  The b-hadron production cross section is measured with the ATLAS detector in
pp collisions at sqrt(s) = 7 TeV, using 3.3 pb^-1 of integrated luminosity,
collected during the 2010 LHC run. The b-hadrons are selected by partially
reconstructing D*muX final states. Differential cross sections are measured as
functions of the transverse momentum and pseudorapidity. The measured
production cross section for a b-hadron with pT>9 GeV and |eta|<2.5 is 32.7 pm
0.8 (stat) ^{+4.5}_{-6.8} (syst) ub, higher than the next-to-leading-order QCD
predictions but consistent within the experimental and theoretical
uncertainties.
