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Title

FLAVOR SYMMETRY BREAKING IN THE POLARIZED SEA QUARK DISTRIBUTIONS

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Abstract

 HELICITY QUARK DISTRIBUTIONS IN THE NEXT-TO-LEADING APPROXIMATION OF PERTURBATIVE QCD ARE CONSIDERED. USING THE CONTRIBUTIONS FOR THE UNBROKEN SEA QUARK DISTRIBUTIONS, WE CAN OBTAIN THE FLAVOR-ASYMMETRY IN THE LIGHT-QUARK SEA OF THE NUCLEON. THE FLAVOR-BROKEN LIGHT SEA DISTRIBUTIONS CAN BE MODELED WITH THE HELP OF A PAULI-BLOCKING ANSATZ. OUR RESULTS FOR D`D, D`U, DD, DU AND D`S ARE IN GOOD AGREEMENT WITH THE RECENT EXPERIMENTAL DATA FOR POLARIZED PARTON DISTRIBUTION FROM HERMES EXPERIMENTAL GROUP.

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