We consider a measurement of exclusive production of scalar $\chi_{ c}(0^{ ++})$ meson in the proton-proton collisions at LHC and RHIC and in the proton-antiproton collisions at the Tevatron via $\chi_{ c0} \to \pi^{ +}\pi^{ -}$ decay. The corresponding amplitude for exclusive double-diffractive $\chi_{ c0}$ meson production was obtained within the $k_{ t}$-factorization approach including virtualities of active gluons and the corresponding cross section is calculated with unintegrated gluon distribution functions (UGDFs) known from the literature. The four-body $p p \to p p \pi^+ \pi^-$ reaction constitutes an irreducible background to the exclusive $\chi_{ c0}$ meson production. We calculate several differential distributions for $pp(\bar{ p}) \to pp(\bar{ p})\chi_{ c0}$ process including absorptive corrections. The influence of kinematical cuts on the signal-to-background ratio is investigated. Corresponding experimental consequences are discussed.
Categories: hep-ph