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Exlusive charmed meson pair production
The experimental data of BELLE Collaboration on the exclusive charmed meson
pair production in the process of monophotonic -annihilation
() has been studied. It has been shown that
these data is described satisfactorily in the frame work of constituent quark
model. Our studies have demonstrated that the central production process
and the process of
monophotonic -annihilation yield comparable numbers of the charmed
meson pairs.Comment: 15 pages, 7 figures, RevTeX
The Color-Octet Contributions to -wave Meson Hadroproduction
The contributions from the color-octet components and to the or
(the -wave meson) hadroproduction are estimated in
terms of the complete calculation. As necessary inputs
in the estimate, we take the values of the octet matrix elements according to
the NRQCD scaling rules, and as a result, we have found that the contributions
to the -wave production may be the same in order of magnitude as those from
the color-singlet ones, and (). Especially, our result indicates that the
observation of the color-octet contributions to the -wave production in the
low transverse momentum region is not very far from the present experimental
capability at Tevatron and LHC.Comment: 14 pages, 4 figures (8 eps-files for figures), add references and
correct typo
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