Measurement of exclusive production of scalar Χ_c0 meson in proton-(anti)proton collisions via π_c0→π⁺π^- decay

Summary, in English

We consider a measurement of exclusive production of scalar Χc(0⁺⁺) meson in the proton-proton collisions at LHC and RHIC and in the proton-antiproton collisions at the Tevatron via Χ_c0→π⁺π^- decay. 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 corresponding cross section is calculated with unintegrated gluon distribution functions (UGDFs) known from the literature. The four-body pp→ppπ⁺π^- reaction constitutes an irreducible background to the exclusive Χ_c0 meson production. We include absorption effects due to proton-proton interaction and pion-pion rescattering. We calculate several differential distributions for pp(p)→pp(p)Χ_c0 process including the absorptive corrections. The influence of kinematical cuts on the signal-to-background ratio is investigated. Corresponding experimental consequences are discussed.