K → μ + μ − beyond the standard model

Abstract We analyze the New Physics sensitivity of a recently proposed method to measure the CP-violating B $$ \mathcal{B} $$ (K S → μ + μ − ) ℓ=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 B $$ \mathcal{B} $$ (K L → π 0 ν ν ¯ $$ \nu \overline{\nu} $$ ). We find that simple NP models can significantly enhance B $$ \mathcal{B} $$ (K S → μ + μ − ) ℓ=0, making this mode a very promising probe of physics beyond the standard model in the kaon sector.

Abstract licence: CC BY

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