Abstract
We investigate the polarized structure of the proton based on the modified chiral quark model (). We calculate the polarized quark, antiquark and gluon densities inside the proton at low Q2 values using the . We then evolve these densities to high energy scales. The polarized antiquark and gluon distributions are obtained using the . These distributions can be calculated in our model, considering the gluon cloud which surrounds the bare quarks. This is a new feature which was not taken into account previously in the polarized . Using the ‘Pauli-blocking’ ansatz, we are able to extract asymmetric antiquark densities which are flavor dependent. It is shown that our results are in good agreement with the experimental data and also compatible with the different fitting parameterizations. What makes our results more distinctive is that all initial parton densities are obtained via a completely theoretical framework in which we do not need to resort to any specific parameterizations.
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