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| Paper IPM / P / 7955 |
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| Abstract: | |||||||
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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 δu, δd, δ―u, δ―d and δ―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 Q2 evolution
of this quantity, using the polarized valon model is investigated.
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