Some considerations on the production mechanisms for theJandψparticles and charmed particles

Abstract

The recent discovery of $J$ and $\psi$ particles with anomalous properties, together with the theoretical expectation of charm related particles with predicted mass values accessible to the Fermilab range of energy, suggests that a reasonably systematic discussion of production mechanisms for these particles might be appropriate. We discuss here (a) hadron-initiated, (b) photon-initiated, and (c) lepton-initiated ($l=e,\mu$) mechanisms for the production of these objects.