Alternative method to obtain the quark polarization of the nucleon - art. no. 057501

An alternate method is described to extract the quark contribution to the s pin of the nucleon directly from the first moment of the deuteron structure function g(l)(d). It is obtained without recourse to the use of input on t he nucleon wave function from hyperon decays involving the flavor symmetry parameters F and D. The result for the quark polarization of the nucleon, D elta Sigma (N), is in good agreement with the values of the singlet axial v ector current matrix element, a(0), obtained from recent next-to-leading or der analyses of current proton, neutron and deuteron data.