QCD color interactions between two quarks

We study the QCD color interactions between static two heavy quarks at zero temperature in a quenched SU(3) lattice gauge simulation: in addition to the standard singlet q (q) over bar potentials, we calculate octet q (q) over bar potentials, symmetric and antisymmetric qq potentials. It is shown that the antisymmetric qq channel behaves as a linearly rising potential at large quark separations. We further find that the q (q) over bar octet and qq symmetric channels have the complex dependence on the distance; at short distances they are repulsive forces, while at large distances, they show linearly rising feature. Ratio of string tensions between qq singlet and qq antisymmetric potentials is described in terms of the Casimir factor. (c) 2005 Elsevier B.V. All rights reserved.