Spectator interactions in B -> V gamma decays and QCD factorisation

Abstract

We study the radiative decays B -> V gamma (where V=rho, K^*) in the framework of QCD factorisation, and in particular the hard-spectator contributions to the decay amplitudes. For the phenomenologically significant chromomagnetic operator, we show by an explicit next-to-leading-order computation that the spectator interactions factorise in the heavy-quark limit, i.e. that they can be written as the convolution of a hard-scattering kernel, computable in perturbation theory, and of the light-cone distribution amplitudes for the B and V mesons which contain the soft physics. The presence of an intermediate scale of order sqrt{Lambda_QCD M_B} leads to the presence of Sudakov logarithms. We indicate how the proof of factorisation can be extended to other (four-quark) operators.

40 pages, 18 figures

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Cited by in corpus (15)

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• Exclusive radiative and electroweak b->d and b->s penguin decays at NLO
• Heavy-to-light B meson form factors at large recoil energy -- spectator-scattering corrections
• Radiative and Electroweak Penguin Decays of B Mesons
• New Physics at a Super Flavor Factory
• Towards $B\to V\gamma$ Decays at NNLO in SCET
• Factorization in B->V gamma Decays
• Implication of the $B\to (\rho ,\omega )\gamma$ Branching Ratios for the CKM Phenomenology
• The CP asymmetry in B^0(t) -> K_S π^0 γin the Standard Model
• Deep inelastic scattering near the endpoint in soft-collinear effective theory
• Quark mass effects in the soft-collinear effective theory and B -> X_s + photon in the endpoint region
• Three-particle contributions to the renormalisation of B-meson light-cone distribution amplitudes
• Branching Ratio and CP-asymmetry for B-> 1^{1}P_{1}gamma decays
• Radiative $B$ to axial-vector meson decays at NLO in Soft-Collinear Effective Theory
• Radiative B to tensor meson decays at NLO in SCET