We present total and differential cross sections for the production of a hard
photon with up to two b jets at both the Tevatron with center-of-mass energy
1.96 TeV and the Large Hadron Collider with center-of-mass energy 8 TeV,
including Next-to-Leading Order (NLO) QCD corrections and full b-quark mass
effects. We study the theoretical uncertainty due to the residual
renormalization- and factorization-scale dependence and explain its origin on
the basis of the different subprocesses contributing to the NLO cross section.
We specifically address the case of the production of a hard photon with at
least one b jet and compare the NLO QCD predictions in both the Four- and
Five-Flavor-Number Schemes to the experimental measurements obtained by CDF and
D0.Comment: 33 pages, 50 postscript figure
