PAIR PRODUCTION OF CHI(C) STATES AT COLLIDER ENERGIES

In perturbative QCD used together with the nonrelativistic bound-state formalism, the production of chi(c) pairs in pp, ep, and gamma gamma collisions is considered at energies of present and future colliders. A variety of partonic subprocesses, including those governed by the co lor-singlet and color-octet mechanisms, are taken into account. Region s in the phase space where each of the partonic subprocesses contribut es most significantly are found from analysis of energy and angular di stributions. The role of beam polarization is also discussed.