Charm and beauty physics at ATLAS

ATLAS has a rich charmonium and beauty physics programme. After a few pb^-1 of 7TeV collision data have been taken at the LHC, ATLAS will be able to start probing the new energy regime with decays of the psi and Upsilon families of mesons into pairs of muons. The very first measurements, possible with only a pb^-1 of data, will include the fraction of J/psi mesons produced in B-hadron decays, the average lifetime of B-hadrons decaying via J/psi, and the differential J/psi production cross section. Crucial to all of these measurements are the performance of the muon triggers and the offline muon reconstruction and identification, as well as the inner detector performance and tracking. We will review the performance of these elements with respect to the LHC data taken thus far, and present the prospects for the early onia to di-muon measurements.