Like Sign Top Quark Pair Production at Linear Colliders

Abstract

In the general two Higgs doublet model with flavor changing neutral Higgs couplings, neutral Higgs bosons may decay dominantly via $t\bar{c}$ or $\bar{t}c$ final states. At the linear collider, $e^{+}{e}^{-}\to h^0{A}^0$ or $H^0{A}^0$ production processes may result in $b\bar{b}t\bar{c}$, $W^{+}{W}^{-}t\bar{c}$ or $tt\bar{c}\bar{c}$ (or $\bar{t}\bar{t}cc$) final states. The process ${\hat{I}}^3{\hat{I}}^3\to h^0,A^0\to t\bar{c}$ is also promising, but $e^{+}{e}^{-}\to (h^0,H^0)Z^0\to t\bar{c}{Z}^0$ is relatively suppressed. The possibility of observing like sign lepton pairs, usually the hallmark for neutral meson mixing, is quite interesting since $T^0$ mesons do not even form.

13 pages, REVTEX, 2 figures (not included)