  Different from other multiple top-quark productions, triple top-quark
production requires the presence of both flavor violating neutral interaction
and flavor conserving neutral interaction. We describe the interaction of
triple top-quarks and up-quark in terms of two dimension-6 operators; one can
be induced by a new heavy vector resonance, the other by a scalar resonance.
Combining same-sign top-quark pair production and four top-quark production, we
explore the potential of the 13 TeV LHC on searching for the triple top-quark
production.
