Observation of Diffractive $J/\psi$ Production at the Fermilab Tevatron

T. Affolder

We report the first observation of diffractive $J/\psi (\to {\mu }^{+}{\mu }^{-})$ production in $\bar{p}p$ collisions at $\sqrt{s}$=1.8 TeV. Diffractive events are identified by their rapidity gap s…