Constraints on a scalar-pseudoscalar Higgs mixing at future e ¿ e ¿ colliders: An update

We perform an update of our previous analysis of the constraints on possible deviations of $\mathrm{Hb}\overline{b}$ coupling parametrized as ${(m}_{b}/v)(a+i{\ensuremath{\gamma}}_{5}b),$ arising from a scalar-pseudoscalar mixing, where the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}b\overline{b}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ was used. In this paper we include a complete simulation of the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}b\overline{b}{e}^{+}{e}^{\ensuremath{-}}$ and combine these results to obtain tighter bounds on the deviations of the parameters a and b from their standard model values that could be measured at the Next Linear Collider.