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 a large matrix element to eta', a nd instantons were shown to be able to generate this effect. We study the magnitude of charm contributions to nucleon polarized structure fu nctions 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 (G) over tilde, we fo und that Delta c/Delta Sigma similar or equal to -0.03. Future experim ents like COMPASS at CERN identifying charm production in DIS can meas ure this ''intrinsic polarized charm'' component of the nucleon. (C) 1 998 Elsevier Science B.V. All rights reserved.