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

Abstract

Interference between the photonic dipole operator Q_7 and the current-current operators 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 been known in the heavy charm quark limit only (m_c >> m_b/2). Here, we evaluate this 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 Standard Model reads B^SM_{s gamma} = (3.36 +_ 0.23) * 10^-4 for E_gamma > 1.6 GeV.

38 pages, 7 figures, 3 tables

References in corpus (10)

• Quark and gluon form factors to three loops
• Physics at Super B Factory
• HypExp 2, Expanding Hypergeometric Functions about Half-Integer Parameters
• Current status of the Standard Model CKM fit and constraints on $\Delta F=2$ New Physics
• Mass effects in muon and semileptonic b -> c decays
• NNLO fermionic corrections to the charm quark mass dependent matrix elements in B -> X_s gamma
• Measurement of the $\bar{B}\to X_s\gamma$ Branching Fraction with a Sum of Exclusive Decays
• Fermionic corrections to the interference of the electro- and chromomagnetic dipole operators in anti-B --> X(s) gamma at O(alpha(s)**2)
• 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)

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• Top quark effective couplings from top-pair tagged photoproduction in $p{e}^{-}$ collisions
• On charm-mass dependent NNLO corrections to B -> Xs gamma