Abstract
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 χc0→π+π− decay. The corresponding amplitude for exclusive double-diffractive χc0 meson production was obtained within the kt-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 χc0 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¯)χc0 process including the absorptive corrections. The influence of kinematical cuts on the signal-to-background ratio is investigated. Corresponding experimental consequences are discussed.
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