Leading-twist two gluon distribution amplitude and exclusive processes involving eta and eta' mesons

Abstract

I briefly review the formalism for treating the leading-twist two-gluon states appearing in processes which involve eta and eta' mesons. The constraints on the size of the lowest order Gegenbauer coefficients of the two-gluon distribution amplitude are obtained from the fit to the eta and eta' transition form factor data. The results are applied to chi -> eta eta (eta' eta') decays and deeply virtual electroproduction of eta and eta' mesons.

Comments: 7 pages, 1 figure (using LATEX with ws-procs9x6.cls); talk presented at the workshop on Exclusive Processes at High Momentum Transfer, Jefferson Lab, Newport News, Virginia, 15 -18 May 2002