Double top production at hadronic colliders

We calculate the contribution of anomalous top-quark interaction with a glu on, photon, and Z-boson (FCNC) to <(tt)over bar> pair production in hadroni c collisions. Using the current data from Run 1 of the Tevatron we evaluate the upper limit on the the anomalous coupling of t-quark with gluon, \kapp a(g)/Lambda\ less than or equal to 0.52 TeV-1. We examine the production of double top (tt or <(tt)over bar>) at hadronic colliders as a result of FCN C interactions of the top quark. It is shown that the study of such reactio ns at LHC collider makes it possible to obtain the constraint on strength o f coupling at the level of /kappa(g)/ Lambda\ less than or equal to 0.09 Te V-1. (C) 1999 Published by Elsevier Science B.V. All rights reserved.