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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• The photon polarization in B -> X gamma in the standard model
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• Strange quark mass from e+e- revisited and present status of light quark masses
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• Factorization in B->V gamma Decays
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• Annihilation Type Radiative Decays of $B$ Meson in Perturbative QCD Approach
• Form Factors of ${\gamma }^{\ast }\rho \to \pi$ and ${\gamma }^{\ast }\gamma \to {\pi }^0$ Transitions and Light-Cone Sum Rules
• b -> s gamma in the left-right supersymmetric model
• CP Asymmetries in Radiative B Decays with R-parity Violation
• Exclusive Radiative Decays of B Mesons in QCD Factorization
• Heavy flavor physics from lattice QCD
• Photon polarization with anomalous right-handed top couplings in $B\to K_{res}\gamma$
• Lattice computation of the strange quark mass in QCD
• Impact of Right-handed Strange-beauty Squark on b <-> s Transitions

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