Branching fractions, polarisation and asymmetries of B -> VV decays

Abstract

We calculate the hard-scattering kernels relevant to the negative-helicity decay amplitude in B decays to two vector mesons in the framework of QCD factorisation. We then perform a comprehensive analysis of the 34 B->VV decays, including B_s decays and the complete set of polarisation observables. We find considerable uncertainties from weak annihilation and the non-factorisation of spectator-scattering. Large longitudinal polarisation is expected with certainty only for a few tree-dominated colour-allowed modes, which receive small penguin and spectator-scattering contributions. This allows for an accurate determination of the CKM angle alpha (or gamma) from S_L(rhorho) resulting in alpha=(85.6^{+7.4}_{-7.3}) degrees. We also emphasize that the rho K* system is ideal for an investigation of electroweak penguin effects.

39 pages, v2: matches published version

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• |V_ub| from UTangles and B->pi l nu
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• Role of electromagnetic dipole operator in the electroweak penguin dominated vector meson decays of $B$ meson
• A Search for Charmless $B\to VV$ Decays
• B Meson Decays to mega K*, omega rho, omega omega, omega phi, and omega f0

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