Probing flavor changing interactions in hadron collisions

The subprocess gg-->t (c) over bar (t) over bar c in the two-Higgs-doublet model with flavor-changing scalar couplings is examined at the one loop level. With the perturbative QCD factorization theorem, the corresponding cross sections for hadron-hadron collisions are computed numerically. The results are applicable to the whole mass range of the weakly coupled Higgs bosons. In case we could efficiently exclude the severe backgrounds of the t (c) over bar((t) over bar c) production signal, probing the flavor-changing top-charm-scalar vertex at hadron colliders would be very promising and accessible experimentally.