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In the Minimal Supersymmetric Standard Model, the masses of the charged Higgsboson ($H^\pm$) and the CP-odd scalar ($A$) are related by$M_{H^+}^2=M_A^2+m_W^2$ at the Born level. Because the coupling of$W^-$-$A$-$H^+$ is fixed by gauge interaction, the Born level production rateof $q \bar q' \to W^{\pm \ast} \to A H^\pm$ depends only on one supersymmetryparameter -- the mass ($M_A^{}$) of $A$. We examine the sensitivity of the LHCto this signal event in the $A(\ra b {\bar b})H^+(\ra \tau^+ \nu_\tau)$ and$A(\ra b {\bar b})H^+(\ra t {\bar b})$ decay channels. We illustrate how totest the mass relation between $A$ and $H^+$ in case that the signal is found.If the signal is not found, the product of the decay branching ratios of $A$and $H^\pm$ predicted by the MSSM is bounded from above as a function of $M_A$.Comment: Version published in Physical Review D (minor refinements, references  added, RevTex4, 47 pages, 13 figures

Associated production ofCP-odd and charged Higgs bosons at hadron colliders