$K_{\mathrm{L}}\to {\mu }^{+}{\mu }^{-}$ from lattice QCD

En-Hung Chao, Norman H. Christ, Xu Feng +1

We propose a lattice-QCD-suitable framework for computing the two-photon long-distance contribution to the complex $K_{\mathrm{L}}\to {\mu }^{+}{\mu }^{-}$ decay amplitude, where QED is treate…