Instanton-induced charm contribution to polarized deep-inelastic scattering

Recent data on B decays involving \(\eta'\) may be explained if the singlet axial current of charmed quarks has large matrix element to \(\eta'\), and instantons were shown to be able to generate this effect. We study the magnitude of charm contributions to nucleon polarized structure functions generated in a similar way. Comparing the charm contribution, which is related to a dim(6) gluonic operator, to that of light quarks, which are related by the anomaly equation to \(G\tilde G\), we found that \(\Delta c/\Delta\Sigma\) = -(0.2-0.08). Future experiments like COMPASS at CERN identifying charm production in DIS can measure this ``intrinsic polarized charm'' component of the nucleon.