$O(\alpha_s)$ Corrections to $b \bar b \to W^{\pm}H^{\mp}$ at the CERN Large Hadron Collider

The $O(\alpha_{s})$ corrections to the cross section for $b \bar b \to W^{\pm}H^{\mp}$ at the LHC are calculated in the minimal supersymmetric standard model (MSSM) in the $\bar{MS}$ and OS (on-mass-shell) renormalization schemes. The results in two schemes are in good agreement. In the $\bar{MS}$ scheme, the QCD corrections can enhance the cross sections within 20% and 40%, for charged Higgs boson mass between 130 and 1000 GeV and for $\tan\beta$ between 2 and 50.