Abstract
The background field theory is applied to study the internal spin structure of the proton in terms of both the large N c expansion and derivative expansion. A new flavor-independent axial-vector current has been derived. Due to the higher order of this current in the large N c expansion and the higher order in the derivative expansion a small quark spin content is expected and a nonzero strange quark spin content is revealed from the large N c expansion. The numerical results are in agreement with the data.
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