly
• Nucleon sea in the effective chiral quark model
• Light flavor asymmetry of nucleon sea
• Parton Sum Rules and Improved Scaling Variable
• Understanding the proton spin "puzzle" with a new "minimal" quark model
• Isospin Symmetry Breaking in the Chiral Quark Model

Cited by in corpus (2)

• Nucleon magnetic form factors with non-local chiral effective Lagrangian
• A Lattice Story of Proton Spin