Sd. Bass et al., Gluon virtuality and heavy sea-quark contributions to the spin-dependent g1 structure function - art. no. 034010, PHYS REV D, 6003(3), 1999, pp. 4010
We analyze the quark mass dependence of photon gluon fusion in polarized de
ep inelastic scattering for both the intrinsic and extrinsic gluon distribu
tions of the nucleon. We calculate the effective number of flavors for each
of the heavy and light quark photon gluon fusion contributions to the firs
t moment of the spin-dependent structure function g(1)(x). [S0556-2821(99)0
1115-7].