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

In the minimal supersymmetric standard model (MSSM), the masses of the charged Higgs boson (H^±) and the CP-odd scalar (A) are related by M_H⁺²=MA²+mW² at the Born level. Because the coupling of W^--A-H⁺ is fixed by the gauge interaction, the Born level production rate of qq^'→W^±*→AH^± depends on only one supersymmetry parameter---the mass (MA) of A. We examine the sensitivity of the CERN LHC to this signal event in the A(→bb̄)H⁺(→τ⁺ν_τ) and A(→bb̄)H⁺(→tb̄) decay channels. We illustrate how to test the mass relation between A and H⁺ in case the signal is found. If the signal is not found, the product of the decay branching ratios of A and H^± predicted by the MSSM is bounded from above as a function of MA.