Paper detail

Exclusive production of χ_{c}(0^{+}) meson and its measurement in the π^{+}π^{-} channel

We report on the results of a theoretical study of the central exclusive production of scalar $χ_{c}(0^{+})$ meson via $χ_{c0} \to π^{+}π^{-}$ decay in high-energy hadron collisions at the RHIC, Tevatron and LHC. The corresponding amplitude for exclusive double-diffractive $χ_{c0}$ meson production was obtained within the $k_{t}$-factorization approach including virtualities of active gluons and the cross section is calculated with unintegrated gluon distribution functions (UGDFs) known from the literature. The four-body $p p \to p p π^+ π^-$ reaction constitutes an irreducible background to the exclusive $χ_{c0}$ meson production. We include the absorption effects due to proton-proton interaction and pion-pion rescattering. Several differential distributions for $pp(\bar{p}) \to pp(\bar{p})χ_{c0}$ process, including the absorptive corrections, were calculated. The influence of kinematical cuts on the signal-to-background ratio is investigated.