Exclusive production of chi(c)(0(+)) meson and its measurement in the pi(+)pi(-) channel

• We report on the results of a theoretical study of the central exclusive production of scalar chi(c)(0(+)) meson via chi(c0) -> 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 -> 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((p) over bar) -> pp((p) over bar)chi(c0) process, including the absorptive corrections, were calculated. The influence of kinematical cuts on the signal-to-background ratio is investigated.

Ämnesord

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Nyckelord

chi(c)(0(+)) -> pi(+)pi(-) decay

diffractive processes

two-pion continuum

χ (0 )→π π decay

Diffractive processes

Two-pion continuum

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