CP violation in the semileptonic top decay in two-Higgs doublet model

Abstract

CP violation in semileptonic top-quark decay is investigated by exactly using one charged- and three neutral-Higgs bosons obtained by solving the Higgs mass matrix in two-Higgs doublet model. The CP-violating up-down asymmetry of leptons from $W$ boson decays is shown to be $1\times 10^{-4}-4\times 10^{-3}$ for the region of $\tan \beta \ll 1$, where $\tan \beta$ is the ratio of vacuum expectation values for the two neutral Higgs bosons.

Comments: 9 pages in LaTeX. 1 figure drawn in LaTeX and 8 eps figures. Improvements of the figures