B-physics potential of ATLAS and CMS experimens.

LHC experiments ATLAS and CMS are preparing a multi thematic beauty physics program that will cover both B hadron decays and their production. After an introduction outlining the physics conditions of the two experiments and the event selection strategies, we give the current status of studies made for precision measurements in B-decays. First, we concentrate on physics of Cabibbo favoured decays of Bd0 and Bs0 mesons, dominated by the interest in the CP violation mechanisms. There follows the part devoted to the rare B-decays potential. Finally we present the program for beauty production measurements that will allow to test QCD in LHC central p-p collisions