The ATLAS B-physics Program

The large b quark production cross-section at the LHC will allow sensitive tests of possible new physics contributions. The ATLAS B-physics program includes the new physics search, such as measurement of the CP violating phase ϕs of the system, searching for anomalous rates of the rare B-decay channel: , as well as precise tests of QCD by studying of the production mechanisms of pairs, beauty baryon polarization, and lifetime measurement in the earlier stage of the data taking. The strategy of ATLAS for B-physics strongly depends on the ATLAS trigger system decision which will be different in the different luminosity periods. This article gives an overview of ATLAS B-physics studies for low and high luminosity periods, including description of ATLAS trigger with an emphasis on the B-physics selections.