Abstract
We consider the production of baryons containing two heavy quarks via gluon-gluon, photon-gluon, and photon-photon fusion processes in the framework of the nonrelativistic heavy quark model and perturbative chromodynamics. We calculate the corresponding cross sections for $\mathrm{pp}$, $\mathrm{ep}$, and $\ensuremath{\gamma}\ensuremath{\gamma}$ collisions at the energies of present and future colliders and analyze the uncertainties of theoretical estimations.
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