Central exclusive χ c meson production at the Tevatron revisited

Motivated by the recent experimental observation of exclusive chi (c) events at the Tevatron, we revisit earlier studies of central exclusive scalar chi (c0) meson production, before generalising the existing formalism to include chi (c1) and chi (c2) mesons. Although chi (c0) production was previously assumed to be dominant, we find that the chi (c1) and chi (c2) rates for the experimentally considered chi (c) -> J/psi gamma ->mu (+) mu (-) gamma decay process are in fact comparable to the chi (c0) rate. We have developed a new Monte Carlo event generator, SuperCHIC, which models the central exclusive production of the three chi (c) states via this decay chain, and have explored possible ways of distinguishing them, given that their mass differences are not resolvable within the current experimental set-up. Although we find that the severity of current experimental cuts appears to preclude this, the acceptance does not change crucially between the three states and so our conclusions regarding the overall rates remain unchanged. This therefore raises the interesting possibility that exclusive chi (c1) and chi (c2) production has already been observed at the Tevatron.