Extracting Vus from Lattice QCD simulations: Recent progress and prospects

I review the current status of the determination of Vus from a lattice perspective. The recent progress are very impressive: computation with 2 + 1 and 2 + 1 + 1 dynamical flavours, physical pion mass, several fine lattices, different discretisation of the QCD Lagrangian, etc. In this report, intended for non-lattice experts, I give an overview of the situation for the computation of fK /fπ and f+(0), from which Vus and Vud can be extracted. Besides the main features of the new computations, I also present some theoretical ideas developed in the recent years which allow for a cleaner determination of the relevant form factor f+ (0).

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