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The complete matrix elements for $e^+e^-\to b\bar bW^\pm H^\mp$ and$e^+e^-\to b\bar bH^+H^-$ are computed at tree-level within the MinimalSupersymmetric Standard Model. Rates of interest to phenomenological analysesat the Next Linear Collider are given. In particular, we analyse: (i) $t\bar t$pair production followed by the top decays into $b\bar bW^\pm H^\mp$ and $b\barb H^+H^-$ final states; (ii) $H^+H^-$ signals in which $H^\pm\to h W^\pm \tob\bar b W^\pm$ and $H^\pm\to tb\to b\bar b W^\pm$. Top and Higgs finite widtheffects are included as well as all those due to the irreducible backgrounds.

european physical journal. c, particles and fields

The processes $e^+e^-\rightarrow b\bar bW^\pm H^\mp$ and $e^+e^-\rightarrow b\bar bH^+H^-$ at the next linear collider in the minimal supersymmetric standard model