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

Exclusive production of \chi_{c}(0^{+}) meson and its measurement in the \pi^{+}\pi^{-} channel