Progress on $K_{\mathrm{L}}\to {\mu }^{+}{\mu }^{-}$ from Lattice QCD

Abstract

In this contribution, we present recent progress from the RBC/UKQCD collaboration on the first calculation of the long-distance two-photon contribution to the decay amplitude of a long-lived kaon into a pair of charged muons.

Presented at the 12th Workshop on the CKM Unitarity Triangle, 18-22 September 2023, Santiago de Compostela