Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-08-20
Int.J.Mod.Phys.A21:4599-4616,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 7 figures, Accepted for publication in Int. J. Mod. Phys. A
Scientific paper
10.1142/S0217751X06031107
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.
Khorramian Ali N.
Mirjalili Abolfazl
Tehrani Atashbar S.
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