Abstract

The double-diffractive production of $\chi_c$ and $\chi_b$ mesons, with a rapidity gap on either side, is studied, using both the Regge formalism and the perturbative QCD approach. Due to the rather low scale, the exclusive double-diffractive process $pp\to p + \chi + p$ is predicted to dominate, whereas the probability that the incoming protons dissociate is expected to be relatively small. We evaluate the corresponding $\chi$ production cross sections at the Tevatron and LHC energies. For the double-diffractive process with proton dissociation, it is possible to select events with large transverse momenta transferred through the rapidity gaps, by measuring the transverse energy, $E_\perp$ , flows in the proton fragmentation regions. Then the large $E_\perp$ provides a scale to justify the use of perturbative QCD, and to allow a spin-parity analysis of the centrally produced system to be performed, by studying the azimuthal angular correlations between the directions of the forward and backward $E_\perp$ flows. The central production of the new X(3872) charmonium state is considered.

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