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

Abstract

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

Comments: 4 pages, 6 figures, talk by P.Lebiedowicz at the 5th International Hadron Structure'11 Conference, Tatranská Štrba, Slovakia, June 27th - July 1st, 2011