Instanton-induced charm contribution to polarized deep-inelastic scattering

Abstract

Recent data on B decays involving ${\eta }^{\prime }$ may be explained if the singlet axial current of charmed quarks has large matrix element to ${\eta }^{\prime }$, 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.

Comments: 12 pages, LaTeX, RevTex, epsfig.sty, 3 figures, one sign in Euclidean definitions corrected