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News on $B\to K^{(*)}ν\barν$ in the Standard Model and beyond

An analysis of the rare B decays $B\to K^{(*)}ν\barν$ is presented both within the SM and beyond. The SM predictions for the branching ratios are updated and uncertainties reduced. For the NP analysis both a model independent approach is used and concrete NP models are studied. The relations between $b\to sν\barν$ and $b\to s\ell^+\ell^-$ transitions are analysed in detail.