Bs→f0(980) form factors and Bs decays into f0(980)

We compute the Bs→f0(980) transition form factors using light-cone QCD sum rules at leading order in the strong coupling constant, and also including an estimate of next-to-leading order corrections. We use the results to predict the branching fractions of the rare decay modes Bs→f0l+l- and Bs→f0νν, which turn out to be O(10-7) (Bs→f0(980)l+l-, with l=e, μ), O(10-8) (Bs→f0(980)τ+τ-) and O(10-6) (Bs→f0(980)νν). We also predict the branching ratio of Bs→J/ψf0(980) decay under the factorization assumption, and discuss the role of this channel for the determination of the Bs mixing phase compared to the golden mode Bs→J/ψφ. As a last application, we consider Ds→f0 form factors, providing a determination of the branching ratio of Ds→f0e+νe.