Mass Effects in $Wb\bar b$ Production at Hadron Colliders

We present the NLO QCD corrections to the process $p{\bar p},pp\rightarrow Wb\bar b$ including full mass effects. We study in detail the impact of mass terms in the theoretical prediction of cross sections and distributions. The $Wb\bar b$ mode is an important background for several processes, in particular for the associated W production of a SM light Higgs.