Abstract
Top flavour-changing neutral interactions with a light quark q=u,c and a
gauge or Higgs boson are very suppressed within the Standard Model (SM), but
can reach observable levels in many of its extensions. We review the possible
size of the effective vertices Ztq, gamma tq, gtq and Htq in several SM
extensions, and discuss the processes in which these interactions might show up
at LHC and at a high energy e+ e- linear collider.
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