The Role of Polarized Valons in the Flavor Symmetry Breaking of Nucleon Sea

Abstract

Next-to-leading order approximation of the quark helicity distributions are used in the frame work of polarized valon model. The flavor-asymmetry in the light-quark sea of the nucleon can be obtained from the contributions of unbroken sea quark distributions. We employ the polarized valon model and extract the flavor-broken light sea distributions which are modeled with the help of a Pauli-blocking ansatz. Using this ansatz, we can obtain broken polarized valon distributions. From there and by employing convolution integral, broken sea quark distributions are obtainable in this frame work. 0ur results for $\delta u$, $\delta d$, $\delta \bar{u}$, $\delta \bar{d}$ and $\delta \bar{s}$ are in good agreement with recent experimental data for polarized parton distribution from HERMES experimental group and also with GRSV model. Some information on orbital angular momentum as a main ingredient of total nucleon spin are given. The $Q^2$ evolution of this quantity, using the polarized valon model is investigated.

arXiv comment18 pages, 7 figures, Accepted for publication in Int. J. Mod. Phys. A

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Cited by in corpus (5)

• The Jacobi Polynomials QCD analysis for the polarized structure function
• Polarized Deeply Inelastic Scattering (DIS) Structure Functions for Nucleons and Nuclei
• Nonsinglet parton distribution functions from the precise next-to-next-to-next-to leading order QCD fit
• NNLO QCD contributions to the flavor non-singlet sector of ${\mathbf{F}}_2(\mathbf{x},{\mathbf{Q}}^2)$
• New parton distributions in fixed flavour factorization scheme from recent deep-inelastic-scattering data