Energy Spectrum of Secondary Leptons in $e^{+}{e}^{-}\to t\bar{t}$ - Non-standard Interactions and CP Violation -

Abstract

The process of top-quark pair production at future high-energy $e^{+}{e}^{-}$ linear colliders has been investigated as a possible test of physics beyond the Standard Model. Non-standard interactions have been assumed both for the production and for the subsequent decay of the top quarks. The energy spectrum of the single lepton $l^{\pm }$ and the energy correlation of $l^{+}$ and $l^{-}$ emerging from the process $e^{+}{e}^{-}\to t\bar{t}\to l^{\pm }X/l^{+}{l}^{-}X$ are calculated. The energy- spectrum asymmetry of $l^{+}$ and $l^{-}$ is considered as a measure of CP violation. An optimal method to determine whether CP violation occurs in the production or in the decay processes is proposed.

Comments: Final version (to appear in Nucl.Phys.B)