Exploring timelike exclusive processes in the light-front approach

Abstract

We discuss a necessary nonvalence contribution in timelike exclusive processes. Utilizing a Schwinger-Dyson type of approach, we relate the nonvalence contribution to an ordinary light-front wave function that has been extensively tested in the spacelike exclusive processes. An application to $K_{\ell 3}$ decays provides encouraging results.

Comments: Contribution to the third international conference on ``Perspectives in Hadronic Physics", 7-11 May 2001, Miramare-Trieste, Italy; 4 pages including 2 figures