We calculate the contributions of the neutral top-pion, predicted by
topcolor-assisted technicolor (TC2) theory, to top-charm production via the
processes γγ⟶tˉc and e+e−⟶γγ⟶tˉc at the high energy linear e+e−
collider (LC) experiments. The cross section is of order 10−2pb in most of
the parameter space of TC2 theory, which may be detected at the LC experiments.
So the process e+e−⟶tˉc can be used to detect the
signature of TC2 theory.Comment: Latex file, 8 pages with 4 eps figures. to be published Phys.Lett.