  We investigate one-loop weak corrections to the production cross section of
two $b$-jets at Tevatron and Large Hadron Collider (LHC). We establish that
they are small at inclusive level but dominant in exclusive observables that
have a non-trivial dependence on the helicity structure of the hard
subprocesses. Such effects can serve as a test of the Standard Model (SM) and,
conversely, they should be taken into account in future experimental analyses
aiming at extracting possible signals of new physics.
