  We perform a new extraction for unpolarized and polarized parton distribution
functions considering a flavor decompositions for sea quarks and applying very
recent deep inelastic scattering (DIS) and semi inclusive deep inelastic
scattering (SIDIS) data in the fixed flavor number scheme (FFNS) framework. In
the new symmetry breaking scenario the light quark and antiquark densities are
extracted separately and new parametrization forms are determined for them. The
heavy flavors contribution, including charm and bottom quarks, are also taken
to be account for unpolarized distributions.

High Energy Physics - Phenomenology