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Heavy Higgs boson production and decay via<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">−</mml:mi></mml:mrow></mml:msup></mml:…
The complete matrix element for ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}bb\ifmmode\bar\else\textasciimacron\fi{}ZZ has been computed at tree level and applied to ${\mathit{ZH}}^{0}$ production followed by Z\ensuremath{\rightarrow}bb\ifmmode\bar\else\textasciimacron\fi{} and ${\mathit{H}}^{0}$\ensuremath{\rightarrow}ZZ, including all the irreducible background, at the Next Linear Collider. We find that, assuming flavor identification of the Z-decay products, this channel, together with ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}bb\ifmmode\bar\else\textasciimacron\fi{}${\mathit{W}}^{+}$${\mathit{W}}^{\mathrm{\ensuremath{-}}}$ in which ${\mathit{ZH}}^{0}$\ensuremath{\rightarrow}(bb\ifmmode\bar\else\textasciimacron\fi{})(${\mathit{W}}^{+}$${\mathit{W}}^{\mathrm{\ensuremath{-}}}$), …