$K\toμ^+μ^-$ beyond the standard model

We analyze the New Physics sensitivity of a recently proposed method to measure the CP-violating ${\cal B}(K_S\toμ^+μ^-)_{\ell=0}$ decay rate using $K_S - K_L$ interference. We present our findings both in a model-independent EFT approach as well as within several simple NP scenarios. We discuss the relation with associated observables, most notably ${\cal B}(K_L\toπ^0ν\barν)$. We find that simple NP models can significantly enhance ${\cal B}(K_S\toμ^+μ^-)_{\ell=0}$, making this mode a very promising probe of physics beyond the standard model in the kaon sector.

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