  We evaluate differential distributions for exclusive scalar $f_0(1500)$ meson
(glueball candidate) production. Both QCD diffractive, pion-pion meson exchange
current (MEC) components as well as double-diffractive mechanism with
intermediate pionic loop are calculated. The pion-pion component, which can be
reliably calculated, dominates close to the threshold while the diffractive
component may take over only for larger energies. At the moment only upper
limit for the QCD-diffractive component can be obtained. The diffractive
component is calculated based on the Khoze-Martin-Ryskin approach proposed for
diffractive Higgs boson production. Different unintegrated gluon distribution
functions (UGDFs) from the literature are used. Rather large cross sections
(due to pion-pion fusion) are predicted for PANDA energies, where the gluonic
mechanism is shown to be negligible.
