B->V gamma Beyond QCD Factorisation

Abstract

We calculate the main observables in $B_{u,d}\to (\rho ,\omega ,K^{\ast })\gamma$ and $B_s\to ({\bar{K}}^{\ast },\varphi )\gamma$ decays, i.e. branching ratios and CP and isospin asymmetries. We include QCD factorisation results and also the dominant contributions beyond QCD factorisation, namely long-distance photon emission and soft-gluon emission from quark loops. All contributions beyond QCD factorisation are estimated from light-cone sum rules. We devise in particular a method for calculating soft-gluon emission, building on earlier ideas developed for analogous contributions in non-leptonic decays. Our results are relevant for new-physics searches at the $B$ factories, the LHC and a future super-flavour factory. Using current experimental data, we also extract $|V_{td}/V_{ts}|$ and the angle $\gamma$ of the unitarity triangle. We give detailed tables of theoretical uncertainties of the relevant quantities which facilitates future determinations of these CKM parameters from updated experimental results.

49 pages, version to appear in PRD

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• Exploiting the width difference in B_s -> phi gamma
• Towards $B\to V\gamma$ Decays at NNLO in SCET
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• Tree-level contributions to the rare decays B+ --> pi+ nu anti-nu, B+ --> K+ nu anti-nu, and B+ --> K*+ nu anti-nu in the Standard Model
• Analysis of the vertices D^*D^* P, D^*D V and DDV with light-cone QCD sum rules
• B- -> pi- pi0/rho- rho0 to NNLO in QCD factorization
• New constraints on supersymmetric models from b -> s gamma
• Analysis of the vertices $DDV$ and $D^{\ast }DV$ with light-cone QCD sum rules
• Observation of B_s to phi gamma and Search for B_s to gamma gamma Decays at Belle
• The Higgs Decay Width in Multi-Scalar Doublet Models
• Systematic Study on QCD Interactions of Heavy Mesons with $\rho$ Meson
• Analysis of the vertex $D^{\ast }{D}^{\ast }\rho$ with the light-cone QCD sum rules
• B -> phi K*, B -> phi Ks and New Physics
• Theory Review of Exclusive Rare Radiative Decays
• Radiative penguin Bs decays at Belle
• Recent developments in radiative B decays
• |V_td/V_ts| from QCD Sum Rules on the Light-Cone
• Constraints on New Physics from gamma and |V_ub|