Complete (O_7,O_8) contribution to B -> X_s gamma at order alpha_s^2

Abstract

We calculate the set of O(alpha_s^2) corrections to the branching ratio and to the photon energy spectrum of the decay process B -> X_s gamma originating from the interference of diagrams involving the electromagnetic dipole operator O_7 with diagrams involving the chromomagnetic dipole operator O_8. The corrections evaluated here are one of the elements needed to complete the calculations of the B -> X_s gamma branching ratio at next-to-next-to-leading order in QCD. We conclude that this set of corrections does not change the central value of the Standard Model prediction for Br(B -> X_s gamma) by more than 1 %.

19 pages, 8 figures

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• Normalizing inclusive rare B decays
• Fermionic corrections to the interference of the electro- and chromomagnetic dipole operators in anti-B --> X(s) gamma at O(alpha(s)**2)
• Power suppressed effects in B-> X_s gamma at O(alpha_s)
• B Meson Decays
• QCD Corrections to the Radiative Decay B -> X_s gamma

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• Updated NNLO QCD predictions for the weak radiative B-meson decays
• Weak Radiative Decays of the B Meson and Bounds on $M_{H^{\pm }}$ in the Two-Higgs-Doublet Model
• Rare $B$ Decays as Tests of the Standard Model
• Prospects for charged Higgs searches at the LHC
• Radiative Corrections in Precision Electroweak Physics: a Historical Perspective
• Constraining top-quark couplings combining top-quark and $\mathbf{B}$ decay observables
• Completing the Calculation of BLM corrections to B -> Xs gamma
• Chromomagnetic Dipole-Operator Corrections in Bbar -> X_sgamma at O(beta_0 alpha_s^2)
• Precision Global Determination of the $B\to X_s\gamma$ Decay Rate
• Master Integrals for double real radiation emission in heavy-to-light quark decay
• A Search for pair production of the LSP $\widetilde{{\nu }_{\tau }}$ at the CLIC via RPV Decays