Theoretical predictions for b→ s μ⁺ μ⁻ decays

I review the state of the art of the theoretical calculations for decays mediated by b→ s ⁺ ⁻ transitions, for =e,μ. I focus on the predictions of observables in B→ K μ⁺μ⁻, B→ K^* μ⁺μ⁻, and Bₛ→ φ μ⁺μ⁻ decays, as many of these predictions are in tension with the corresponding experimental measurements. I also briefly discuss the Λb→ Λ μ⁺μ⁻ decay and present a new calculation for this channel. Special emphasis is placed on the non-local contributions, as they are the largest systematic uncertainties in these decays. The current theoretical calculations for b→ s μ⁺ μ⁻ decays are not able to explain the tensions with the experimental measurements.