2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46788We present a formalism for studying the exclusive production or decay of mesons with any value of the internal orbital angular momentum L. As an application, we discuss the production of meson pairs (involving tensor and pseudotensor mesons) in photon-photon collisions.11 pages, 4 embedded ps figures, uses macros sprocl.sty, epsfig.sty. Talk delivered by F. Murgia at the Diquark III Workshop, Torino, Italy, October 28-30, 1996. To be published in the proceedingsHigh Energy Physics - Phenomenologytext