Axial Anomaly and Light Cone Distributions

Abstract

Axial anomaly leads to exact sum rules for transition form factors providing the important constraints to respective distribution amplitudes. This rigorous NPQCD approach is valid even if QCD factorization is broken. The status of possible small non-OPE corrections to continuum in comparison to BABAR and BELLE data is discussed.

Comments: 6 pages, 2 figures. Presented by the first author at Light Cone 2012, 8-13 July 2012, Cracow, Poland. v2: typos corrected, reference added