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Interference between the photonic dipole operator Q_7 and the current-currentoperators Q_{1,2} gives one of the most important QCD corrections to the B ->X_s gamma decay rate. So far, the O(alpha_s^2) part of this correction has beenknown in the heavy charm quark limit only (m_c >> m_b/2). Here, we evaluatethis part at m_c=0, and use both limits in an updated phenomenological study.Our prediction for the CP- and isospin-averaged branching ratio in the StandardModel reads B^SM_{s gamma} = (3.36 +_ 0.23) * 10^-4 for E_gamma > 1.6 GeV.

The (Q_7,Q_{1,2}) contribution to B -> X_s gamma at O(alpha_s^2)