K → μ+μ− beyond the standard model

A bstract We analyze the New Physics sensitivity of a recently proposed method to measure CP-violating $$ \mathcal{B} B ( K S → μ + − ) ℓ =0 decay rate using L interference. present our findings both in model-independent EFT approach as well within several simple NP scenarios. discuss relation with associated observables, most notably π 0 \nu \overline{\nu} ν ¯ ). find that models can significantly enhance , making this mode very promising probe physics beyond standard model kaon sector.