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

Abstract

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 signature. In a sample of events with two muons of transverse momentum $p_T^{\mu }>2$ GeV/$c$ within the pseudorapidity region $|\eta |<$1.0, the ratio of diffractive to total $J/\psi$ production rates is found to be $R_{J/\psi }=[1.45\pm 0.25]$. The ratio $R_{J/\psi }(x)$ is presented as a function of $x$-Bjorken. By combining it with our previously measured corresponding ratio $R_{jj}(x)$ for diffractive dijet production, we extract a value of $0.59\pm 0.15$ for the gluon fraction of the diffractive structure function of the proton.

9 pages, 4 figures, using RevTeX. Submitted to Physical Review Letters

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