B → V ℓ + ℓ − in the Standard Model from light-cone sum rules

We present b q → ρ, b q → ω, b q → k ∗, b s → k ∗ and b s → ϕ form factors from light-cone sum rules (lcsr) at $$ mathcal{o}left({alpha}_sright) $$ for twist-2 and 3 and $$ mathcal{o}left({alpha}_s^0right) $$ for twist-4 with updated hadronic input parameters. three asymptotic light-cone distribution amplitudes of twist-4 (and 5) are determined, necessary for the form factors to obey the equations of motion. it is argued that the latter constrain the uncertainty of tensor-to-vector form factor ratios thereby improving the prediction of zeros of helicity amplitudes of major importance for b → k ∗ℓℓ angular observables. we provide easy-to-use fits to the lcsr results, including the full error correlation matrix, in all modes at low q 2 as well as combined fits to lcsr and lattice results covering the entire kinematic range for b q → k ∗, b s → k ∗ and b s → ϕ. the error correlation matrix avoids the problem of overestimating the uncertainty in phenomenological applications. using the new form factors and recent computations of non-factorisable contributions we provide standard model predictions for b → k ∗γ as well as b → k ∗ℓ+ℓ− and b s → ϕμ + μ − at low dilepton invariant mass. employing our b → (ρ,ω) form factor results we extract the ckm element |v ub| from the semileptonic decays b → (ρ, ω)ℓν and find good agreement with other exclusive determinations.