Light quark pseudoscalar densities and anomaly matrix elements for {\eta} and {\eta}' mesons

Abstract

Matrix elements of flavor-diagonal light quark pseudoscalar densities and axial anomaly operators between vacuum and {\eta} and {\eta}' meson states have been determined. This has been done by evaluating current-current correlators of octet-octet and octet-singlet axial currents using QCD sum rules. The numerical values obtained for the matrix elements compare well with those obtained in the current literature.

Comments: 10 pages, 12 figures, LaTex, typos added, one table replaced; to be published in Physical Review D