Probing flavor-changing top-charm-scalar interactions in e(+)e(-) collisions

Because of the very large mass of the top quark, probing the flavor-changing top-charm-scalar vertex is clearly very important. Fortunately the largeness of m(t) endows a unique signature to the resulting reaction, i.e., e(+)e(-) --> <t(c)over bar>(<(t)over bar c>),that should be helpful in identification of such events. A two Higgs doublet model, without natural flavor conservation, is used to give an illustrative estimate for the rate for these reactions.